Article

Jennifer Guerriero, PhD, from Brigham and Women's Hospital in Boston, Massachusetts, shares highlights in breast cancer from the 37th Annual Meeting of the Society for Immunotherapy of Cancer. 

She begins with a study of the tumor microenvironment that found a range of MHC-1 expression across breast cancer subtypes. Crucially, expression appears to affect the local immune landscape and response to immunotherapy. 

Next, she looks at a study that showed that the tyrosine kinase Ron affects T-cell recruitment into sites of metastatic breast cancer, offering a potential therapeutic target via Ron kinase inhibitors. 

Dr Guerriero moves on to a study exploring tumor antigen-specific antibody responses in patients with metastatic triple-negative breast cancer patients and their association with immunotherapy outcomes. 

This is followed by a phase 1/2 trial in which an in situ anti-cancer vaccine was created with a combination of four treatments, achieving responses in heavily pretreated patients. 

Dr Guerriero ends with a series of posters on CT-0508, a novel anti-HER2 chimeric antigen receptor macrophage therapy, that showed encouraging activity in targeting HER2 overexpressing tumors. 

--

Assistant Professor, Department of Surgery, Division of Breast Surgery, Brigham and Women's Hospital, Boston, Massachusetts 

Jennifer L. Guerriero, PhD, has disclosed the following relevant financial relationships: 

Serve(d) as a director, officer, partner, employee, advisor, consultant, or trustee for: Mersana; Duke St Bio; AstraZeneca; OncoOne 

Received research grant from: Merck 

Jennifer Guerriero, PhD, from Brigham and Women's Hospital in Boston, Massachusetts, shares highlights in breast cancer from the 37th Annual Meeting of the Society for Immunotherapy of Cancer. 

She begins with a study of the tumor microenvironment that found a range of MHC-1 expression across breast cancer subtypes. Crucially, expression appears to affect the local immune landscape and response to immunotherapy. 

Next, she looks at a study that showed that the tyrosine kinase Ron affects T-cell recruitment into sites of metastatic breast cancer, offering a potential therapeutic target via Ron kinase inhibitors. 

Dr Guerriero moves on to a study exploring tumor antigen-specific antibody responses in patients with metastatic triple-negative breast cancer patients and their association with immunotherapy outcomes. 

This is followed by a phase 1/2 trial in which an in situ anti-cancer vaccine was created with a combination of four treatments, achieving responses in heavily pretreated patients. 

Dr Guerriero ends with a series of posters on CT-0508, a novel anti-HER2 chimeric antigen receptor macrophage therapy, that showed encouraging activity in targeting HER2 overexpressing tumors. 

--

Assistant Professor, Department of Surgery, Division of Breast Surgery, Brigham and Women's Hospital, Boston, Massachusetts 

Jennifer L. Guerriero, PhD, has disclosed the following relevant financial relationships: 

Serve(d) as a director, officer, partner, employee, advisor, consultant, or trustee for: Mersana; Duke St Bio; AstraZeneca; OncoOne 

Received research grant from: Merck 

Jennifer Guerriero, PhD, from Brigham and Women's Hospital in Boston, Massachusetts, shares highlights in breast cancer from the 37th Annual Meeting of the Society for Immunotherapy of Cancer. 

She begins with a study of the tumor microenvironment that found a range of MHC-1 expression across breast cancer subtypes. Crucially, expression appears to affect the local immune landscape and response to immunotherapy. 

Next, she looks at a study that showed that the tyrosine kinase Ron affects T-cell recruitment into sites of metastatic breast cancer, offering a potential therapeutic target via Ron kinase inhibitors. 

Dr Guerriero moves on to a study exploring tumor antigen-specific antibody responses in patients with metastatic triple-negative breast cancer patients and their association with immunotherapy outcomes. 

This is followed by a phase 1/2 trial in which an in situ anti-cancer vaccine was created with a combination of four treatments, achieving responses in heavily pretreated patients. 

Dr Guerriero ends with a series of posters on CT-0508, a novel anti-HER2 chimeric antigen receptor macrophage therapy, that showed encouraging activity in targeting HER2 overexpressing tumors. 

--

Assistant Professor, Department of Surgery, Division of Breast Surgery, Brigham and Women's Hospital, Boston, Massachusetts 

Jennifer L. Guerriero, PhD, has disclosed the following relevant financial relationships: 

Serve(d) as a director, officer, partner, employee, advisor, consultant, or trustee for: Mersana; Duke St Bio; AstraZeneca; OncoOne 

Received research grant from: Merck 

Dr Jack West, from City of Hope Comprehensive Cancer Center, Duarte, California, gives his picks of noteworthy advances in non–small cell lung cancer (NSCLC) presented at the 37th Annual Meeting of the Society for Immunotherapy of Cancer. 

Dr West starts by discussing data from a real-world analysis of patients who had undergone next-generation sequencing and received a variety of treatments. This revealed that those with KRAS mutations, alongside STK11 and KEAP1 mutations, had worse outcomes. 

Next, he reports on a genomic study indicating that acquired resistance mechanisms affecting a range of genes were unique to immunotherapy and were not seen with chemotherapy or targeted therapies. 

Dr West moves on to KEYNOTE-495, which found that NSCLC patients with a favorable gene expression profile and low tumor mutational burden had the greatest response to combination therapy with pembrolizumab and lenvatinib. 

The LAG-3 inhibitor eftilagimod alpha in combination with pembrolizumab was examined in the next study, which showed that PD-L1 expression was related to response rates. 

Dr West closes by discussing a talk that made the case for neoadjuvant over adjuvant immunotherapy in lung cancer and other settings. 

--

Associate Professor, Department of Medical Oncology, City of Hope Comprehensive Cancer Center, Duarte, California; Vice President, Network Strategy, AccessHope, Los Angeles, California 

H. Jack West, MD, has disclosed the following relevant financial relationships: 

Serve(d) as a director, officer, partner, employee, advisor, consultant, or trustee for: Amgen; AstraZeneca; Genentech/Roche; Merck; Mirati; Regeneron; Takeda 

Serve(d) as a speaker or a member of a speakers bureau for: Amgen; AstraZeneca; Merck 

Dr Jack West, from City of Hope Comprehensive Cancer Center, Duarte, California, gives his picks of noteworthy advances in non–small cell lung cancer (NSCLC) presented at the 37th Annual Meeting of the Society for Immunotherapy of Cancer. 

Dr West starts by discussing data from a real-world analysis of patients who had undergone next-generation sequencing and received a variety of treatments. This revealed that those with KRAS mutations, alongside STK11 and KEAP1 mutations, had worse outcomes. 

Next, he reports on a genomic study indicating that acquired resistance mechanisms affecting a range of genes were unique to immunotherapy and were not seen with chemotherapy or targeted therapies. 

Dr West moves on to KEYNOTE-495, which found that NSCLC patients with a favorable gene expression profile and low tumor mutational burden had the greatest response to combination therapy with pembrolizumab and lenvatinib. 

The LAG-3 inhibitor eftilagimod alpha in combination with pembrolizumab was examined in the next study, which showed that PD-L1 expression was related to response rates. 

Dr West closes by discussing a talk that made the case for neoadjuvant over adjuvant immunotherapy in lung cancer and other settings. 

--

Associate Professor, Department of Medical Oncology, City of Hope Comprehensive Cancer Center, Duarte, California; Vice President, Network Strategy, AccessHope, Los Angeles, California 

H. Jack West, MD, has disclosed the following relevant financial relationships: 

Serve(d) as a director, officer, partner, employee, advisor, consultant, or trustee for: Amgen; AstraZeneca; Genentech/Roche; Merck; Mirati; Regeneron; Takeda 

Serve(d) as a speaker or a member of a speakers bureau for: Amgen; AstraZeneca; Merck 

Dr Jack West, from City of Hope Comprehensive Cancer Center, Duarte, California, gives his picks of noteworthy advances in non–small cell lung cancer (NSCLC) presented at the 37th Annual Meeting of the Society for Immunotherapy of Cancer. 

Dr West starts by discussing data from a real-world analysis of patients who had undergone next-generation sequencing and received a variety of treatments. This revealed that those with KRAS mutations, alongside STK11 and KEAP1 mutations, had worse outcomes. 

Next, he reports on a genomic study indicating that acquired resistance mechanisms affecting a range of genes were unique to immunotherapy and were not seen with chemotherapy or targeted therapies. 

Dr West moves on to KEYNOTE-495, which found that NSCLC patients with a favorable gene expression profile and low tumor mutational burden had the greatest response to combination therapy with pembrolizumab and lenvatinib. 

The LAG-3 inhibitor eftilagimod alpha in combination with pembrolizumab was examined in the next study, which showed that PD-L1 expression was related to response rates. 

Dr West closes by discussing a talk that made the case for neoadjuvant over adjuvant immunotherapy in lung cancer and other settings. 

--

Associate Professor, Department of Medical Oncology, City of Hope Comprehensive Cancer Center, Duarte, California; Vice President, Network Strategy, AccessHope, Los Angeles, California 

H. Jack West, MD, has disclosed the following relevant financial relationships: 

Serve(d) as a director, officer, partner, employee, advisor, consultant, or trustee for: Amgen; AstraZeneca; Genentech/Roche; Merck; Mirati; Regeneron; Takeda 

Serve(d) as a speaker or a member of a speakers bureau for: Amgen; AstraZeneca; Merck 

Reporting on highlights in axial spondyloarthritis (AxSpA) from the American College of Rheumatology Convergence 2022, Dr Philip Mease of Swedish Medical Center in Seattle calls attention to studies on promising therapeutic outcomes. 

He begins with the late-breaking long-range therapeutic results of bimekizumab, which was shown to be effective in patients with nonradiographic AxSpA and those with ankylosing spondylitis over 52 weeks. 

Next, he reports on a study examining withdrawal vs tapering of golimumab, which underscored the benefit of tapering in prevention of disease flares. 

Dr Mease then discusses a study in which cycling between tumor necrosis factor inhibitors provided disappointing results in the AxSpA population, suggesting that switching to a therapy with a different mechanism of action might achieve better outcomes. 

Another study cited by Dr Mease explored the use of combination therapy in patients with AxSpA, which yielded promising results. Should this approach take hold, Dr Mease says that in the future, "we'll be more like oncologists, mixing and matching and doing what's best for our patients to bring them into a state of remission." 

Dr Mease closes by discussing a large study investigating COVID among patients with autoimmune diseases, including AxSpA and psoriasis. The study found that neither the conditions themselves nor their treatments significantly increased risk for severe outcomes. 

--

Philip Mease, MD, Clinical Professor, University of Washington School of Medicine; Director, Department of Rheumatology Research, Swedish Medical Center/Providence St. Joseph's Health, Seattle Rheumatology Associates, Seattle, Washington 

Philip Mease, MD, has disclosed the following relevant financial relationships: 

Serve(d) as a director, officer, partner, employee, advisor, consultant, or trustee for: AbbVie; Acelyrin; Aclaris; Amgen; Boehringer Ingelheim; Bristol Myers Squibb; Eli Lilly; Galapagos; Gilead; GlaxoSmithKline; Inmagene; Janssen; MoonLake; Novartis; Pfizer; Sun Pharma; UCB 

Serve(d) as a speaker or a member of a speakers bureau for: AbbVie; Amgen; Eli Lilly; Janssen; Novartis; Pfizer; UCB 

Received research grant from: AbbVie; Amgen; Bristol Myers Squibb; Eli Lilly; Galapagos; Gilead; Janssen; Novartis; Pfizer; Sun Pharma; UCB 

Reporting on highlights in axial spondyloarthritis (AxSpA) from the American College of Rheumatology Convergence 2022, Dr Philip Mease of Swedish Medical Center in Seattle calls attention to studies on promising therapeutic outcomes. 

He begins with the late-breaking long-range therapeutic results of bimekizumab, which was shown to be effective in patients with nonradiographic AxSpA and those with ankylosing spondylitis over 52 weeks. 

Next, he reports on a study examining withdrawal vs tapering of golimumab, which underscored the benefit of tapering in prevention of disease flares. 

Dr Mease then discusses a study in which cycling between tumor necrosis factor inhibitors provided disappointing results in the AxSpA population, suggesting that switching to a therapy with a different mechanism of action might achieve better outcomes. 

Another study cited by Dr Mease explored the use of combination therapy in patients with AxSpA, which yielded promising results. Should this approach take hold, Dr Mease says that in the future, "we'll be more like oncologists, mixing and matching and doing what's best for our patients to bring them into a state of remission." 

Dr Mease closes by discussing a large study investigating COVID among patients with autoimmune diseases, including AxSpA and psoriasis. The study found that neither the conditions themselves nor their treatments significantly increased risk for severe outcomes. 

--

Philip Mease, MD, Clinical Professor, University of Washington School of Medicine; Director, Department of Rheumatology Research, Swedish Medical Center/Providence St. Joseph's Health, Seattle Rheumatology Associates, Seattle, Washington 

Philip Mease, MD, has disclosed the following relevant financial relationships: 

Serve(d) as a director, officer, partner, employee, advisor, consultant, or trustee for: AbbVie; Acelyrin; Aclaris; Amgen; Boehringer Ingelheim; Bristol Myers Squibb; Eli Lilly; Galapagos; Gilead; GlaxoSmithKline; Inmagene; Janssen; MoonLake; Novartis; Pfizer; Sun Pharma; UCB 

Serve(d) as a speaker or a member of a speakers bureau for: AbbVie; Amgen; Eli Lilly; Janssen; Novartis; Pfizer; UCB 

Received research grant from: AbbVie; Amgen; Bristol Myers Squibb; Eli Lilly; Galapagos; Gilead; Janssen; Novartis; Pfizer; Sun Pharma; UCB 

Reporting on highlights in axial spondyloarthritis (AxSpA) from the American College of Rheumatology Convergence 2022, Dr Philip Mease of Swedish Medical Center in Seattle calls attention to studies on promising therapeutic outcomes. 

He begins with the late-breaking long-range therapeutic results of bimekizumab, which was shown to be effective in patients with nonradiographic AxSpA and those with ankylosing spondylitis over 52 weeks. 

Next, he reports on a study examining withdrawal vs tapering of golimumab, which underscored the benefit of tapering in prevention of disease flares. 

Dr Mease then discusses a study in which cycling between tumor necrosis factor inhibitors provided disappointing results in the AxSpA population, suggesting that switching to a therapy with a different mechanism of action might achieve better outcomes. 

Another study cited by Dr Mease explored the use of combination therapy in patients with AxSpA, which yielded promising results. Should this approach take hold, Dr Mease says that in the future, "we'll be more like oncologists, mixing and matching and doing what's best for our patients to bring them into a state of remission." 

Dr Mease closes by discussing a large study investigating COVID among patients with autoimmune diseases, including AxSpA and psoriasis. The study found that neither the conditions themselves nor their treatments significantly increased risk for severe outcomes. 

--

Philip Mease, MD, Clinical Professor, University of Washington School of Medicine; Director, Department of Rheumatology Research, Swedish Medical Center/Providence St. Joseph's Health, Seattle Rheumatology Associates, Seattle, Washington 

Philip Mease, MD, has disclosed the following relevant financial relationships: 

Serve(d) as a director, officer, partner, employee, advisor, consultant, or trustee for: AbbVie; Acelyrin; Aclaris; Amgen; Boehringer Ingelheim; Bristol Myers Squibb; Eli Lilly; Galapagos; Gilead; GlaxoSmithKline; Inmagene; Janssen; MoonLake; Novartis; Pfizer; Sun Pharma; UCB 

Serve(d) as a speaker or a member of a speakers bureau for: AbbVie; Amgen; Eli Lilly; Janssen; Novartis; Pfizer; UCB 

Received research grant from: AbbVie; Amgen; Bristol Myers Squibb; Eli Lilly; Galapagos; Gilead; Janssen; Novartis; Pfizer; Sun Pharma; UCB 

Change is inevitable in residency as well as in life. Every year on July 1, the atmosphere and social structure of residencies change with the new postgraduate year 2 class. Each class brings a unique perspective and energy. Residents come together from different backgrounds and life situations. Some residents are single, some are engaged or married, and some are starting or expanding their families. Some residents will have prior careers, others will have graduate degrees or expertise in various fields. They will have different ethnic backgrounds, religious and/or spiritual beliefs, familial upbringings, personalities, and methods of communicating. These differences all are important to consider when developing a mindset of inclusion and camaraderie. As residents start their journey together, it is important to remember that residency is a team endeavor. The principles of teamwork apply directly to residents and are founded on creating a climate of trust and building strong relationships with one another._¹ Trust is the foundation of good relationships in the workplace; it allows people to communicate freely and foster the belief that everyone is working for each other’s best interests. Being open and sharing knowledge about networking opportunities, scholarships, and research projects is one way to foster collaboration and trust in residency.

