Epilepsy & Seizures

Altered thalamo-hippocampal resting state functional brain connectivity may serve as a biomarker to signal treatment resistance in patients with temporal lobe epilepsy (TLE) suggests a recent study of 286 patients with epilepsy.

• Researchers from Rockefeller University reviewed data from a database that included resting state functional MRI readings.
• The analysis included seizure characterization, EEG indications of lateralization, and localization of seizure foci.
• The investigators compared records from patients with well-controlled TLE to those with treatment resistant disease and healthy controls.
• Treatment resistant patients had a significant bilateral decrease in thalamo-hippocampal functional connectivity.

Pressl C, Brandner P, Schaffelhofer S, et al. Resting state functional connectivity patterns associated with pharmacological treatment resistance in temporal lobe epilepsy. Epilepsy Res. 2019;149:37-43.

Altered thalamo-hippocampal resting state functional brain connectivity may serve as a biomarker to signal treatment resistance in patients with temporal lobe epilepsy (TLE) suggests a recent study of 286 patients with epilepsy.

• Researchers from Rockefeller University reviewed data from a database that included resting state functional MRI readings.
• The analysis included seizure characterization, EEG indications of lateralization, and localization of seizure foci.
• The investigators compared records from patients with well-controlled TLE to those with treatment resistant disease and healthy controls.
• Treatment resistant patients had a significant bilateral decrease in thalamo-hippocampal functional connectivity.

Pressl C, Brandner P, Schaffelhofer S, et al. Resting state functional connectivity patterns associated with pharmacological treatment resistance in temporal lobe epilepsy. Epilepsy Res. 2019;149:37-43.

Altered thalamo-hippocampal resting state functional brain connectivity may serve as a biomarker to signal treatment resistance in patients with temporal lobe epilepsy (TLE) suggests a recent study of 286 patients with epilepsy.

• Researchers from Rockefeller University reviewed data from a database that included resting state functional MRI readings.
• The analysis included seizure characterization, EEG indications of lateralization, and localization of seizure foci.
• The investigators compared records from patients with well-controlled TLE to those with treatment resistant disease and healthy controls.
• Treatment resistant patients had a significant bilateral decrease in thalamo-hippocampal functional connectivity.

Pressl C, Brandner P, Schaffelhofer S, et al. Resting state functional connectivity patterns associated with pharmacological treatment resistance in temporal lobe epilepsy. Epilepsy Res. 2019;149:37-43.

Delaying the first dose of antiseizure medication in children with status epilepticus will likely prolong the condition, according a report published in Epilepsy Research.

• Investigators from the Division of Child Neurology at Children’s National Health System in Washington, DC, evaluated the timing and selection of antiseizure medication in children presenting at a pediatric emergency department.
• Among 141 patients with status epilepticus (SE), median age 45 months, SE lasted 61.5 min (median).
• Median time to receipt of the first dose of antiseizure drug was 25 min.
• Ninety two percent of patients received a benzodiazepine as the first drug.
• A benzodiazepine was the second dose antiseizure medication in 95% of patients.
• Among patients who received the first dose of medication in less than 5 minutes, seizures lasted 59.5 min (median) while children who did not receive their first dose for an hour or more after seizure experienced a duration of 151.5 min.

Cohen NT, Chamberlain JM, Gaillard WD. Timing and selection of first antiseizure medication in patients with pediatric status epilepticus. Epilepsy Res. 2019;149:21-25.

Delaying the first dose of antiseizure medication in children with status epilepticus will likely prolong the condition, according a report published in Epilepsy Research.

• Investigators from the Division of Child Neurology at Children’s National Health System in Washington, DC, evaluated the timing and selection of antiseizure medication in children presenting at a pediatric emergency department.
• Among 141 patients with status epilepticus (SE), median age 45 months, SE lasted 61.5 min (median).
• Median time to receipt of the first dose of antiseizure drug was 25 min.
• Ninety two percent of patients received a benzodiazepine as the first drug.
• A benzodiazepine was the second dose antiseizure medication in 95% of patients.
• Among patients who received the first dose of medication in less than 5 minutes, seizures lasted 59.5 min (median) while children who did not receive their first dose for an hour or more after seizure experienced a duration of 151.5 min.

Cohen NT, Chamberlain JM, Gaillard WD. Timing and selection of first antiseizure medication in patients with pediatric status epilepticus. Epilepsy Res. 2019;149:21-25.

Delaying the first dose of antiseizure medication in children with status epilepticus will likely prolong the condition, according a report published in Epilepsy Research.