Diversity, equity, and inclusion in dermatology is a work in progress. In the 2020-2021 dermatology application cycle, only 4.8% of applicants identified as Hispanic or Latino, and 7.8% identified as Black or African American.² The American Academy of Dermatology took an active role in promoting diversity by creating a task force in 2018 to increase the exposure and recruitment into dermatology of medical students who are underrepresented in medicine.2 As standards for diversity are met in dermatology, we will have the wonderful opportunity to welcome even more diversity into our lives.

Listening, showing curiosity about your co-residents’ lives outside of work, and asking questions can help build respect, friendships, and camaraderie. Ask your co-residents what makes them happy and what their goals are in residency. Finding common goals and cultivating the mindset that you all work together to achieve your goals is key to the success of a residency class. Now that we discussed accepting and welcoming differences, how do you foster camaraderie in a social setting?

Establish a Social Committee

As a class, consider 1 or 2 residents who are always excited to try new activities such as attend restaurant openings, exercise classes, concerts, or movie nights. Consider nominating these co-residents along with one attending to be social chairs of your residency. The social chairs should meet and establish at least 1 social event per season, with 4 total for the academic year. There are only 2 rules with social events: (1) they must be held outside of clinic, and (2) everyone should try their best to attend.

Social chairs should try to prioritize a location-specific event that allows the residents who are not from the area to experience something local, which can be anything from apple picking at an orchard in the fall to beach volleyball in the summer. Planning these parties gives everyone an event to look forward to and a chance to spend time together and grow closer. The memories and inside jokes that arise from these outings are invaluable and increase joy inside and outside of clinic.

Utilize Social Media

Another project can be developing a social media account for your program with the approval of your faculty. @unmcdermatology, @uwderm, and @gwdermres can help foster social relationships by establishing a lighthearted space to celebrate the residency’s achievements, new publications, volunteer events, or social gatherings.

Encourage Local and National Conference Attendance

All residents should be encouraged to submit abstracts to local and national conferences and attend with their co-residents. Conferences are peak opportunities to foster camaraderie within residency classes, as they involve a sense of togetherness in the specialty along with the excitement of traveling to a new city and meeting other like-minded individuals. Conferences allow collaboration within the specialty on a national level and foster relationships between residency programs.

In addition, national groups such as the Women’s Dermatologic Society, the Skin of Color Society, and the American Academy of Dermatology Diversity, Equity, and Inclusion task force meet at the national conferences and discuss their next initiatives and projects. Joining a society of your interest can lead to many new networks and relationships you may not have had before. Even if you are not interested in specializing after general dermatology, consider attending a surgery, dermatopathology, or pediatric or cosmetic dermatology conference to learn more about the field from the experts.

Repair Conflicts and Build a Climate of Collaboration

Conflicts and disagreements unfortunately are inevitable during residency. Whether they involve planning vacation times or coordinating call schedules, everyone will not agree on every decision. Learning how to handle and approach conflict with co-residents is of utmost importance to maintaining the hard work you have put in to create trust, camaraderie, and a good social atmosphere. If you are having an issue with a circumstance involving a co-resident, holding a grudge will only sour your experience and the experience of others. Talking to your co-resident directly about your concerns before escalating the issue to a chief resident or faculty member is a great start. Consider asking them about their thought process and show concern for their point of view. Listen to them openly before going into your preferences. It is important to remember that working as a team requires sacrifices, and sometimes you will not be satisfied with the outcome of a conflict.

It also is important to remember that feelings change, and an issue you feel you must address immediately can wait to be addressed at a better time when you have calmed down. You may even find that you decide not to address it at all. At the end of the day, if a conflict cannot be worked out between those involved, consider confiding in a chief resident or a faculty mentor for advice on the next steps to take to resolve the problem. Ultimately, having a good foundation of respect and strong bonds with your residents will help tremendously when conflicts arise.

Final Thoughts

Fostering camaraderie in residency will improve the overall experience and lives of the residents, as well as the experience of the faculty, staff, and patients by the trickle-down effect. Creating a cheerful and fun atmosphere filled with inside jokes and excitement regarding upcoming social events or conferences will certainly result in a time you will cherish for the rest of your life.

Change is inevitable in residency as well as in life. Every year on July 1, the atmosphere and social structure of residencies change with the new postgraduate year 2 class. Each class brings a unique perspective and energy. Residents come together from different backgrounds and life situations. Some residents are single, some are engaged or married, and some are starting or expanding their families. Some residents will have prior careers, others will have graduate degrees or expertise in various fields. They will have different ethnic backgrounds, religious and/or spiritual beliefs, familial upbringings, personalities, and methods of communicating. These differences all are important to consider when developing a mindset of inclusion and camaraderie. As residents start their journey together, it is important to remember that residency is a team endeavor. The principles of teamwork apply directly to residents and are founded on creating a climate of trust and building strong relationships with one another._¹ Trust is the foundation of good relationships in the workplace; it allows people to communicate freely and foster the belief that everyone is working for each other’s best interests. Being open and sharing knowledge about networking opportunities, scholarships, and research projects is one way to foster collaboration and trust in residency.

Diversity, equity, and inclusion in dermatology is a work in progress. In the 2020-2021 dermatology application cycle, only 4.8% of applicants identified as Hispanic or Latino, and 7.8% identified as Black or African American.² The American Academy of Dermatology took an active role in promoting diversity by creating a task force in 2018 to increase the exposure and recruitment into dermatology of medical students who are underrepresented in medicine.2 As standards for diversity are met in dermatology, we will have the wonderful opportunity to welcome even more diversity into our lives.

Listening, showing curiosity about your co-residents’ lives outside of work, and asking questions can help build respect, friendships, and camaraderie. Ask your co-residents what makes them happy and what their goals are in residency. Finding common goals and cultivating the mindset that you all work together to achieve your goals is key to the success of a residency class. Now that we discussed accepting and welcoming differences, how do you foster camaraderie in a social setting?

Establish a Social Committee

As a class, consider 1 or 2 residents who are always excited to try new activities such as attend restaurant openings, exercise classes, concerts, or movie nights. Consider nominating these co-residents along with one attending to be social chairs of your residency. The social chairs should meet and establish at least 1 social event per season, with 4 total for the academic year. There are only 2 rules with social events: (1) they must be held outside of clinic, and (2) everyone should try their best to attend.

Social chairs should try to prioritize a location-specific event that allows the residents who are not from the area to experience something local, which can be anything from apple picking at an orchard in the fall to beach volleyball in the summer. Planning these parties gives everyone an event to look forward to and a chance to spend time together and grow closer. The memories and inside jokes that arise from these outings are invaluable and increase joy inside and outside of clinic.

Utilize Social Media

Another project can be developing a social media account for your program with the approval of your faculty. @unmcdermatology, @uwderm, and @gwdermres can help foster social relationships by establishing a lighthearted space to celebrate the residency’s achievements, new publications, volunteer events, or social gatherings.

Encourage Local and National Conference Attendance

All residents should be encouraged to submit abstracts to local and national conferences and attend with their co-residents. Conferences are peak opportunities to foster camaraderie within residency classes, as they involve a sense of togetherness in the specialty along with the excitement of traveling to a new city and meeting other like-minded individuals. Conferences allow collaboration within the specialty on a national level and foster relationships between residency programs.

In addition, national groups such as the Women’s Dermatologic Society, the Skin of Color Society, and the American Academy of Dermatology Diversity, Equity, and Inclusion task force meet at the national conferences and discuss their next initiatives and projects. Joining a society of your interest can lead to many new networks and relationships you may not have had before. Even if you are not interested in specializing after general dermatology, consider attending a surgery, dermatopathology, or pediatric or cosmetic dermatology conference to learn more about the field from the experts.

Repair Conflicts and Build a Climate of Collaboration

Conflicts and disagreements unfortunately are inevitable during residency. Whether they involve planning vacation times or coordinating call schedules, everyone will not agree on every decision. Learning how to handle and approach conflict with co-residents is of utmost importance to maintaining the hard work you have put in to create trust, camaraderie, and a good social atmosphere. If you are having an issue with a circumstance involving a co-resident, holding a grudge will only sour your experience and the experience of others. Talking to your co-resident directly about your concerns before escalating the issue to a chief resident or faculty member is a great start. Consider asking them about their thought process and show concern for their point of view. Listen to them openly before going into your preferences. It is important to remember that working as a team requires sacrifices, and sometimes you will not be satisfied with the outcome of a conflict.

It also is important to remember that feelings change, and an issue you feel you must address immediately can wait to be addressed at a better time when you have calmed down. You may even find that you decide not to address it at all. At the end of the day, if a conflict cannot be worked out between those involved, consider confiding in a chief resident or a faculty mentor for advice on the next steps to take to resolve the problem. Ultimately, having a good foundation of respect and strong bonds with your residents will help tremendously when conflicts arise.

Final Thoughts

Fostering camaraderie in residency will improve the overall experience and lives of the residents, as well as the experience of the faculty, staff, and patients by the trickle-down effect. Creating a cheerful and fun atmosphere filled with inside jokes and excitement regarding upcoming social events or conferences will certainly result in a time you will cherish for the rest of your life.

Change is inevitable in residency as well as in life. Every year on July 1, the atmosphere and social structure of residencies change with the new postgraduate year 2 class. Each class brings a unique perspective and energy. Residents come together from different backgrounds and life situations. Some residents are single, some are engaged or married, and some are starting or expanding their families. Some residents will have prior careers, others will have graduate degrees or expertise in various fields. They will have different ethnic backgrounds, religious and/or spiritual beliefs, familial upbringings, personalities, and methods of communicating. These differences all are important to consider when developing a mindset of inclusion and camaraderie. As residents start their journey together, it is important to remember that residency is a team endeavor. The principles of teamwork apply directly to residents and are founded on creating a climate of trust and building strong relationships with one another._¹ Trust is the foundation of good relationships in the workplace; it allows people to communicate freely and foster the belief that everyone is working for each other’s best interests. Being open and sharing knowledge about networking opportunities, scholarships, and research projects is one way to foster collaboration and trust in residency.

Diversity, equity, and inclusion in dermatology is a work in progress. In the 2020-2021 dermatology application cycle, only 4.8% of applicants identified as Hispanic or Latino, and 7.8% identified as Black or African American.² The American Academy of Dermatology took an active role in promoting diversity by creating a task force in 2018 to increase the exposure and recruitment into dermatology of medical students who are underrepresented in medicine.2 As standards for diversity are met in dermatology, we will have the wonderful opportunity to welcome even more diversity into our lives.

Listening, showing curiosity about your co-residents’ lives outside of work, and asking questions can help build respect, friendships, and camaraderie. Ask your co-residents what makes them happy and what their goals are in residency. Finding common goals and cultivating the mindset that you all work together to achieve your goals is key to the success of a residency class. Now that we discussed accepting and welcoming differences, how do you foster camaraderie in a social setting?

Establish a Social Committee

As a class, consider 1 or 2 residents who are always excited to try new activities such as attend restaurant openings, exercise classes, concerts, or movie nights. Consider nominating these co-residents along with one attending to be social chairs of your residency. The social chairs should meet and establish at least 1 social event per season, with 4 total for the academic year. There are only 2 rules with social events: (1) they must be held outside of clinic, and (2) everyone should try their best to attend.

Social chairs should try to prioritize a location-specific event that allows the residents who are not from the area to experience something local, which can be anything from apple picking at an orchard in the fall to beach volleyball in the summer. Planning these parties gives everyone an event to look forward to and a chance to spend time together and grow closer. The memories and inside jokes that arise from these outings are invaluable and increase joy inside and outside of clinic.

Utilize Social Media

Another project can be developing a social media account for your program with the approval of your faculty. @unmcdermatology, @uwderm, and @gwdermres can help foster social relationships by establishing a lighthearted space to celebrate the residency’s achievements, new publications, volunteer events, or social gatherings.

Encourage Local and National Conference Attendance

All residents should be encouraged to submit abstracts to local and national conferences and attend with their co-residents. Conferences are peak opportunities to foster camaraderie within residency classes, as they involve a sense of togetherness in the specialty along with the excitement of traveling to a new city and meeting other like-minded individuals. Conferences allow collaboration within the specialty on a national level and foster relationships between residency programs.

In addition, national groups such as the Women’s Dermatologic Society, the Skin of Color Society, and the American Academy of Dermatology Diversity, Equity, and Inclusion task force meet at the national conferences and discuss their next initiatives and projects. Joining a society of your interest can lead to many new networks and relationships you may not have had before. Even if you are not interested in specializing after general dermatology, consider attending a surgery, dermatopathology, or pediatric or cosmetic dermatology conference to learn more about the field from the experts.

Repair Conflicts and Build a Climate of Collaboration

Conflicts and disagreements unfortunately are inevitable during residency. Whether they involve planning vacation times or coordinating call schedules, everyone will not agree on every decision. Learning how to handle and approach conflict with co-residents is of utmost importance to maintaining the hard work you have put in to create trust, camaraderie, and a good social atmosphere. If you are having an issue with a circumstance involving a co-resident, holding a grudge will only sour your experience and the experience of others. Talking to your co-resident directly about your concerns before escalating the issue to a chief resident or faculty member is a great start. Consider asking them about their thought process and show concern for their point of view. Listen to them openly before going into your preferences. It is important to remember that working as a team requires sacrifices, and sometimes you will not be satisfied with the outcome of a conflict.

It also is important to remember that feelings change, and an issue you feel you must address immediately can wait to be addressed at a better time when you have calmed down. You may even find that you decide not to address it at all. At the end of the day, if a conflict cannot be worked out between those involved, consider confiding in a chief resident or a faculty mentor for advice on the next steps to take to resolve the problem. Ultimately, having a good foundation of respect and strong bonds with your residents will help tremendously when conflicts arise.

Final Thoughts

Fostering camaraderie in residency will improve the overall experience and lives of the residents, as well as the experience of the faculty, staff, and patients by the trickle-down effect. Creating a cheerful and fun atmosphere filled with inside jokes and excitement regarding upcoming social events or conferences will certainly result in a time you will cherish for the rest of your life.

Psychedelics are a class of substances known to produce alterations in consciousness and perception. In the last 2 decades, psychedelic research has garnered increasing attention from scientists, therapists, entrepreneurs, and the public. While many of these compounds remain illegal in the United States and in many parts of the world (Box¹), a recent resurrection of psychedelic research has motivated the FDA to designate multiple psychedelic compounds as “breakthrough therapies,” thereby expediting the investigation, development, and review of psychedelic treatments.

Box

There is growing evidence that psychedelics may be efficacious for treating a range of psychiatric disorders. Potential clinical indications for psychedelics include some forms of depression, posttraumatic stress disorder (PTSD), and substance use disorders (Table 1^2,3). In most instances, the clinical use of psychedelics is being investigated and offered in the context of psychedelic-assisted psychotherapy, though ketamine is a prominent exception. Ketamine and esketamine are already being used to treat depression, and FDA approval is anticipated for other psychedelics. An examination of the safety considerations of psychedelics for the treatment of psychiatric disorders is therefore highly relevant and timely.

This article examines the adverse effect profile of classical (psilocybin [“mushrooms”], lysergic acid diethylamide [LSD], and N,N-dimethyltryptamine [DMT]/ayahuasca) and nonclassical (the entactogen 3,4-methylenedioxymethamphetamine [MDMA, known as “ecstasy”] and the dissociative anesthetic ketamine) psychedelics.

Psilocybin

Psilocybin is typically administered as a single dose of 10 to 30 mg and used in conjunction with preintegration and postintegration psychotherapy. Administration of psilocybin typically produces perceptual distortions and mind-altering effects, which are mediated through 5-HT2A brain receptor agonistic action.⁴ The acute effects last approximately 6 hours.⁵ While psilocybin has generated promising results in early clinical trials,³ the adverse effects of these agents have received less attention.

The adverse effect profile of psilocybin in adults appears promising but its powerful psychoactive effects necessitate cautious use.⁶ It has a very wide therapeutic index, and in a recent meta-analysis of psilocybin for depression, no serious adverse effects were reported in any of the 7 included studies.⁷ Common adverse effects in the context of clinical use include anxiety, dysphoria, confusion, and an increase in blood pressure and heart rate.⁶ Due to potential cardiac effects, psilocybin is contraindicated in individuals with cardiovascular and cerebrovascular disease.⁸ In recreational/nonclinical use, reactions such as suicidality, violence, convulsions, panic attacks, paranoia, confusion, prolonged dissociation, and mania have been reported.^9,10 Animal and human studies indicate the risk of abuse and physical dependence is low. Major national surveys indicate low rates of abuse, treatment-seeking, and harm.¹¹ In a recent 6-week randomized controlled trial (RCT) of psilocybin vs escitalopram for depression,¹² no serious adverse events were reported. Adverse events reported in the psilocybin group in this trial are listed in Table 2.¹²

A recent phase 2 double-blind trial of single-dose psilocybin (1 mg, 10 mg, and 25 mg) for treatment-resistant depression (N = 233) sheds more light on the risk of adverse effects.¹³ The percentage of individuals experiencing adverse effects on Day 1 of administration was high: 61% in the 25 mg psilocybin group. Headache, nausea, fatigue, and dizziness were the most common effects. The incidence of any adverse event in the 25 mg group was 56% from Day 2 to Week 3, and 29% from Week 3 to Week 12. Suicidal ideation, suicidal behavior, or self-injury occurred in all 3 dose groups. Overall, 14% in the 25 mg group, 17% in the 10 mg group, and 9% in the 1 mg group showed worsening of suicidality from baseline to Week 3. Suicidal behavior was reported by 3 individuals in the 25 mg group after Week 3. The new-onset or worsening of preexisting suicidality with psilocybin reported in this study requires further investigation.

Lysergic acid diethylamide

LSD is similar to psilocybin in its agonistic action at the 5-HT2A brain receptors.⁴ It is typically administered as a single 100 to 200 μg dose and is used in conjunction with preintegration and postintegration psychotherapy.¹⁴ Its acute effects last approximately 12 hours.¹⁵

Continue to: Like psilocybin...

Like psilocybin, LSD has a wide therapeutic index. Commonly reported adverse effects of LSD are increased anxiety, dysphoria, and confusion. LSD can also lead to physiological adverse effects, such as increased blood pressure and heart rate, and thus is contraindicated in patients with severe heart disease.⁶ In a systematic review of the therapeutic use of LSD that included 567 participants,¹⁶ 2 cases of serious adverse events were reported: a tonic-clonic seizure in a patient with a prior history of seizures, and a case of prolonged psychosis in a 21-year-old with a history of psychotic disorder.

Though few psychedelic studies have examined the adverse effects of these agents in older adults, a recent phase 1 study that recruited 48 healthy older adults (age 55 to 75) found that, compared to placebo, low doses (5 to 20 μg) of LSD 2 times a week for 3 weeks had similar adverse effects, cognitive impairment, or balance impairment.¹⁷ The only adverse effect noted to be different between the placebo group and active treatment groups was headache (50% for LSD 10 μg, 25% for LSD 20 μg, and 8% for placebo). Because the dose range (5 to 20 μg) used in this study was substantially lower than the typical therapeutic dose range of 100 to 200 μg, these results should not be interpreted as supporting the safety of LSD at higher doses in older adults.

DMT/ayahuasca

Ayahuasca is a plant-based psychedelic that contains an admixture of substances, including DMT, which acts as a 5-HT2A receptor agonist. In addition to DMT, ayahuasca also contains the alkaloid harmaline, which acts as a monoamine inhibitor. Use of ayahuasca can therefore pose a particular risk for individuals taking other serotonergic or noradrenergic medications or substances. The acute effects of DMT last approximately 4 hours,¹⁸ and acute administration of ayahuasca leads to a transient modified state of consciousness that is characterized by introspection, visions, enhanced emotions, and recall of personal memories.¹⁹ Research shows ayahuasca has been dosed at approximately 0.36 mg/kg of DMT for 1 dosing session alongside 6 2-hour therapy sessions.²⁰

A recent review by Orsolini et al²¹ consolidated 40 preclinical, observational, and experimental studies of ayahuasca, and this compound appeared to be safe and well-tolerated; the most common adverse effects were transient emesis and nausea. In an RCT by Palhano-Fontes et al,²⁰ nausea was observed in 71% of participants in the ayahuasca group (vs 26% placebo), vomiting in 57% of participants (vs 0% placebo), and restlessness in 50% of participants (vs 20% placebo). The authors noted that for some participants the ayahuasca session “was not necessarily a pleasant experience,” and was accompanied by psychological distress.²⁰ Vomiting is traditionally viewed as an expected part of the purging process of ayahuasca religious ceremonies. Another review found that there appears to be good long-term tolerability of ayahuasca consumption among individuals who use this compound in religious ceremonies.²²

MDMA

Entactogens (or empathogens) are a class of psychoactive substances that produce experiences of emotional openness and connection. MDMA is an entactogen known to release serotonin, norepinephrine, and dopamine by inhibiting reuptake.²³ This process leads to the stimulation of neurohormonal signaling of oxytocin, cortisol, and other signaling molecules such as brain-derived neurotrophic factor.²⁴ Memory reconsolidation and fear extinction may also play a therapeutic role, enabled by reduced activity in the amygdala and insula, and increased connectivity between the amygdala and hippocampus.²⁴ MDMA has been reported to enhance feelings of well-being and increase prosocial behavior.²⁵ In the therapeutic setting, MDMA has been generally dosed at 75 to 125 mg in 2 to 3 sessions alongside 10 therapy sessions. Administration of MDMA gives the user a subjective experience of energy and distortions in time and perception.²⁶ These acute effects last approximately 2 to 4 hours.²⁷

Continue to: A meta-analysis...

A meta-analysis of 5 RCTs of MDMA-assisted therapy for PTSD in adults demonstrated that MDMA was well-tolerated, and few serious adverse events were reported.²⁸ Two trials from 2018 that were included in this meta-analysis—Mithoefer et al²⁹ and Ot’alora et al³⁰—illustrate the incidence of specific adverse effects. In a randomized, double-blind trial of 26 veterans and first responders with chronic PTSD, Mithoefer et al²⁹ found the most commonly reported reactions during experimental sessions with MDMA were anxiety (81%), headache (69%), fatigue (62%), muscle tension (62%), and jaw clenching or tight jaw (50%). The most commonly reported reactions during 7 days of contact were fatigue (88%), anxiety (73%), insomnia (69%), headache (46%), muscle tension (46%), and increased irritability (46%). One instance of suicidal ideation was severe enough to require psychiatric hospitalization (this was the only instance of suicidal ideation among the 106 patients in the meta-analysis by Bahji et al²⁸); the patient subsequently completed the trial. Transient elevation in pulse, blood pressure, and body temperature were noted during sessions that did not require medical intervention.²⁹ Ot’alora et al³⁰ found similar common adverse reactions: anxiety, dizziness, fatigue, headache, jaw clenching, muscle tension, and irritability. There were no serious adverse effects.

While the use of MDMA in controlled interventional settings has resulted in relatively few adverse events, robust literature describes the risks associated with the nonclinical/recreational use of MDMA. In cases of MDMA toxicity, death has been reported.³¹ Acutely, MDMA may lead to sympathomimetic effects, including serotonin syndrome.³¹ Longer-term studies of MDMA users have found chronic recreational use to be associated with worse sleep, poor mood, anxiety disturbances, memory deficits, and attention problems.³² MDMA has also been found to have moderate potential for abuse.³³

Ketamine/esketamine

Ketamine is a dissociative anesthetic with some hallucinogenic effects. It is an N-methyl-d-aspartate (NMDA) antagonist frequently used in anesthesia, and it can induce a state of sedation, immobility, pain relief, and amnesia. In low doses, ketamine is used off-label to treat major depressive disorder and treatment-resistant depression. Most clinical trials of ketamine for depression have dosed IV ketamine from 0.5 to 1 mg/kg 1 to 3 times a week. It can also be administered as an IM, intranasal, oral, subcutaneous, or sublingual formulation.³⁴

Esketamine, the S(+)-enantiomer of ketamine, is also an NDMA antagonist. It has been developed as an intranasal formulation, typically dosed between 56 and 84 mg 2 times a week for 1 month, once a week for the following month, and once every 1 to 2 weeks thereafter.³⁵ In most ketamine and esketamine trials, these compounds have been used without psychotherapy, although some interventions have integrated psychotherapy with ketamine treatment.³⁶

Bennett et al³⁷ elaborated on 3 paradigms for ketamine treatment: biochemical, psychotherapeutic, and psychedelic. The biochemical model examines the neuro­biological effects of the medication. The psychotherapeutic model views ketamine as a way of assisting the psychotherapy process. The psychedelic model utilizes ketamine’s dissociative and psychedelic properties to induce an altered state of consciousness for therapeutic purposes and psychospiritual exploration.

Continue to: A systematic review...

A systematic review of the common adverse effects associated with ketamine use in clinical trials for depression reported dissociation, sedation, perceptual disturbances, anxiety, agitation, euphoria, hypertension, tachycardia, headache, and dizziness.³⁸ Adverse effects experienced with esketamine in clinical trials include dissociation, dizziness, sedation, hypertension, hypoesthesia, gastrointestinal symptoms, and euphoric mood (Table 3³⁹). A recent systemic review found both ketamine and esketamine demonstrated higher adverse events than control conditions. IV ketamine also demonstrated lower dropouts and adverse events when compared to intranasal esketamine.⁴⁰

Nonclinical/recreational use of ketamine is notable for urinary toxicity; 20% to 30% of frequent users of ketamine experience urinary problems that can range from ketamine-induced cystitis to hydronephrosis and kidney failure.⁴¹ Liver toxicity has also been reported with chronic use of high-dose ketamine. Ketamine is liable to abuse, dependence, and tolerance. There is evidence that nonclinical use of ketamine may lead to morbidity; impairment of memory, cognition, and attention; and urinary, gastric, and hepatic pathology.⁴²

The FDA prescribing information for esketamine lists aneurysmal vascular disease, arteriovenous malformation, and intracerebral hemorrhage as contraindications.³⁹ Patients with cardiovascular and cerebrovascular conditions and risk factors may be at increased risk of adverse effects due to an increase in blood pressure. Esketamine can impair attention, judgment, thinking, reaction speed, and motor skills. Other adverse effects of esketamine noted in the prescribing information include dissociation, dizziness, nausea, sedation, vertigo, hypoesthesia, anxiety, lethargy, vomiting, feeling drunk, and euphoric mood.³⁹A study of postmarketing safety concerns with esketamine using reports submitted to the FDA Adverse Event Reporting System (FAERS) revealed signals for suicidal ideation (reporting odds ratio [ROR] 24.03; 95% CI, 18.72 to 30.84), and completed suicide (ROR 5.75; 95% CI, 3.18 to 10.41).⁴³ The signals for suicidal and self-injurious ideation remained significant when compared to venlafaxine in the FAERS database, while suicide attempts and fatal suicide attempts were no longer significant.⁴³ Concerns regarding acute ketamine withdrawal have also been described in case reports.⁴⁴

Other safety considerations of psychedelics

Hallucinogen persisting perception disorder

Hallucinogen persisting perception disorder (HPPD) is a rare condition associated with hallucinogen use. It is characterized by the recurrence of perceptual disturbances that an individual experienced while using hallucinogenic substances that creates significant distress or impairment.⁴⁵ Because HPPD is a rare disorder, the exact prevalence is not well characterized, but DSM-5 suggests it is approximately 4.2%.⁴⁶ HPPD is associated with numerous psychoactive substances, including psilocybin, ayahuasca, MDMA, and ketamine, but is most associated with LSD.⁴⁵ HPPD is more likely to arise in individuals with histories of psychiatric illness or substance use disorders.⁴⁷

Serotonin toxicity and other serotonergic interactions

Serotonin toxicity is a risk of serotonergic psychedelics, particularly when such agents are used in combination with serotonergic psychotropic medications. The most severe manifestation of serotonin toxicity is serotonin syndrome, which manifests as a life-threatening condition characterized by myoclonus, rigidity, agitation, delirium, and unstable cardiovascular functioning. Many psychedelic compounds have transient serotonin-related adverse effects, but serotonin toxicity due to psychedelic use is rare.⁴⁸ Due to their mechanism of action, classical psychedelics are relatively safe in combination with monoamine oxidase inhibitors (MAOIs) and selective serotonin reuptake inhibitors. MDMA is a serotonin-releasing agent that has a higher risk of serotonin syndrome or hypertensive crisis when used in combination with MAOIs.⁴⁸

Boundary violations in psychedelic-assisted psychotherapy

A key task facing psychedelic research is to establish parameters for the safe and ethical use of these agents. This is particularly relevant given the hype that surrounds the psychedelic resurgence and what we know about the controversial history of these substances. Anderson et al⁴⁹ argued that “psychedelics can have lingering effects that include increased suggestibility and affective instability, as well as altered ego structure, social behaviour, and philosophical worldview. Stated simply, psychedelics can induce a vulnerable state both during and after treatment sessions.”

Continue to: Psychedelic treatment...

Psychedelic treatments such as psilocybin and MDMA are typically offered within the context of psychedelic-assisted psychotherapy, and some researchers have raised concerns regarding boundary violations,⁵⁰ given the patients’ particularly vulnerable states. In addition to concerns about sexual harassment, the financial exploitation of older adults is also a possible risk.⁵¹

Caveats to consider

Novel psychedelics therapies have demonstrated promising preliminary results for a broad range of psychiatric indications, including depression, end-of-life distress, substance use disorders, PTSD, and improving well-being. To date, psychedelics are generally well-tolerated in adults in clinical trials.

However, when it comes to adverse effects, there are challenges in regards to interpreting the psychedelic state.⁵² Some consider any unpleasant or unsettling psychedelic experience as an adverse reaction, while others consider it part of the therapeutic process. This is exemplified by the case of vomiting during ayahuasca ceremonies, which is generally considered part of the ritual. In such instances, it is essential to obtain informed consent and ensure participants are aware of these aspects of the experience. Compared to substances such as alcohol, opioids, and cocaine, psychedelics are remarkably safe from a physiological perspective, especially with regards to the risks of toxicity, mortality, and dependence.⁵³ Their psychological safety is less established, and more caution and research is needed. The high incidence of adverse effects and suicidality noted in the recent phase 2 trial of psilocybin in treatment resistant depression are a reminder of this.¹³

There is uncertainty regarding the magnitude of risk in real-world clinical practice, particularly regarding addiction, suicidality, and precipitation or worsening of psychotic disorders. For example, note the extensive exclusion criteria used in the psilocybin vs escitalopram RCT by Carhart-Harris et al¹²: currently or previously diagnosed psychotic disorder, immediate family member with a diagnosed psychotic disorder, significant medical comorbidity (eg, diabetes, epilepsy, severe cardiovascular disease, hepatic or renal failure), history of suicide attempts requiring hospitalization, history of mania, pregnancy, and abnormal QT interval prolongation, among others. It would be prudent to keep these contraindications in mind regarding the clinical use of psychedelics in the future. This is particularly important in older adults because such patients often have substantial medical comorbidities and are at greater risk for adverse effects. For ketamine, research has implicated the role of mu opioid agonism in mediating ketamine’s antidepressant effects.⁵⁴ This raises concerns about abuse, dependence, and addiction, especially with long-term use. There are also concerns regarding protracted withdrawal symptoms and associated suicidality.⁵⁵

The therapeutic use of psychedelics is an exciting and promising avenue, with ongoing research and a rapidly evolving literature. An attitude of cautious optimism is warranted, but efficacy and safety should be demonstrated in well-designed and rigorous trials with adequate long-term follow-up before routine clinical use is recommended.

Bottom Line

In clinical trials for psychiatric disorders, psychedelics have been associated with a range of cognitive, psychiatric, and psychoactive adverse effects but generally have been well-tolerated, with a low incidence of serious adverse effects.

Related Resources

• American Psychiatric Association. Position Statement on the Use of Psychedelic and Empathogenic Agents for Mental Health Conditions. Updated July 2022. Accessed October 24, 2022. https://www.psychiatry.org/getattachment/d5c13619-ca1f-491f-a7a8-b7141c800904/Position-Use-of-Psychedelic-Empathogenic-Agents.pdf
• Johns Hopkins Center for Psychedelic & Consciousness Research. https://hopkinspsychedelic.org/
• Multidisciplinary Association for Psychedelic Studies (MAPS). https://maps.org/

Drug Brand Names

Esketamine • Spravato
Ketamine • Ketalar
Venlafaxine • Effexor

Psychedelics are a class of substances known to produce alterations in consciousness and perception. In the last 2 decades, psychedelic research has garnered increasing attention from scientists, therapists, entrepreneurs, and the public. While many of these compounds remain illegal in the United States and in many parts of the world (Box¹), a recent resurrection of psychedelic research has motivated the FDA to designate multiple psychedelic compounds as “breakthrough therapies,” thereby expediting the investigation, development, and review of psychedelic treatments.

Box

There is growing evidence that psychedelics may be efficacious for treating a range of psychiatric disorders. Potential clinical indications for psychedelics include some forms of depression, posttraumatic stress disorder (PTSD), and substance use disorders (Table 1^2,3). In most instances, the clinical use of psychedelics is being investigated and offered in the context of psychedelic-assisted psychotherapy, though ketamine is a prominent exception. Ketamine and esketamine are already being used to treat depression, and FDA approval is anticipated for other psychedelics. An examination of the safety considerations of psychedelics for the treatment of psychiatric disorders is therefore highly relevant and timely.

This article examines the adverse effect profile of classical (psilocybin [“mushrooms”], lysergic acid diethylamide [LSD], and N,N-dimethyltryptamine [DMT]/ayahuasca) and nonclassical (the entactogen 3,4-methylenedioxymethamphetamine [MDMA, known as “ecstasy”] and the dissociative anesthetic ketamine) psychedelics.

Psilocybin

Psilocybin is typically administered as a single dose of 10 to 30 mg and used in conjunction with preintegration and postintegration psychotherapy. Administration of psilocybin typically produces perceptual distortions and mind-altering effects, which are mediated through 5-HT2A brain receptor agonistic action.⁴ The acute effects last approximately 6 hours.⁵ While psilocybin has generated promising results in early clinical trials,³ the adverse effects of these agents have received less attention.

The adverse effect profile of psilocybin in adults appears promising but its powerful psychoactive effects necessitate cautious use.⁶ It has a very wide therapeutic index, and in a recent meta-analysis of psilocybin for depression, no serious adverse effects were reported in any of the 7 included studies.⁷ Common adverse effects in the context of clinical use include anxiety, dysphoria, confusion, and an increase in blood pressure and heart rate.⁶ Due to potential cardiac effects, psilocybin is contraindicated in individuals with cardiovascular and cerebrovascular disease.⁸ In recreational/nonclinical use, reactions such as suicidality, violence, convulsions, panic attacks, paranoia, confusion, prolonged dissociation, and mania have been reported.^9,10 Animal and human studies indicate the risk of abuse and physical dependence is low. Major national surveys indicate low rates of abuse, treatment-seeking, and harm.¹¹ In a recent 6-week randomized controlled trial (RCT) of psilocybin vs escitalopram for depression,¹² no serious adverse events were reported. Adverse events reported in the psilocybin group in this trial are listed in Table 2.¹²

A recent phase 2 double-blind trial of single-dose psilocybin (1 mg, 10 mg, and 25 mg) for treatment-resistant depression (N = 233) sheds more light on the risk of adverse effects.¹³ The percentage of individuals experiencing adverse effects on Day 1 of administration was high: 61% in the 25 mg psilocybin group. Headache, nausea, fatigue, and dizziness were the most common effects. The incidence of any adverse event in the 25 mg group was 56% from Day 2 to Week 3, and 29% from Week 3 to Week 12. Suicidal ideation, suicidal behavior, or self-injury occurred in all 3 dose groups. Overall, 14% in the 25 mg group, 17% in the 10 mg group, and 9% in the 1 mg group showed worsening of suicidality from baseline to Week 3. Suicidal behavior was reported by 3 individuals in the 25 mg group after Week 3. The new-onset or worsening of preexisting suicidality with psilocybin reported in this study requires further investigation.

Lysergic acid diethylamide

LSD is similar to psilocybin in its agonistic action at the 5-HT2A brain receptors.⁴ It is typically administered as a single 100 to 200 μg dose and is used in conjunction with preintegration and postintegration psychotherapy.¹⁴ Its acute effects last approximately 12 hours.¹⁵

Continue to: Like psilocybin...

Like psilocybin, LSD has a wide therapeutic index. Commonly reported adverse effects of LSD are increased anxiety, dysphoria, and confusion. LSD can also lead to physiological adverse effects, such as increased blood pressure and heart rate, and thus is contraindicated in patients with severe heart disease.⁶ In a systematic review of the therapeutic use of LSD that included 567 participants,¹⁶ 2 cases of serious adverse events were reported: a tonic-clonic seizure in a patient with a prior history of seizures, and a case of prolonged psychosis in a 21-year-old with a history of psychotic disorder.

Though few psychedelic studies have examined the adverse effects of these agents in older adults, a recent phase 1 study that recruited 48 healthy older adults (age 55 to 75) found that, compared to placebo, low doses (5 to 20 μg) of LSD 2 times a week for 3 weeks had similar adverse effects, cognitive impairment, or balance impairment.¹⁷ The only adverse effect noted to be different between the placebo group and active treatment groups was headache (50% for LSD 10 μg, 25% for LSD 20 μg, and 8% for placebo). Because the dose range (5 to 20 μg) used in this study was substantially lower than the typical therapeutic dose range of 100 to 200 μg, these results should not be interpreted as supporting the safety of LSD at higher doses in older adults.

DMT/ayahuasca

Ayahuasca is a plant-based psychedelic that contains an admixture of substances, including DMT, which acts as a 5-HT2A receptor agonist. In addition to DMT, ayahuasca also contains the alkaloid harmaline, which acts as a monoamine inhibitor. Use of ayahuasca can therefore pose a particular risk for individuals taking other serotonergic or noradrenergic medications or substances. The acute effects of DMT last approximately 4 hours,¹⁸ and acute administration of ayahuasca leads to a transient modified state of consciousness that is characterized by introspection, visions, enhanced emotions, and recall of personal memories.¹⁹ Research shows ayahuasca has been dosed at approximately 0.36 mg/kg of DMT for 1 dosing session alongside 6 2-hour therapy sessions.²⁰

A recent review by Orsolini et al²¹ consolidated 40 preclinical, observational, and experimental studies of ayahuasca, and this compound appeared to be safe and well-tolerated; the most common adverse effects were transient emesis and nausea. In an RCT by Palhano-Fontes et al,²⁰ nausea was observed in 71% of participants in the ayahuasca group (vs 26% placebo), vomiting in 57% of participants (vs 0% placebo), and restlessness in 50% of participants (vs 20% placebo). The authors noted that for some participants the ayahuasca session “was not necessarily a pleasant experience,” and was accompanied by psychological distress.²⁰ Vomiting is traditionally viewed as an expected part of the purging process of ayahuasca religious ceremonies. Another review found that there appears to be good long-term tolerability of ayahuasca consumption among individuals who use this compound in religious ceremonies.²²

MDMA

Entactogens (or empathogens) are a class of psychoactive substances that produce experiences of emotional openness and connection. MDMA is an entactogen known to release serotonin, norepinephrine, and dopamine by inhibiting reuptake.²³ This process leads to the stimulation of neurohormonal signaling of oxytocin, cortisol, and other signaling molecules such as brain-derived neurotrophic factor.²⁴ Memory reconsolidation and fear extinction may also play a therapeutic role, enabled by reduced activity in the amygdala and insula, and increased connectivity between the amygdala and hippocampus.²⁴ MDMA has been reported to enhance feelings of well-being and increase prosocial behavior.²⁵ In the therapeutic setting, MDMA has been generally dosed at 75 to 125 mg in 2 to 3 sessions alongside 10 therapy sessions. Administration of MDMA gives the user a subjective experience of energy and distortions in time and perception.²⁶ These acute effects last approximately 2 to 4 hours.²⁷

Continue to: A meta-analysis...

A meta-analysis of 5 RCTs of MDMA-assisted therapy for PTSD in adults demonstrated that MDMA was well-tolerated, and few serious adverse events were reported.²⁸ Two trials from 2018 that were included in this meta-analysis—Mithoefer et al²⁹ and Ot’alora et al³⁰—illustrate the incidence of specific adverse effects. In a randomized, double-blind trial of 26 veterans and first responders with chronic PTSD, Mithoefer et al²⁹ found the most commonly reported reactions during experimental sessions with MDMA were anxiety (81%), headache (69%), fatigue (62%), muscle tension (62%), and jaw clenching or tight jaw (50%). The most commonly reported reactions during 7 days of contact were fatigue (88%), anxiety (73%), insomnia (69%), headache (46%), muscle tension (46%), and increased irritability (46%). One instance of suicidal ideation was severe enough to require psychiatric hospitalization (this was the only instance of suicidal ideation among the 106 patients in the meta-analysis by Bahji et al²⁸); the patient subsequently completed the trial. Transient elevation in pulse, blood pressure, and body temperature were noted during sessions that did not require medical intervention.²⁹ Ot’alora et al³⁰ found similar common adverse reactions: anxiety, dizziness, fatigue, headache, jaw clenching, muscle tension, and irritability. There were no serious adverse effects.

While the use of MDMA in controlled interventional settings has resulted in relatively few adverse events, robust literature describes the risks associated with the nonclinical/recreational use of MDMA. In cases of MDMA toxicity, death has been reported.³¹ Acutely, MDMA may lead to sympathomimetic effects, including serotonin syndrome.³¹ Longer-term studies of MDMA users have found chronic recreational use to be associated with worse sleep, poor mood, anxiety disturbances, memory deficits, and attention problems.³² MDMA has also been found to have moderate potential for abuse.³³

Ketamine/esketamine

Ketamine is a dissociative anesthetic with some hallucinogenic effects. It is an N-methyl-d-aspartate (NMDA) antagonist frequently used in anesthesia, and it can induce a state of sedation, immobility, pain relief, and amnesia. In low doses, ketamine is used off-label to treat major depressive disorder and treatment-resistant depression. Most clinical trials of ketamine for depression have dosed IV ketamine from 0.5 to 1 mg/kg 1 to 3 times a week. It can also be administered as an IM, intranasal, oral, subcutaneous, or sublingual formulation.³⁴

Esketamine, the S(+)-enantiomer of ketamine, is also an NDMA antagonist. It has been developed as an intranasal formulation, typically dosed between 56 and 84 mg 2 times a week for 1 month, once a week for the following month, and once every 1 to 2 weeks thereafter.³⁵ In most ketamine and esketamine trials, these compounds have been used without psychotherapy, although some interventions have integrated psychotherapy with ketamine treatment.³⁶

Bennett et al³⁷ elaborated on 3 paradigms for ketamine treatment: biochemical, psychotherapeutic, and psychedelic. The biochemical model examines the neuro­biological effects of the medication. The psychotherapeutic model views ketamine as a way of assisting the psychotherapy process. The psychedelic model utilizes ketamine’s dissociative and psychedelic properties to induce an altered state of consciousness for therapeutic purposes and psychospiritual exploration.

Continue to: A systematic review...

A systematic review of the common adverse effects associated with ketamine use in clinical trials for depression reported dissociation, sedation, perceptual disturbances, anxiety, agitation, euphoria, hypertension, tachycardia, headache, and dizziness.³⁸ Adverse effects experienced with esketamine in clinical trials include dissociation, dizziness, sedation, hypertension, hypoesthesia, gastrointestinal symptoms, and euphoric mood (Table 3³⁹). A recent systemic review found both ketamine and esketamine demonstrated higher adverse events than control conditions. IV ketamine also demonstrated lower dropouts and adverse events when compared to intranasal esketamine.⁴⁰

Nonclinical/recreational use of ketamine is notable for urinary toxicity; 20% to 30% of frequent users of ketamine experience urinary problems that can range from ketamine-induced cystitis to hydronephrosis and kidney failure.⁴¹ Liver toxicity has also been reported with chronic use of high-dose ketamine. Ketamine is liable to abuse, dependence, and tolerance. There is evidence that nonclinical use of ketamine may lead to morbidity; impairment of memory, cognition, and attention; and urinary, gastric, and hepatic pathology.⁴²

The FDA prescribing information for esketamine lists aneurysmal vascular disease, arteriovenous malformation, and intracerebral hemorrhage as contraindications.³⁹ Patients with cardiovascular and cerebrovascular conditions and risk factors may be at increased risk of adverse effects due to an increase in blood pressure. Esketamine can impair attention, judgment, thinking, reaction speed, and motor skills. Other adverse effects of esketamine noted in the prescribing information include dissociation, dizziness, nausea, sedation, vertigo, hypoesthesia, anxiety, lethargy, vomiting, feeling drunk, and euphoric mood.³⁹A study of postmarketing safety concerns with esketamine using reports submitted to the FDA Adverse Event Reporting System (FAERS) revealed signals for suicidal ideation (reporting odds ratio [ROR] 24.03; 95% CI, 18.72 to 30.84), and completed suicide (ROR 5.75; 95% CI, 3.18 to 10.41).⁴³ The signals for suicidal and self-injurious ideation remained significant when compared to venlafaxine in the FAERS database, while suicide attempts and fatal suicide attempts were no longer significant.⁴³ Concerns regarding acute ketamine withdrawal have also been described in case reports.⁴⁴

Other safety considerations of psychedelics

Hallucinogen persisting perception disorder

Hallucinogen persisting perception disorder (HPPD) is a rare condition associated with hallucinogen use. It is characterized by the recurrence of perceptual disturbances that an individual experienced while using hallucinogenic substances that creates significant distress or impairment.⁴⁵ Because HPPD is a rare disorder, the exact prevalence is not well characterized, but DSM-5 suggests it is approximately 4.2%.⁴⁶ HPPD is associated with numerous psychoactive substances, including psilocybin, ayahuasca, MDMA, and ketamine, but is most associated with LSD.⁴⁵ HPPD is more likely to arise in individuals with histories of psychiatric illness or substance use disorders.⁴⁷

Serotonin toxicity and other serotonergic interactions

Serotonin toxicity is a risk of serotonergic psychedelics, particularly when such agents are used in combination with serotonergic psychotropic medications. The most severe manifestation of serotonin toxicity is serotonin syndrome, which manifests as a life-threatening condition characterized by myoclonus, rigidity, agitation, delirium, and unstable cardiovascular functioning. Many psychedelic compounds have transient serotonin-related adverse effects, but serotonin toxicity due to psychedelic use is rare.⁴⁸ Due to their mechanism of action, classical psychedelics are relatively safe in combination with monoamine oxidase inhibitors (MAOIs) and selective serotonin reuptake inhibitors. MDMA is a serotonin-releasing agent that has a higher risk of serotonin syndrome or hypertensive crisis when used in combination with MAOIs.⁴⁸

Boundary violations in psychedelic-assisted psychotherapy

A key task facing psychedelic research is to establish parameters for the safe and ethical use of these agents. This is particularly relevant given the hype that surrounds the psychedelic resurgence and what we know about the controversial history of these substances. Anderson et al⁴⁹ argued that “psychedelics can have lingering effects that include increased suggestibility and affective instability, as well as altered ego structure, social behaviour, and philosophical worldview. Stated simply, psychedelics can induce a vulnerable state both during and after treatment sessions.”

Continue to: Psychedelic treatment...

Psychedelic treatments such as psilocybin and MDMA are typically offered within the context of psychedelic-assisted psychotherapy, and some researchers have raised concerns regarding boundary violations,⁵⁰ given the patients’ particularly vulnerable states. In addition to concerns about sexual harassment, the financial exploitation of older adults is also a possible risk.⁵¹

Caveats to consider

Novel psychedelics therapies have demonstrated promising preliminary results for a broad range of psychiatric indications, including depression, end-of-life distress, substance use disorders, PTSD, and improving well-being. To date, psychedelics are generally well-tolerated in adults in clinical trials.

However, when it comes to adverse effects, there are challenges in regards to interpreting the psychedelic state.⁵² Some consider any unpleasant or unsettling psychedelic experience as an adverse reaction, while others consider it part of the therapeutic process. This is exemplified by the case of vomiting during ayahuasca ceremonies, which is generally considered part of the ritual. In such instances, it is essential to obtain informed consent and ensure participants are aware of these aspects of the experience. Compared to substances such as alcohol, opioids, and cocaine, psychedelics are remarkably safe from a physiological perspective, especially with regards to the risks of toxicity, mortality, and dependence.⁵³ Their psychological safety is less established, and more caution and research is needed. The high incidence of adverse effects and suicidality noted in the recent phase 2 trial of psilocybin in treatment resistant depression are a reminder of this.¹³

There is uncertainty regarding the magnitude of risk in real-world clinical practice, particularly regarding addiction, suicidality, and precipitation or worsening of psychotic disorders. For example, note the extensive exclusion criteria used in the psilocybin vs escitalopram RCT by Carhart-Harris et al¹²: currently or previously diagnosed psychotic disorder, immediate family member with a diagnosed psychotic disorder, significant medical comorbidity (eg, diabetes, epilepsy, severe cardiovascular disease, hepatic or renal failure), history of suicide attempts requiring hospitalization, history of mania, pregnancy, and abnormal QT interval prolongation, among others. It would be prudent to keep these contraindications in mind regarding the clinical use of psychedelics in the future. This is particularly important in older adults because such patients often have substantial medical comorbidities and are at greater risk for adverse effects. For ketamine, research has implicated the role of mu opioid agonism in mediating ketamine’s antidepressant effects.⁵⁴ This raises concerns about abuse, dependence, and addiction, especially with long-term use. There are also concerns regarding protracted withdrawal symptoms and associated suicidality.⁵⁵

The therapeutic use of psychedelics is an exciting and promising avenue, with ongoing research and a rapidly evolving literature. An attitude of cautious optimism is warranted, but efficacy and safety should be demonstrated in well-designed and rigorous trials with adequate long-term follow-up before routine clinical use is recommended.

Bottom Line

In clinical trials for psychiatric disorders, psychedelics have been associated with a range of cognitive, psychiatric, and psychoactive adverse effects but generally have been well-tolerated, with a low incidence of serious adverse effects.

Related Resources

• American Psychiatric Association. Position Statement on the Use of Psychedelic and Empathogenic Agents for Mental Health Conditions. Updated July 2022. Accessed October 24, 2022. https://www.psychiatry.org/getattachment/d5c13619-ca1f-491f-a7a8-b7141c800904/Position-Use-of-Psychedelic-Empathogenic-Agents.pdf
• Johns Hopkins Center for Psychedelic & Consciousness Research. https://hopkinspsychedelic.org/
• Multidisciplinary Association for Psychedelic Studies (MAPS). https://maps.org/

Drug Brand Names

Esketamine • Spravato
Ketamine • Ketalar
Venlafaxine • Effexor

Psychedelics are a class of substances known to produce alterations in consciousness and perception. In the last 2 decades, psychedelic research has garnered increasing attention from scientists, therapists, entrepreneurs, and the public. While many of these compounds remain illegal in the United States and in many parts of the world (Box¹), a recent resurrection of psychedelic research has motivated the FDA to designate multiple psychedelic compounds as “breakthrough therapies,” thereby expediting the investigation, development, and review of psychedelic treatments.

Box

There is growing evidence that psychedelics may be efficacious for treating a range of psychiatric disorders. Potential clinical indications for psychedelics include some forms of depression, posttraumatic stress disorder (PTSD), and substance use disorders (Table 1^2,3). In most instances, the clinical use of psychedelics is being investigated and offered in the context of psychedelic-assisted psychotherapy, though ketamine is a prominent exception. Ketamine and esketamine are already being used to treat depression, and FDA approval is anticipated for other psychedelics. An examination of the safety considerations of psychedelics for the treatment of psychiatric disorders is therefore highly relevant and timely.

This article examines the adverse effect profile of classical (psilocybin [“mushrooms”], lysergic acid diethylamide [LSD], and N,N-dimethyltryptamine [DMT]/ayahuasca) and nonclassical (the entactogen 3,4-methylenedioxymethamphetamine [MDMA, known as “ecstasy”] and the dissociative anesthetic ketamine) psychedelics.

Psilocybin

Psilocybin is typically administered as a single dose of 10 to 30 mg and used in conjunction with preintegration and postintegration psychotherapy. Administration of psilocybin typically produces perceptual distortions and mind-altering effects, which are mediated through 5-HT2A brain receptor agonistic action.⁴ The acute effects last approximately 6 hours.⁵ While psilocybin has generated promising results in early clinical trials,³ the adverse effects of these agents have received less attention.

The adverse effect profile of psilocybin in adults appears promising but its powerful psychoactive effects necessitate cautious use.⁶ It has a very wide therapeutic index, and in a recent meta-analysis of psilocybin for depression, no serious adverse effects were reported in any of the 7 included studies.⁷ Common adverse effects in the context of clinical use include anxiety, dysphoria, confusion, and an increase in blood pressure and heart rate.⁶ Due to potential cardiac effects, psilocybin is contraindicated in individuals with cardiovascular and cerebrovascular disease.⁸ In recreational/nonclinical use, reactions such as suicidality, violence, convulsions, panic attacks, paranoia, confusion, prolonged dissociation, and mania have been reported.^9,10 Animal and human studies indicate the risk of abuse and physical dependence is low. Major national surveys indicate low rates of abuse, treatment-seeking, and harm.¹¹ In a recent 6-week randomized controlled trial (RCT) of psilocybin vs escitalopram for depression,¹² no serious adverse events were reported. Adverse events reported in the psilocybin group in this trial are listed in Table 2.¹²

A recent phase 2 double-blind trial of single-dose psilocybin (1 mg, 10 mg, and 25 mg) for treatment-resistant depression (N = 233) sheds more light on the risk of adverse effects.¹³ The percentage of individuals experiencing adverse effects on Day 1 of administration was high: 61% in the 25 mg psilocybin group. Headache, nausea, fatigue, and dizziness were the most common effects. The incidence of any adverse event in the 25 mg group was 56% from Day 2 to Week 3, and 29% from Week 3 to Week 12. Suicidal ideation, suicidal behavior, or self-injury occurred in all 3 dose groups. Overall, 14% in the 25 mg group, 17% in the 10 mg group, and 9% in the 1 mg group showed worsening of suicidality from baseline to Week 3. Suicidal behavior was reported by 3 individuals in the 25 mg group after Week 3. The new-onset or worsening of preexisting suicidality with psilocybin reported in this study requires further investigation.

Lysergic acid diethylamide

LSD is similar to psilocybin in its agonistic action at the 5-HT2A brain receptors.⁴ It is typically administered as a single 100 to 200 μg dose and is used in conjunction with preintegration and postintegration psychotherapy.¹⁴ Its acute effects last approximately 12 hours.¹⁵

Continue to: Like psilocybin...

Like psilocybin, LSD has a wide therapeutic index. Commonly reported adverse effects of LSD are increased anxiety, dysphoria, and confusion. LSD can also lead to physiological adverse effects, such as increased blood pressure and heart rate, and thus is contraindicated in patients with severe heart disease.⁶ In a systematic review of the therapeutic use of LSD that included 567 participants,¹⁶ 2 cases of serious adverse events were reported: a tonic-clonic seizure in a patient with a prior history of seizures, and a case of prolonged psychosis in a 21-year-old with a history of psychotic disorder.

Though few psychedelic studies have examined the adverse effects of these agents in older adults, a recent phase 1 study that recruited 48 healthy older adults (age 55 to 75) found that, compared to placebo, low doses (5 to 20 μg) of LSD 2 times a week for 3 weeks had similar adverse effects, cognitive impairment, or balance impairment.¹⁷ The only adverse effect noted to be different between the placebo group and active treatment groups was headache (50% for LSD 10 μg, 25% for LSD 20 μg, and 8% for placebo). Because the dose range (5 to 20 μg) used in this study was substantially lower than the typical therapeutic dose range of 100 to 200 μg, these results should not be interpreted as supporting the safety of LSD at higher doses in older adults.

DMT/ayahuasca

Ayahuasca is a plant-based psychedelic that contains an admixture of substances, including DMT, which acts as a 5-HT2A receptor agonist. In addition to DMT, ayahuasca also contains the alkaloid harmaline, which acts as a monoamine inhibitor. Use of ayahuasca can therefore pose a particular risk for individuals taking other serotonergic or noradrenergic medications or substances. The acute effects of DMT last approximately 4 hours,¹⁸ and acute administration of ayahuasca leads to a transient modified state of consciousness that is characterized by introspection, visions, enhanced emotions, and recall of personal memories.¹⁹ Research shows ayahuasca has been dosed at approximately 0.36 mg/kg of DMT for 1 dosing session alongside 6 2-hour therapy sessions.²⁰

A recent review by Orsolini et al²¹ consolidated 40 preclinical, observational, and experimental studies of ayahuasca, and this compound appeared to be safe and well-tolerated; the most common adverse effects were transient emesis and nausea. In an RCT by Palhano-Fontes et al,²⁰ nausea was observed in 71% of participants in the ayahuasca group (vs 26% placebo), vomiting in 57% of participants (vs 0% placebo), and restlessness in 50% of participants (vs 20% placebo). The authors noted that for some participants the ayahuasca session “was not necessarily a pleasant experience,” and was accompanied by psychological distress.²⁰ Vomiting is traditionally viewed as an expected part of the purging process of ayahuasca religious ceremonies. Another review found that there appears to be good long-term tolerability of ayahuasca consumption among individuals who use this compound in religious ceremonies.²²

MDMA

Entactogens (or empathogens) are a class of psychoactive substances that produce experiences of emotional openness and connection. MDMA is an entactogen known to release serotonin, norepinephrine, and dopamine by inhibiting reuptake.²³ This process leads to the stimulation of neurohormonal signaling of oxytocin, cortisol, and other signaling molecules such as brain-derived neurotrophic factor.²⁴ Memory reconsolidation and fear extinction may also play a therapeutic role, enabled by reduced activity in the amygdala and insula, and increased connectivity between the amygdala and hippocampus.²⁴ MDMA has been reported to enhance feelings of well-being and increase prosocial behavior.²⁵ In the therapeutic setting, MDMA has been generally dosed at 75 to 125 mg in 2 to 3 sessions alongside 10 therapy sessions. Administration of MDMA gives the user a subjective experience of energy and distortions in time and perception.²⁶ These acute effects last approximately 2 to 4 hours.²⁷

Continue to: A meta-analysis...

A meta-analysis of 5 RCTs of MDMA-assisted therapy for PTSD in adults demonstrated that MDMA was well-tolerated, and few serious adverse events were reported.²⁸ Two trials from 2018 that were included in this meta-analysis—Mithoefer et al²⁹ and Ot’alora et al³⁰—illustrate the incidence of specific adverse effects. In a randomized, double-blind trial of 26 veterans and first responders with chronic PTSD, Mithoefer et al²⁹ found the most commonly reported reactions during experimental sessions with MDMA were anxiety (81%), headache (69%), fatigue (62%), muscle tension (62%), and jaw clenching or tight jaw (50%). The most commonly reported reactions during 7 days of contact were fatigue (88%), anxiety (73%), insomnia (69%), headache (46%), muscle tension (46%), and increased irritability (46%). One instance of suicidal ideation was severe enough to require psychiatric hospitalization (this was the only instance of suicidal ideation among the 106 patients in the meta-analysis by Bahji et al²⁸); the patient subsequently completed the trial. Transient elevation in pulse, blood pressure, and body temperature were noted during sessions that did not require medical intervention.²⁹ Ot’alora et al³⁰ found similar common adverse reactions: anxiety, dizziness, fatigue, headache, jaw clenching, muscle tension, and irritability. There were no serious adverse effects.

While the use of MDMA in controlled interventional settings has resulted in relatively few adverse events, robust literature describes the risks associated with the nonclinical/recreational use of MDMA. In cases of MDMA toxicity, death has been reported.³¹ Acutely, MDMA may lead to sympathomimetic effects, including serotonin syndrome.³¹ Longer-term studies of MDMA users have found chronic recreational use to be associated with worse sleep, poor mood, anxiety disturbances, memory deficits, and attention problems.³² MDMA has also been found to have moderate potential for abuse.³³

Ketamine/esketamine

Ketamine is a dissociative anesthetic with some hallucinogenic effects. It is an N-methyl-d-aspartate (NMDA) antagonist frequently used in anesthesia, and it can induce a state of sedation, immobility, pain relief, and amnesia. In low doses, ketamine is used off-label to treat major depressive disorder and treatment-resistant depression. Most clinical trials of ketamine for depression have dosed IV ketamine from 0.5 to 1 mg/kg 1 to 3 times a week. It can also be administered as an IM, intranasal, oral, subcutaneous, or sublingual formulation.³⁴

Esketamine, the S(+)-enantiomer of ketamine, is also an NDMA antagonist. It has been developed as an intranasal formulation, typically dosed between 56 and 84 mg 2 times a week for 1 month, once a week for the following month, and once every 1 to 2 weeks thereafter.³⁵ In most ketamine and esketamine trials, these compounds have been used without psychotherapy, although some interventions have integrated psychotherapy with ketamine treatment.³⁶

Bennett et al³⁷ elaborated on 3 paradigms for ketamine treatment: biochemical, psychotherapeutic, and psychedelic. The biochemical model examines the neuro­biological effects of the medication. The psychotherapeutic model views ketamine as a way of assisting the psychotherapy process. The psychedelic model utilizes ketamine’s dissociative and psychedelic properties to induce an altered state of consciousness for therapeutic purposes and psychospiritual exploration.

Continue to: A systematic review...

A systematic review of the common adverse effects associated with ketamine use in clinical trials for depression reported dissociation, sedation, perceptual disturbances, anxiety, agitation, euphoria, hypertension, tachycardia, headache, and dizziness.³⁸ Adverse effects experienced with esketamine in clinical trials include dissociation, dizziness, sedation, hypertension, hypoesthesia, gastrointestinal symptoms, and euphoric mood (Table 3³⁹). A recent systemic review found both ketamine and esketamine demonstrated higher adverse events than control conditions. IV ketamine also demonstrated lower dropouts and adverse events when compared to intranasal esketamine.⁴⁰

Nonclinical/recreational use of ketamine is notable for urinary toxicity; 20% to 30% of frequent users of ketamine experience urinary problems that can range from ketamine-induced cystitis to hydronephrosis and kidney failure.⁴¹ Liver toxicity has also been reported with chronic use of high-dose ketamine. Ketamine is liable to abuse, dependence, and tolerance. There is evidence that nonclinical use of ketamine may lead to morbidity; impairment of memory, cognition, and attention; and urinary, gastric, and hepatic pathology.⁴²

The FDA prescribing information for esketamine lists aneurysmal vascular disease, arteriovenous malformation, and intracerebral hemorrhage as contraindications.³⁹ Patients with cardiovascular and cerebrovascular conditions and risk factors may be at increased risk of adverse effects due to an increase in blood pressure. Esketamine can impair attention, judgment, thinking, reaction speed, and motor skills. Other adverse effects of esketamine noted in the prescribing information include dissociation, dizziness, nausea, sedation, vertigo, hypoesthesia, anxiety, lethargy, vomiting, feeling drunk, and euphoric mood.³⁹A study of postmarketing safety concerns with esketamine using reports submitted to the FDA Adverse Event Reporting System (FAERS) revealed signals for suicidal ideation (reporting odds ratio [ROR] 24.03; 95% CI, 18.72 to 30.84), and completed suicide (ROR 5.75; 95% CI, 3.18 to 10.41).⁴³ The signals for suicidal and self-injurious ideation remained significant when compared to venlafaxine in the FAERS database, while suicide attempts and fatal suicide attempts were no longer significant.⁴³ Concerns regarding acute ketamine withdrawal have also been described in case reports.⁴⁴

Other safety considerations of psychedelics

Hallucinogen persisting perception disorder

Hallucinogen persisting perception disorder (HPPD) is a rare condition associated with hallucinogen use. It is characterized by the recurrence of perceptual disturbances that an individual experienced while using hallucinogenic substances that creates significant distress or impairment.⁴⁵ Because HPPD is a rare disorder, the exact prevalence is not well characterized, but DSM-5 suggests it is approximately 4.2%.⁴⁶ HPPD is associated with numerous psychoactive substances, including psilocybin, ayahuasca, MDMA, and ketamine, but is most associated with LSD.⁴⁵ HPPD is more likely to arise in individuals with histories of psychiatric illness or substance use disorders.⁴⁷

Serotonin toxicity and other serotonergic interactions

Serotonin toxicity is a risk of serotonergic psychedelics, particularly when such agents are used in combination with serotonergic psychotropic medications. The most severe manifestation of serotonin toxicity is serotonin syndrome, which manifests as a life-threatening condition characterized by myoclonus, rigidity, agitation, delirium, and unstable cardiovascular functioning. Many psychedelic compounds have transient serotonin-related adverse effects, but serotonin toxicity due to psychedelic use is rare.⁴⁸ Due to their mechanism of action, classical psychedelics are relatively safe in combination with monoamine oxidase inhibitors (MAOIs) and selective serotonin reuptake inhibitors. MDMA is a serotonin-releasing agent that has a higher risk of serotonin syndrome or hypertensive crisis when used in combination with MAOIs.⁴⁸

Boundary violations in psychedelic-assisted psychotherapy

A key task facing psychedelic research is to establish parameters for the safe and ethical use of these agents. This is particularly relevant given the hype that surrounds the psychedelic resurgence and what we know about the controversial history of these substances. Anderson et al⁴⁹ argued that “psychedelics can have lingering effects that include increased suggestibility and affective instability, as well as altered ego structure, social behaviour, and philosophical worldview. Stated simply, psychedelics can induce a vulnerable state both during and after treatment sessions.”

Continue to: Psychedelic treatment...

Psychedelic treatments such as psilocybin and MDMA are typically offered within the context of psychedelic-assisted psychotherapy, and some researchers have raised concerns regarding boundary violations,⁵⁰ given the patients’ particularly vulnerable states. In addition to concerns about sexual harassment, the financial exploitation of older adults is also a possible risk.⁵¹

Caveats to consider

Novel psychedelics therapies have demonstrated promising preliminary results for a broad range of psychiatric indications, including depression, end-of-life distress, substance use disorders, PTSD, and improving well-being. To date, psychedelics are generally well-tolerated in adults in clinical trials.

However, when it comes to adverse effects, there are challenges in regards to interpreting the psychedelic state.⁵² Some consider any unpleasant or unsettling psychedelic experience as an adverse reaction, while others consider it part of the therapeutic process. This is exemplified by the case of vomiting during ayahuasca ceremonies, which is generally considered part of the ritual. In such instances, it is essential to obtain informed consent and ensure participants are aware of these aspects of the experience. Compared to substances such as alcohol, opioids, and cocaine, psychedelics are remarkably safe from a physiological perspective, especially with regards to the risks of toxicity, mortality, and dependence.⁵³ Their psychological safety is less established, and more caution and research is needed. The high incidence of adverse effects and suicidality noted in the recent phase 2 trial of psilocybin in treatment resistant depression are a reminder of this.¹³

There is uncertainty regarding the magnitude of risk in real-world clinical practice, particularly regarding addiction, suicidality, and precipitation or worsening of psychotic disorders. For example, note the extensive exclusion criteria used in the psilocybin vs escitalopram RCT by Carhart-Harris et al¹²: currently or previously diagnosed psychotic disorder, immediate family member with a diagnosed psychotic disorder, significant medical comorbidity (eg, diabetes, epilepsy, severe cardiovascular disease, hepatic or renal failure), history of suicide attempts requiring hospitalization, history of mania, pregnancy, and abnormal QT interval prolongation, among others. It would be prudent to keep these contraindications in mind regarding the clinical use of psychedelics in the future. This is particularly important in older adults because such patients often have substantial medical comorbidities and are at greater risk for adverse effects. For ketamine, research has implicated the role of mu opioid agonism in mediating ketamine’s antidepressant effects.⁵⁴ This raises concerns about abuse, dependence, and addiction, especially with long-term use. There are also concerns regarding protracted withdrawal symptoms and associated suicidality.⁵⁵

The therapeutic use of psychedelics is an exciting and promising avenue, with ongoing research and a rapidly evolving literature. An attitude of cautious optimism is warranted, but efficacy and safety should be demonstrated in well-designed and rigorous trials with adequate long-term follow-up before routine clinical use is recommended.

Bottom Line

In clinical trials for psychiatric disorders, psychedelics have been associated with a range of cognitive, psychiatric, and psychoactive adverse effects but generally have been well-tolerated, with a low incidence of serious adverse effects.

Related Resources

• American Psychiatric Association. Position Statement on the Use of Psychedelic and Empathogenic Agents for Mental Health Conditions. Updated July 2022. Accessed October 24, 2022. https://www.psychiatry.org/getattachment/d5c13619-ca1f-491f-a7a8-b7141c800904/Position-Use-of-Psychedelic-Empathogenic-Agents.pdf
• Johns Hopkins Center for Psychedelic & Consciousness Research. https://hopkinspsychedelic.org/
• Multidisciplinary Association for Psychedelic Studies (MAPS). https://maps.org/

Drug Brand Names

Esketamine • Spravato
Ketamine • Ketalar
Venlafaxine • Effexor

Resilience has been defined as the ability to adapt and thrive in the face of adversity, acute stress, or trauma.¹ Originally conceived as an inborn trait characteristic, resilience is now conceptualized as a dynamic, multidimensional capacity influenced by the interactions between internal factors (eg, personality, cognitive capacity, physical health) and environmental resources (eg, social status, financial stability).^2,3 Resilience in older adults (typically defined as age ≥65) can improve the prognosis and outcomes for physical and mental conditions.⁴ The construct is closely aligned with “successful aging” and can be fostered in older adults, leading to improved physical and mental health and well-being.⁵

While initially resilience was conceptualized as the opposite of depressive states, recent research has identified resilience in the context of major depressive disorder (MDD) as the net effects of various psychosocial and biological variables that decrease the risk of onset, relapse, or depressive illness severity and increase the probability or speed of recovery.⁶ Late-life depression (LLD) in adults age >65 is a common and debilitating disease, often leading to decreased psychological well-being, increased cognitive decline, and excess mortality.^7,8 LLD is associated with several factors, such as cerebrovascular disease, neurodegenerative disease, and inflammation, all of which could contribute to brain vulnerability and an increased risk of depression.⁹ Physical and cognitive engagement, physical activity, and high brain reserve have been shown to confer resilience to affective and cognitive changes in older adults, despite brain vulnerability.⁹

The greatest levels of resilience have been observed in individuals in their fifth decade of life and later,^4,10 with high levels of resilience significantly contributing to longevity⁵; however, little is known about which factors contribute to heterogeneity in resilience characteristics and outcomes.⁴ Furthermore, the concept of resilience continues to raise numerous questions, including:

• how resilience should be measured or defined
• what factors promote or deter the development of resilience
• the effects of resilience on various health and psychological outcomes
• which interventions are effective in enhancing resilience in older adults.⁴

In this article, we describe resilience in older adults with LLD, its clinical and neurocognitive correlates, and underlying neurobiological and immunological biomarkers. We also examine resilience-building interventions, such as mind-body therapies (MBTs), that have been shown to enhance resilience by promoting positive perceptions of difficult experiences and challenges.

Clinical and neurocognitive correlates of resilience

Resilience varies substantially among older adults with LLD as well as across the lifespan of an individual.¹¹ Identifying clinical components and predictors of resilience may usefully inform the development and testing of interventions to prevent and treat LLD.¹¹ One tool widely used to measure resilience—the self-report Connor-Davidson Resilience Scale (CD-RISC)¹²— has been found to have clinically relevant characteristics.^1,11 Using data from 337 older adults with LLD, Laird et al¹¹ performed an exploratory factor analysis of the CD-RISC and found a 4-factor model:

• grit
• adaptive coping self-efficacy
• accommodative coping self-efficacy
• spirituality.^1,11

Having a strong sense of purpose and not being easily discouraged by failure were items characteristic of grit.^1,11 The preference to take the lead in problem-solving was typical of items loading on adaptive coping self-efficacy, while accommodative coping self-efficacy measured flexibility, cognitive reframing, a sense of humor, and acceptance in the face of uncontrollable stress.^1,11 Finally, the belief that “things happen for a reason” and that “sometimes fate or God can help me” are characteristics of spirituality. ^1,11 Using a multivariate model, the greatest variance in total resilience scores was explained by less depression, less apathy, higher quality of life, non-White race, and, somewhat counterintuitively, greater medical comorbidity.^1,11 Thus, interventions designed to help older adults cultivate grit, active coping, accommodative coping, and spirituality may enhance resilience in LLD.^1,11

Resilience may also be positively associated with cognitive functioning and could be neuroprotective in LLD.¹³ Laird et al¹³ investigated associations between baseline resilience and several domains of neurocognitive functioning in 288 older adults with LLD. Several positive associations were found between measured language performance and total resilience, active coping, and accommodative coping.¹³ Additionally, total resilience and accommodative coping were significantly associated with a lower self-reported frequency of forgetfulness, a subjective measure of memory used in this study.¹³ Together, these results suggest that interventions targeting language might be useful to improve coping in LLD.¹³ Another interesting finding was that the resilience subdomain of spirituality was negatively associated with memory, language, and executive functioning performance.¹³ A distinction must be made between religious attendance (eg, regular attendance at religious institutions) vs religious beliefs, which may account for the previously reported associations between spirituality and improved cognition.¹³

Continue to: Self-reported resilience...

Self-reported resilience may also predict greater responsivity to antidepressant medication in patients with LLD.¹⁴ Older adults with LLD and greater self-reported baseline resilience were more likely to experience improvement or remission from depression with antidepressant treatment.¹⁴ This is congruent with conceptualizations of resilience as “the ability to adapt to and recover from stress.”^14,15 Of the 4 identified resilience factors (grit, adaptive coping, accommodative coping, and spirituality), it appears that accommodative coping predicts LLD treatment response and remission.¹⁴ The unique ability to accommodate is associated with better mental health outcomes in the face of uncontrollable stress.^14,16-18 Older adults appear to engage in more accommodative coping due to frequent uncontrollable stress and aging-related physiological changes (eg, sleep changes, chronic pain, declining cognition). This could make accommodative coping especially important in this population.^14,19

The Figure, adapted from Weisenbach et al,⁹ exhibits factors that contribute to LLD, including cerebrovascular disease, neurodegeneration, and chronic inflammation, all of which can lead to a vulnerable aging brain that is at higher risk for depression, particularly within the context of stress. Clinical and neurocognitive factors associated with resilience can help buffer vulnerable brains from developing depression.

Neurobiological biomarkers of resilience in LLD

Psychobiological consequences can add to existing risk factors and bidirectionally interact to increase health risks, including LLD.⁶ Stress is the primary factor in examining resilience, whether through protective measures or its adverse effects on biological and psychological systems. Resilience is often seen as adaptive maintenance of homeostasis in the face of stress.⁶ Stress and resilience were examined over multiple studies through the lens of several biomarkers, including gross anatomical features, stress response (endocrine, immune, and inflammatory), and cardiovascular indicators.

Gross anatomical indicators: Findings from neuroimaging

The neurobiology underlying psychological resilience involves brain networks associated with stress response, negative affect, and emotional control.¹⁹ Increased amygdala reactivity and amygdala frontal connectivity are often implicated in neurobiological models of resilience.²⁰ Leaver et al²⁰ correlated psychological resilience measures with amygdala function in 48 depressed vs nondepressed individuals using functional magnetic resonance imaging. Specifically, they targeted the basolateral, centromedial, and superficial nuclei groups of the amygdala while comparing the 2 groups based on resilience scores (CD-RISC), depressive symptom severity, and depression status.²⁰ A significant correlation was identified between resilience and connectivity between the superficial group of amygdala nuclei and the ventral default mode network (VDMN).²⁰ High levels of psychological resilience were associated with lower basal amygdala activity and decreased connectivity between amygdala nuclei and the VDMN.²⁰ Additionally, lower depressive symptoms were associated with higher connectivity between the amygdalae and the dorsal frontal networks.²⁰ These results suggest a complex relationship between amygdala activity, dorsal frontal regions, resilience, and LLD.²⁰

Vlasova et al²¹ further addressed the multi­factorial character of psychological resilience. The associations between the 4 factors of resilience and the regional integrity of white matter in older adults with LLD were examined using diffusion-weighted MRI.²¹ Grit was found to be associated with greater white matter integrity in the genu of the corpus callosum and cingulum bundle in LLD.²¹ There was also a positive association between grit and fractional anisotropy (FA) in the callosal region connecting the prefrontal cortex and FA in the cingulum fibers.²¹ However, results regarding the FA in the cingulum fibers did not survive correction for multiple comparisons and should be considered with caution, pending further research.²¹

Continue to: Stress response biomarkers of resilience

Stress response biomarkers include endocrine, immune, and inflammatory indices. Stress has been identified as a factor in inflammatory responses. Stress-related overstimulation of the HPA axis may increase the risk of LLD.²² Numerous studies have demonstrated an association between increased levels of peripheral proinflammatory cytokines and depressive symptoms in older adults.²³ Interleukin-6 (IL-6) has been increasingly linked with depressive symptoms and poor memory performance in older adults.⁹ There also appears to be an interaction of inflammatory and vascular processes predisposing to LLD, as increased levels of IL-6 and C-reactive protein have been associated with higher white matter pathology.⁹ Additionally, proinflammatory cytokines impact monoamine neurotransmitter pathways, leading to a reduction in tryptophan and serotonin synthesis, disruption of glucocorticoid receptors, and a decrease in hippocampal neurotrophic support.⁹ Alexopoulos et al²⁴ further explain that a prolonged CNS immune response can affect emotional and cognitive network functions related to LLD and has a role in the etiology of depressive symptoms in older adults.

Cardiovascular comorbidity and autonomic nervous system dysfunction

Many studies have revealed evidence of a bidirectional association between cardio­vascular disease and depression.²⁵ Dysregulation of the autonomic nervous system (ANS) is an underlying mechanism that could explain the link between cardiovascular risk and MDD via heart rate variability (HRV), though research examining age-related capacities provide conflicting data.^25,26 HRV is a surrogate index of resting cardiac vagal outflow that represents the ability of the ANS to adapt to psychological, social, and physical environmental changes.²⁷ Higher overall HRV is associated with greater self-regulating capacity, including behavioral, cognitive, and emotional control.²⁸ Additionally, higher HRV may serve as a biomarker of resilience to the development of stress-related disorders such as MDD. Recent studies have shown an overall reduction in HRV in older adults with LLD.²⁹ When high- and low-frequency HRV were investigated separately, only low-frequency HRV was significantly reduced in patients with depression.²⁹ One explanation is that older adults with depression have impaired or reduced baroreflex sensitivity and gain, which is often associated with an increased risk of mortality following cardiac events.³⁰ More research is needed to examine the complex processes required to better characterize the correlation between resilience in cardiovascular disease and autonomic dysfunction.

The Box^6,31,32 describes the relationship between markers of cellular health and resilience.

Box

Mind-body therapies

There is increasing interest in improving older adults’ physical and emotional well-being while promoting resilience through stress-reducing lifestyle interventions such as MBTs.³³ Because MBTs are often considered a natural and safer option compared to conventional medicine, these interventions are rapidly gaining popularity in the United States.^33,34 According to a 2017 National Health Survey, there were 5% to 10% increases in the use of yoga, meditation, and chiropractic care from 2012 to 2017, with growing evidence supporting MBTs as minimally invasive, cost-effective approaches for managing stress and neurocognitive disorders.³⁵ In contrast to pharmacologic approaches, MBTs can be used to train individuals to self-regulate in the face of adversity and stress, thus increasing their resilience.

MBTs can be divided into mindful movement exercises and meditative practices. Mindful movement exercises include yoga, tai chi, and qigong. Meditative practices that do not include movement include progressive relaxation, mindfulness, meditation, and acceptance therapies. On average, both mindful movement exercise (eg, yoga) and multicomponent mindfulness-based interventions (eg, mindfulness-based cognitive therapy, mindfulness-based stress reduction [MBSR], and mindfulness-based relapse prevention) can be as effective as other active treatments for psychiatric disorders such as MDD, anxiety, and substance use disorders.^36,37 MBSR specifically has been shown to increase empathy, self-control, self-compassion, relationship quality, mindfulness, and spirituality as well as decrease rumination in healthy older adults.³⁸ This suggests that MBSR can help strengthen the 4 factors of resilience.

Continue to: Research has also begun...

Research has also begun to evaluate the neurobiological mechanisms by which meditative therapies enhance resilience in mental health disorders, and several promising mechanistic domains (neural, hormonal, immune, cellular, and cardiovascular) have been identified.³⁹ The physical yoga discipline includes asanas (postures), pranayama (breathing techniques), and dhyana (meditation). With the inclusion of mindfulness training, yoga involves the practice of meditation as well as the dynamic combination of proprioceptive and interoceptive awareness, resulting in both attention and profound focus.⁴⁰ Dedicated yoga practice allows an individual to develop skills to withdraw the senses (pratyahara), concentrate the mind (dharana), and establish unwavering awareness (dhyana).⁴¹ The physical and cognitive benefits associated with yoga and mindfulness may be due to mechanisms including pranayama and activation of the parasympathetic nervous system; meditative or contemplative practices; increased body perception; stronger functional connectivity within the basal ganglia; or neuroplastic effects of increased grey matter volume and amygdala with regional enlargement.⁴¹ The new learning aspect of yoga practice may contribute to enhancing or improving various aspects of cognition, although the mechanisms are yet to be clarified.

Continued research in this area will promote the integration of MBTs into mainstream clinical practice and help alleviate the increased chronic health burden of an aging population. In the face of the COVID-19 pandemic, public interest in improving resilience and mental health⁴² can be supported by MBTs that can improve coping with the stress of the pandemic and enhance critical organ function (eg, lungs, heart, brain).^43,44 As a result of these limitations, many resources and health care services have used telehealth and virtual platforms to adapt to these challenges and continue offering MBTs.⁴⁵

Enhancing resilience to improve clinical outcomes

Increasing our understanding of clinical, neurocognitive, and neurobiological markers of resilience in older adults with and without depression could inform the development of interventions that treat and prevent mood and cognitive disorders of aging. Furthermore, stress reduction, decreased inflammation, and improved emotional regulation may have direct neuroplastic effects on the brain, leading to greater resilience. Complementary use of MBTs combined with standard antidepressant treatment may allow for additional improvement in clinical outcomes of LLD, including resilience, quality of life, general health, and cognitive function. Additional research testing the efficacy of those interventions designed to improve resilience in older adults with mood and mental disorders is needed.

Bottom Line

Identifying the clinical, neurocognitive, and neurobiological biomarkers of resilience in late-life depression could aid in the development of targeted interventions that treat and prevent mood and cognitive disorders of aging. Mind-body interventions can help boost resilience and improve outcomes in geriatric patients with mood and cognitive disorders.

Related Resources

• Lavretsky H. Resilience and Aging: Research and Practice. Johns Hopkins University Press; 2014.
• Lavretsky H, Sajatovic M, Reynolds CF, eds. Complementary and Integrative Therapies for Mental Health and Aging. Oxford University Press; 2016.
• Eyre HA, Berk M, Lavretsky H, et al, eds. Convergence Mental Health: A Transdisciplinary Approach to Innovation. Oxford University Press; 2021.
• UCLA Jane & Terry Semel Institute for Neuroscience & Human Behavior. Late-life Depression, Stress, and Wellness Research Program. https://www.semel.ucla.edu/latelife

Resilience has been defined as the ability to adapt and thrive in the face of adversity, acute stress, or trauma.¹ Originally conceived as an inborn trait characteristic, resilience is now conceptualized as a dynamic, multidimensional capacity influenced by the interactions between internal factors (eg, personality, cognitive capacity, physical health) and environmental resources (eg, social status, financial stability).^2,3 Resilience in older adults (typically defined as age ≥65) can improve the prognosis and outcomes for physical and mental conditions.⁴ The construct is closely aligned with “successful aging” and can be fostered in older adults, leading to improved physical and mental health and well-being.⁵

While initially resilience was conceptualized as the opposite of depressive states, recent research has identified resilience in the context of major depressive disorder (MDD) as the net effects of various psychosocial and biological variables that decrease the risk of onset, relapse, or depressive illness severity and increase the probability or speed of recovery.⁶ Late-life depression (LLD) in adults age >65 is a common and debilitating disease, often leading to decreased psychological well-being, increased cognitive decline, and excess mortality.^7,8 LLD is associated with several factors, such as cerebrovascular disease, neurodegenerative disease, and inflammation, all of which could contribute to brain vulnerability and an increased risk of depression.⁹ Physical and cognitive engagement, physical activity, and high brain reserve have been shown to confer resilience to affective and cognitive changes in older adults, despite brain vulnerability.⁹

The greatest levels of resilience have been observed in individuals in their fifth decade of life and later,^4,10 with high levels of resilience significantly contributing to longevity⁵; however, little is known about which factors contribute to heterogeneity in resilience characteristics and outcomes.⁴ Furthermore, the concept of resilience continues to raise numerous questions, including:

• how resilience should be measured or defined
• what factors promote or deter the development of resilience
• the effects of resilience on various health and psychological outcomes
• which interventions are effective in enhancing resilience in older adults.⁴

In this article, we describe resilience in older adults with LLD, its clinical and neurocognitive correlates, and underlying neurobiological and immunological biomarkers. We also examine resilience-building interventions, such as mind-body therapies (MBTs), that have been shown to enhance resilience by promoting positive perceptions of difficult experiences and challenges.

Clinical and neurocognitive correlates of resilience

Resilience varies substantially among older adults with LLD as well as across the lifespan of an individual.¹¹ Identifying clinical components and predictors of resilience may usefully inform the development and testing of interventions to prevent and treat LLD.¹¹ One tool widely used to measure resilience—the self-report Connor-Davidson Resilience Scale (CD-RISC)¹²— has been found to have clinically relevant characteristics.^1,11 Using data from 337 older adults with LLD, Laird et al¹¹ performed an exploratory factor analysis of the CD-RISC and found a 4-factor model:

• grit
• adaptive coping self-efficacy
• accommodative coping self-efficacy
• spirituality.^1,11

Having a strong sense of purpose and not being easily discouraged by failure were items characteristic of grit.^1,11 The preference to take the lead in problem-solving was typical of items loading on adaptive coping self-efficacy, while accommodative coping self-efficacy measured flexibility, cognitive reframing, a sense of humor, and acceptance in the face of uncontrollable stress.^1,11 Finally, the belief that “things happen for a reason” and that “sometimes fate or God can help me” are characteristics of spirituality. ^1,11 Using a multivariate model, the greatest variance in total resilience scores was explained by less depression, less apathy, higher quality of life, non-White race, and, somewhat counterintuitively, greater medical comorbidity.^1,11 Thus, interventions designed to help older adults cultivate grit, active coping, accommodative coping, and spirituality may enhance resilience in LLD.^1,11

Resilience may also be positively associated with cognitive functioning and could be neuroprotective in LLD.¹³ Laird et al¹³ investigated associations between baseline resilience and several domains of neurocognitive functioning in 288 older adults with LLD. Several positive associations were found between measured language performance and total resilience, active coping, and accommodative coping.¹³ Additionally, total resilience and accommodative coping were significantly associated with a lower self-reported frequency of forgetfulness, a subjective measure of memory used in this study.¹³ Together, these results suggest that interventions targeting language might be useful to improve coping in LLD.¹³ Another interesting finding was that the resilience subdomain of spirituality was negatively associated with memory, language, and executive functioning performance.¹³ A distinction must be made between religious attendance (eg, regular attendance at religious institutions) vs religious beliefs, which may account for the previously reported associations between spirituality and improved cognition.¹³

Continue to: Self-reported resilience...

Self-reported resilience may also predict greater responsivity to antidepressant medication in patients with LLD.¹⁴ Older adults with LLD and greater self-reported baseline resilience were more likely to experience improvement or remission from depression with antidepressant treatment.¹⁴ This is congruent with conceptualizations of resilience as “the ability to adapt to and recover from stress.”^14,15 Of the 4 identified resilience factors (grit, adaptive coping, accommodative coping, and spirituality), it appears that accommodative coping predicts LLD treatment response and remission.¹⁴ The unique ability to accommodate is associated with better mental health outcomes in the face of uncontrollable stress.^14,16-18 Older adults appear to engage in more accommodative coping due to frequent uncontrollable stress and aging-related physiological changes (eg, sleep changes, chronic pain, declining cognition). This could make accommodative coping especially important in this population.^14,19

The Figure, adapted from Weisenbach et al,⁹ exhibits factors that contribute to LLD, including cerebrovascular disease, neurodegeneration, and chronic inflammation, all of which can lead to a vulnerable aging brain that is at higher risk for depression, particularly within the context of stress. Clinical and neurocognitive factors associated with resilience can help buffer vulnerable brains from developing depression.

Neurobiological biomarkers of resilience in LLD

Psychobiological consequences can add to existing risk factors and bidirectionally interact to increase health risks, including LLD.⁶ Stress is the primary factor in examining resilience, whether through protective measures or its adverse effects on biological and psychological systems. Resilience is often seen as adaptive maintenance of homeostasis in the face of stress.⁶ Stress and resilience were examined over multiple studies through the lens of several biomarkers, including gross anatomical features, stress response (endocrine, immune, and inflammatory), and cardiovascular indicators.

Gross anatomical indicators: Findings from neuroimaging

The neurobiology underlying psychological resilience involves brain networks associated with stress response, negative affect, and emotional control.¹⁹ Increased amygdala reactivity and amygdala frontal connectivity are often implicated in neurobiological models of resilience.²⁰ Leaver et al²⁰ correlated psychological resilience measures with amygdala function in 48 depressed vs nondepressed individuals using functional magnetic resonance imaging. Specifically, they targeted the basolateral, centromedial, and superficial nuclei groups of the amygdala while comparing the 2 groups based on resilience scores (CD-RISC), depressive symptom severity, and depression status.²⁰ A significant correlation was identified between resilience and connectivity between the superficial group of amygdala nuclei and the ventral default mode network (VDMN).²⁰ High levels of psychological resilience were associated with lower basal amygdala activity and decreased connectivity between amygdala nuclei and the VDMN.²⁰ Additionally, lower depressive symptoms were associated with higher connectivity between the amygdalae and the dorsal frontal networks.²⁰ These results suggest a complex relationship between amygdala activity, dorsal frontal regions, resilience, and LLD.²⁰

Vlasova et al²¹ further addressed the multi­factorial character of psychological resilience. The associations between the 4 factors of resilience and the regional integrity of white matter in older adults with LLD were examined using diffusion-weighted MRI.²¹ Grit was found to be associated with greater white matter integrity in the genu of the corpus callosum and cingulum bundle in LLD.²¹ There was also a positive association between grit and fractional anisotropy (FA) in the callosal region connecting the prefrontal cortex and FA in the cingulum fibers.²¹ However, results regarding the FA in the cingulum fibers did not survive correction for multiple comparisons and should be considered with caution, pending further research.²¹

Continue to: Stress response biomarkers of resilience

Stress response biomarkers include endocrine, immune, and inflammatory indices. Stress has been identified as a factor in inflammatory responses. Stress-related overstimulation of the HPA axis may increase the risk of LLD.²² Numerous studies have demonstrated an association between increased levels of peripheral proinflammatory cytokines and depressive symptoms in older adults.²³ Interleukin-6 (IL-6) has been increasingly linked with depressive symptoms and poor memory performance in older adults.⁹ There also appears to be an interaction of inflammatory and vascular processes predisposing to LLD, as increased levels of IL-6 and C-reactive protein have been associated with higher white matter pathology.⁹ Additionally, proinflammatory cytokines impact monoamine neurotransmitter pathways, leading to a reduction in tryptophan and serotonin synthesis, disruption of glucocorticoid receptors, and a decrease in hippocampal neurotrophic support.⁹ Alexopoulos et al²⁴ further explain that a prolonged CNS immune response can affect emotional and cognitive network functions related to LLD and has a role in the etiology of depressive symptoms in older adults.

Cardiovascular comorbidity and autonomic nervous system dysfunction

Many studies have revealed evidence of a bidirectional association between cardio­vascular disease and depression.²⁵ Dysregulation of the autonomic nervous system (ANS) is an underlying mechanism that could explain the link between cardiovascular risk and MDD via heart rate variability (HRV), though research examining age-related capacities provide conflicting data.^25,26 HRV is a surrogate index of resting cardiac vagal outflow that represents the ability of the ANS to adapt to psychological, social, and physical environmental changes.²⁷ Higher overall HRV is associated with greater self-regulating capacity, including behavioral, cognitive, and emotional control.²⁸ Additionally, higher HRV may serve as a biomarker of resilience to the development of stress-related disorders such as MDD. Recent studies have shown an overall reduction in HRV in older adults with LLD.²⁹ When high- and low-frequency HRV were investigated separately, only low-frequency HRV was significantly reduced in patients with depression.²⁹ One explanation is that older adults with depression have impaired or reduced baroreflex sensitivity and gain, which is often associated with an increased risk of mortality following cardiac events.³⁰ More research is needed to examine the complex processes required to better characterize the correlation between resilience in cardiovascular disease and autonomic dysfunction.

The Box^6,31,32 describes the relationship between markers of cellular health and resilience.

Box

Mind-body therapies

There is increasing interest in improving older adults’ physical and emotional well-being while promoting resilience through stress-reducing lifestyle interventions such as MBTs.³³ Because MBTs are often considered a natural and safer option compared to conventional medicine, these interventions are rapidly gaining popularity in the United States.^33,34 According to a 2017 National Health Survey, there were 5% to 10% increases in the use of yoga, meditation, and chiropractic care from 2012 to 2017, with growing evidence supporting MBTs as minimally invasive, cost-effective approaches for managing stress and neurocognitive disorders.³⁵ In contrast to pharmacologic approaches, MBTs can be used to train individuals to self-regulate in the face of adversity and stress, thus increasing their resilience.

MBTs can be divided into mindful movement exercises and meditative practices. Mindful movement exercises include yoga, tai chi, and qigong. Meditative practices that do not include movement include progressive relaxation, mindfulness, meditation, and acceptance therapies. On average, both mindful movement exercise (eg, yoga) and multicomponent mindfulness-based interventions (eg, mindfulness-based cognitive therapy, mindfulness-based stress reduction [MBSR], and mindfulness-based relapse prevention) can be as effective as other active treatments for psychiatric disorders such as MDD, anxiety, and substance use disorders.^36,37 MBSR specifically has been shown to increase empathy, self-control, self-compassion, relationship quality, mindfulness, and spirituality as well as decrease rumination in healthy older adults.³⁸ This suggests that MBSR can help strengthen the 4 factors of resilience.

Continue to: Research has also begun...

Research has also begun to evaluate the neurobiological mechanisms by which meditative therapies enhance resilience in mental health disorders, and several promising mechanistic domains (neural, hormonal, immune, cellular, and cardiovascular) have been identified.³⁹ The physical yoga discipline includes asanas (postures), pranayama (breathing techniques), and dhyana (meditation). With the inclusion of mindfulness training, yoga involves the practice of meditation as well as the dynamic combination of proprioceptive and interoceptive awareness, resulting in both attention and profound focus.⁴⁰ Dedicated yoga practice allows an individual to develop skills to withdraw the senses (pratyahara), concentrate the mind (dharana), and establish unwavering awareness (dhyana).⁴¹ The physical and cognitive benefits associated with yoga and mindfulness may be due to mechanisms including pranayama and activation of the parasympathetic nervous system; meditative or contemplative practices; increased body perception; stronger functional connectivity within the basal ganglia; or neuroplastic effects of increased grey matter volume and amygdala with regional enlargement.⁴¹ The new learning aspect of yoga practice may contribute to enhancing or improving various aspects of cognition, although the mechanisms are yet to be clarified.

Continued research in this area will promote the integration of MBTs into mainstream clinical practice and help alleviate the increased chronic health burden of an aging population. In the face of the COVID-19 pandemic, public interest in improving resilience and mental health⁴² can be supported by MBTs that can improve coping with the stress of the pandemic and enhance critical organ function (eg, lungs, heart, brain).^43,44 As a result of these limitations, many resources and health care services have used telehealth and virtual platforms to adapt to these challenges and continue offering MBTs.⁴⁵

Enhancing resilience to improve clinical outcomes

Increasing our understanding of clinical, neurocognitive, and neurobiological markers of resilience in older adults with and without depression could inform the development of interventions that treat and prevent mood and cognitive disorders of aging. Furthermore, stress reduction, decreased inflammation, and improved emotional regulation may have direct neuroplastic effects on the brain, leading to greater resilience. Complementary use of MBTs combined with standard antidepressant treatment may allow for additional improvement in clinical outcomes of LLD, including resilience, quality of life, general health, and cognitive function. Additional research testing the efficacy of those interventions designed to improve resilience in older adults with mood and mental disorders is needed.

Bottom Line

Identifying the clinical, neurocognitive, and neurobiological biomarkers of resilience in late-life depression could aid in the development of targeted interventions that treat and prevent mood and cognitive disorders of aging. Mind-body interventions can help boost resilience and improve outcomes in geriatric patients with mood and cognitive disorders.

Related Resources

• Lavretsky H. Resilience and Aging: Research and Practice. Johns Hopkins University Press; 2014.
• Lavretsky H, Sajatovic M, Reynolds CF, eds. Complementary and Integrative Therapies for Mental Health and Aging. Oxford University Press; 2016.
• Eyre HA, Berk M, Lavretsky H, et al, eds. Convergence Mental Health: A Transdisciplinary Approach to Innovation. Oxford University Press; 2021.
• UCLA Jane & Terry Semel Institute for Neuroscience & Human Behavior. Late-life Depression, Stress, and Wellness Research Program. https://www.semel.ucla.edu/latelife

Resilience has been defined as the ability to adapt and thrive in the face of adversity, acute stress, or trauma.¹ Originally conceived as an inborn trait characteristic, resilience is now conceptualized as a dynamic, multidimensional capacity influenced by the interactions between internal factors (eg, personality, cognitive capacity, physical health) and environmental resources (eg, social status, financial stability).^2,3 Resilience in older adults (typically defined as age ≥65) can improve the prognosis and outcomes for physical and mental conditions.⁴ The construct is closely aligned with “successful aging” and can be fostered in older adults, leading to improved physical and mental health and well-being.⁵

While initially resilience was conceptualized as the opposite of depressive states, recent research has identified resilience in the context of major depressive disorder (MDD) as the net effects of various psychosocial and biological variables that decrease the risk of onset, relapse, or depressive illness severity and increase the probability or speed of recovery.⁶ Late-life depression (LLD) in adults age >65 is a common and debilitating disease, often leading to decreased psychological well-being, increased cognitive decline, and excess mortality.^7,8 LLD is associated with several factors, such as cerebrovascular disease, neurodegenerative disease, and inflammation, all of which could contribute to brain vulnerability and an increased risk of depression.⁹ Physical and cognitive engagement, physical activity, and high brain reserve have been shown to confer resilience to affective and cognitive changes in older adults, despite brain vulnerability.⁹

The greatest levels of resilience have been observed in individuals in their fifth decade of life and later,^4,10 with high levels of resilience significantly contributing to longevity⁵; however, little is known about which factors contribute to heterogeneity in resilience characteristics and outcomes.⁴ Furthermore, the concept of resilience continues to raise numerous questions, including:

• how resilience should be measured or defined
• what factors promote or deter the development of resilience
• the effects of resilience on various health and psychological outcomes
• which interventions are effective in enhancing resilience in older adults.⁴

In this article, we describe resilience in older adults with LLD, its clinical and neurocognitive correlates, and underlying neurobiological and immunological biomarkers. We also examine resilience-building interventions, such as mind-body therapies (MBTs), that have been shown to enhance resilience by promoting positive perceptions of difficult experiences and challenges.

Clinical and neurocognitive correlates of resilience

Resilience varies substantially among older adults with LLD as well as across the lifespan of an individual.¹¹ Identifying clinical components and predictors of resilience may usefully inform the development and testing of interventions to prevent and treat LLD.¹¹ One tool widely used to measure resilience—the self-report Connor-Davidson Resilience Scale (CD-RISC)¹²— has been found to have clinically relevant characteristics.^1,11 Using data from 337 older adults with LLD, Laird et al¹¹ performed an exploratory factor analysis of the CD-RISC and found a 4-factor model:

• grit
• adaptive coping self-efficacy
• accommodative coping self-efficacy
• spirituality.^1,11

Having a strong sense of purpose and not being easily discouraged by failure were items characteristic of grit.^1,11 The preference to take the lead in problem-solving was typical of items loading on adaptive coping self-efficacy, while accommodative coping self-efficacy measured flexibility, cognitive reframing, a sense of humor, and acceptance in the face of uncontrollable stress.^1,11 Finally, the belief that “things happen for a reason” and that “sometimes fate or God can help me” are characteristics of spirituality. ^1,11 Using a multivariate model, the greatest variance in total resilience scores was explained by less depression, less apathy, higher quality of life, non-White race, and, somewhat counterintuitively, greater medical comorbidity.^1,11 Thus, interventions designed to help older adults cultivate grit, active coping, accommodative coping, and spirituality may enhance resilience in LLD.^1,11

Resilience may also be positively associated with cognitive functioning and could be neuroprotective in LLD.¹³ Laird et al¹³ investigated associations between baseline resilience and several domains of neurocognitive functioning in 288 older adults with LLD. Several positive associations were found between measured language performance and total resilience, active coping, and accommodative coping.¹³ Additionally, total resilience and accommodative coping were significantly associated with a lower self-reported frequency of forgetfulness, a subjective measure of memory used in this study.¹³ Together, these results suggest that interventions targeting language might be useful to improve coping in LLD.¹³ Another interesting finding was that the resilience subdomain of spirituality was negatively associated with memory, language, and executive functioning performance.¹³ A distinction must be made between religious attendance (eg, regular attendance at religious institutions) vs religious beliefs, which may account for the previously reported associations between spirituality and improved cognition.¹³

Continue to: Self-reported resilience...

Self-reported resilience may also predict greater responsivity to antidepressant medication in patients with LLD.¹⁴ Older adults with LLD and greater self-reported baseline resilience were more likely to experience improvement or remission from depression with antidepressant treatment.¹⁴ This is congruent with conceptualizations of resilience as “the ability to adapt to and recover from stress.”^14,15 Of the 4 identified resilience factors (grit, adaptive coping, accommodative coping, and spirituality), it appears that accommodative coping predicts LLD treatment response and remission.¹⁴ The unique ability to accommodate is associated with better mental health outcomes in the face of uncontrollable stress.^14,16-18 Older adults appear to engage in more accommodative coping due to frequent uncontrollable stress and aging-related physiological changes (eg, sleep changes, chronic pain, declining cognition). This could make accommodative coping especially important in this population.^14,19

The Figure, adapted from Weisenbach et al,⁹ exhibits factors that contribute to LLD, including cerebrovascular disease, neurodegeneration, and chronic inflammation, all of which can lead to a vulnerable aging brain that is at higher risk for depression, particularly within the context of stress. Clinical and neurocognitive factors associated with resilience can help buffer vulnerable brains from developing depression.

Neurobiological biomarkers of resilience in LLD

Psychobiological consequences can add to existing risk factors and bidirectionally interact to increase health risks, including LLD.⁶ Stress is the primary factor in examining resilience, whether through protective measures or its adverse effects on biological and psychological systems. Resilience is often seen as adaptive maintenance of homeostasis in the face of stress.⁶ Stress and resilience were examined over multiple studies through the lens of several biomarkers, including gross anatomical features, stress response (endocrine, immune, and inflammatory), and cardiovascular indicators.

Gross anatomical indicators: Findings from neuroimaging

The neurobiology underlying psychological resilience involves brain networks associated with stress response, negative affect, and emotional control.¹⁹ Increased amygdala reactivity and amygdala frontal connectivity are often implicated in neurobiological models of resilience.²⁰ Leaver et al²⁰ correlated psychological resilience measures with amygdala function in 48 depressed vs nondepressed individuals using functional magnetic resonance imaging. Specifically, they targeted the basolateral, centromedial, and superficial nuclei groups of the amygdala while comparing the 2 groups based on resilience scores (CD-RISC), depressive symptom severity, and depression status.²⁰ A significant correlation was identified between resilience and connectivity between the superficial group of amygdala nuclei and the ventral default mode network (VDMN).²⁰ High levels of psychological resilience were associated with lower basal amygdala activity and decreased connectivity between amygdala nuclei and the VDMN.²⁰ Additionally, lower depressive symptoms were associated with higher connectivity between the amygdalae and the dorsal frontal networks.²⁰ These results suggest a complex relationship between amygdala activity, dorsal frontal regions, resilience, and LLD.²⁰

Vlasova et al²¹ further addressed the multi­factorial character of psychological resilience. The associations between the 4 factors of resilience and the regional integrity of white matter in older adults with LLD were examined using diffusion-weighted MRI.²¹ Grit was found to be associated with greater white matter integrity in the genu of the corpus callosum and cingulum bundle in LLD.²¹ There was also a positive association between grit and fractional anisotropy (FA) in the callosal region connecting the prefrontal cortex and FA in the cingulum fibers.²¹ However, results regarding the FA in the cingulum fibers did not survive correction for multiple comparisons and should be considered with caution, pending further research.²¹

Continue to: Stress response biomarkers of resilience

Stress response biomarkers include endocrine, immune, and inflammatory indices. Stress has been identified as a factor in inflammatory responses. Stress-related overstimulation of the HPA axis may increase the risk of LLD.²² Numerous studies have demonstrated an association between increased levels of peripheral proinflammatory cytokines and depressive symptoms in older adults.²³ Interleukin-6 (IL-6) has been increasingly linked with depressive symptoms and poor memory performance in older adults.⁹ There also appears to be an interaction of inflammatory and vascular processes predisposing to LLD, as increased levels of IL-6 and C-reactive protein have been associated with higher white matter pathology.⁹ Additionally, proinflammatory cytokines impact monoamine neurotransmitter pathways, leading to a reduction in tryptophan and serotonin synthesis, disruption of glucocorticoid receptors, and a decrease in hippocampal neurotrophic support.⁹ Alexopoulos et al²⁴ further explain that a prolonged CNS immune response can affect emotional and cognitive network functions related to LLD and has a role in the etiology of depressive symptoms in older adults.

Cardiovascular comorbidity and autonomic nervous system dysfunction

Many studies have revealed evidence of a bidirectional association between cardio­vascular disease and depression.²⁵ Dysregulation of the autonomic nervous system (ANS) is an underlying mechanism that could explain the link between cardiovascular risk and MDD via heart rate variability (HRV), though research examining age-related capacities provide conflicting data.^25,26 HRV is a surrogate index of resting cardiac vagal outflow that represents the ability of the ANS to adapt to psychological, social, and physical environmental changes.²⁷ Higher overall HRV is associated with greater self-regulating capacity, including behavioral, cognitive, and emotional control.²⁸ Additionally, higher HRV may serve as a biomarker of resilience to the development of stress-related disorders such as MDD. Recent studies have shown an overall reduction in HRV in older adults with LLD.²⁹ When high- and low-frequency HRV were investigated separately, only low-frequency HRV was significantly reduced in patients with depression.²⁹ One explanation is that older adults with depression have impaired or reduced baroreflex sensitivity and gain, which is often associated with an increased risk of mortality following cardiac events.³⁰ More research is needed to examine the complex processes required to better characterize the correlation between resilience in cardiovascular disease and autonomic dysfunction.

The Box^6,31,32 describes the relationship between markers of cellular health and resilience.

Box

Mind-body therapies

There is increasing interest in improving older adults’ physical and emotional well-being while promoting resilience through stress-reducing lifestyle interventions such as MBTs.³³ Because MBTs are often considered a natural and safer option compared to conventional medicine, these interventions are rapidly gaining popularity in the United States.^33,34 According to a 2017 National Health Survey, there were 5% to 10% increases in the use of yoga, meditation, and chiropractic care from 2012 to 2017, with growing evidence supporting MBTs as minimally invasive, cost-effective approaches for managing stress and neurocognitive disorders.³⁵ In contrast to pharmacologic approaches, MBTs can be used to train individuals to self-regulate in the face of adversity and stress, thus increasing their resilience.

MBTs can be divided into mindful movement exercises and meditative practices. Mindful movement exercises include yoga, tai chi, and qigong. Meditative practices that do not include movement include progressive relaxation, mindfulness, meditation, and acceptance therapies. On average, both mindful movement exercise (eg, yoga) and multicomponent mindfulness-based interventions (eg, mindfulness-based cognitive therapy, mindfulness-based stress reduction [MBSR], and mindfulness-based relapse prevention) can be as effective as other active treatments for psychiatric disorders such as MDD, anxiety, and substance use disorders.^36,37 MBSR specifically has been shown to increase empathy, self-control, self-compassion, relationship quality, mindfulness, and spirituality as well as decrease rumination in healthy older adults.³⁸ This suggests that MBSR can help strengthen the 4 factors of resilience.

Continue to: Research has also begun...

Research has also begun to evaluate the neurobiological mechanisms by which meditative therapies enhance resilience in mental health disorders, and several promising mechanistic domains (neural, hormonal, immune, cellular, and cardiovascular) have been identified.³⁹ The physical yoga discipline includes asanas (postures), pranayama (breathing techniques), and dhyana (meditation). With the inclusion of mindfulness training, yoga involves the practice of meditation as well as the dynamic combination of proprioceptive and interoceptive awareness, resulting in both attention and profound focus.⁴⁰ Dedicated yoga practice allows an individual to develop skills to withdraw the senses (pratyahara), concentrate the mind (dharana), and establish unwavering awareness (dhyana).⁴¹ The physical and cognitive benefits associated with yoga and mindfulness may be due to mechanisms including pranayama and activation of the parasympathetic nervous system; meditative or contemplative practices; increased body perception; stronger functional connectivity within the basal ganglia; or neuroplastic effects of increased grey matter volume and amygdala with regional enlargement.⁴¹ The new learning aspect of yoga practice may contribute to enhancing or improving various aspects of cognition, although the mechanisms are yet to be clarified.

Continued research in this area will promote the integration of MBTs into mainstream clinical practice and help alleviate the increased chronic health burden of an aging population. In the face of the COVID-19 pandemic, public interest in improving resilience and mental health⁴² can be supported by MBTs that can improve coping with the stress of the pandemic and enhance critical organ function (eg, lungs, heart, brain).^43,44 As a result of these limitations, many resources and health care services have used telehealth and virtual platforms to adapt to these challenges and continue offering MBTs.⁴⁵

Enhancing resilience to improve clinical outcomes

Increasing our understanding of clinical, neurocognitive, and neurobiological markers of resilience in older adults with and without depression could inform the development of interventions that treat and prevent mood and cognitive disorders of aging. Furthermore, stress reduction, decreased inflammation, and improved emotional regulation may have direct neuroplastic effects on the brain, leading to greater resilience. Complementary use of MBTs combined with standard antidepressant treatment may allow for additional improvement in clinical outcomes of LLD, including resilience, quality of life, general health, and cognitive function. Additional research testing the efficacy of those interventions designed to improve resilience in older adults with mood and mental disorders is needed.

Bottom Line

Identifying the clinical, neurocognitive, and neurobiological biomarkers of resilience in late-life depression could aid in the development of targeted interventions that treat and prevent mood and cognitive disorders of aging. Mind-body interventions can help boost resilience and improve outcomes in geriatric patients with mood and cognitive disorders.

Related Resources

• Lavretsky H. Resilience and Aging: Research and Practice. Johns Hopkins University Press; 2014.
• Lavretsky H, Sajatovic M, Reynolds CF, eds. Complementary and Integrative Therapies for Mental Health and Aging. Oxford University Press; 2016.
• Eyre HA, Berk M, Lavretsky H, et al, eds. Convergence Mental Health: A Transdisciplinary Approach to Innovation. Oxford University Press; 2021.
• UCLA Jane & Terry Semel Institute for Neuroscience & Human Behavior. Late-life Depression, Stress, and Wellness Research Program. https://www.semel.ucla.edu/latelife