• Investigators from the Division of Child Neurology at Children’s National Health System in Washington, DC, evaluated the timing and selection of antiseizure medication in children presenting at a pediatric emergency department.
• Among 141 patients with status epilepticus (SE), median age 45 months, SE lasted 61.5 min (median).
• Median time to receipt of the first dose of antiseizure drug was 25 min.
• Ninety two percent of patients received a benzodiazepine as the first drug.
• A benzodiazepine was the second dose antiseizure medication in 95% of patients.
• Among patients who received the first dose of medication in less than 5 minutes, seizures lasted 59.5 min (median) while children who did not receive their first dose for an hour or more after seizure experienced a duration of 151.5 min.

Cohen NT, Chamberlain JM, Gaillard WD. Timing and selection of first antiseizure medication in patients with pediatric status epilepticus. Epilepsy Res. 2019;149:21-25.

Children exposed to valproate in utero were 48% more likely to be diagnosed with ADHD when compared with unexposed children in a population-based cohort study of more than 900,000 children in Denmark.

Antiepileptic drug exposure is associated with an increased risk of various congenital malformations, but its role in the development of ADHD in children has not been well documented, first author Jakob Christensen, MD, PhD, DrMedSci, of Aarhus (Denmark) University Hospital, and his colleagues wrote in their paper, published online Jan. 4 in JAMA Network Open.

The researchers identified 913,302 singleton births in Denmark from 1997 through 2011, with children followed through 2015.

Overall, children who were prenatally exposed to valproate had a 48% increased risk of ADHD. Antiepileptic drug exposure was defined as 30 days before the estimated day of conception to the day of birth, and included valproate, clobazam, and other antiepileptic drugs. The average age of the children at the study’s end was 10 years, and approximately half were male.

A total of 580 children were exposed to valproate in utero; of these, 8.4% were later diagnosed with ADHD, compared with 3.2% of 912,722 children who were not exposed to valproate. In addition, the absolute 15-year risk of ADHD was 11% in valproate-exposed children vs. 4.6% in unexposed children. No significant associations appeared between ADHD and other antiepileptic drugs.

The study findings were limited by several factors, including the contraindication of valproate for use in pregnancy, which may mean that the women taking valproate had more severe disease, the researchers noted.

“Due to the observational nature of this study, we cannot rule out that the observed risk increase for ADHD is at least in part explained by the mother’s health condition that triggered the prescription of valproate during pregnancy,” they said. Other limitations included a lack of data on the exact amounts of valproate taken during pregnancy and the potential impact of nonepilepsy medications, they noted.

However, the results were strengthened by the large size and population-based cohort, and support warnings by professional medical organizations against valproate use in pregnancy, the researchers said. “As randomized clinical trials of valproate use during pregnancy are neither feasible nor ethical, our study provides clinical information on the risk of ADHD associated with valproate use during pregnancy,” they concluded.

The study was supported by grants to various authors from the Danish Epilepsy Association Central Denmark Region, the Aarhus University Research Foundation, the Lundbeck Foundation, the National Institutes of Health, the Novo Nordisk Foundation, and the European Commission.

SOURCE: Christensen J et al. JAMA Network Open. 2019;2(1):e186606. doi: 10.1001/jamanetworkopen.2018.6606.

Children exposed to valproate in utero were 48% more likely to be diagnosed with ADHD when compared with unexposed children in a population-based cohort study of more than 900,000 children in Denmark.

Antiepileptic drug exposure is associated with an increased risk of various congenital malformations, but its role in the development of ADHD in children has not been well documented, first author Jakob Christensen, MD, PhD, DrMedSci, of Aarhus (Denmark) University Hospital, and his colleagues wrote in their paper, published online Jan. 4 in JAMA Network Open.

The researchers identified 913,302 singleton births in Denmark from 1997 through 2011, with children followed through 2015.

Overall, children who were prenatally exposed to valproate had a 48% increased risk of ADHD. Antiepileptic drug exposure was defined as 30 days before the estimated day of conception to the day of birth, and included valproate, clobazam, and other antiepileptic drugs. The average age of the children at the study’s end was 10 years, and approximately half were male.

A total of 580 children were exposed to valproate in utero; of these, 8.4% were later diagnosed with ADHD, compared with 3.2% of 912,722 children who were not exposed to valproate. In addition, the absolute 15-year risk of ADHD was 11% in valproate-exposed children vs. 4.6% in unexposed children. No significant associations appeared between ADHD and other antiepileptic drugs.

The study findings were limited by several factors, including the contraindication of valproate for use in pregnancy, which may mean that the women taking valproate had more severe disease, the researchers noted.

“Due to the observational nature of this study, we cannot rule out that the observed risk increase for ADHD is at least in part explained by the mother’s health condition that triggered the prescription of valproate during pregnancy,” they said. Other limitations included a lack of data on the exact amounts of valproate taken during pregnancy and the potential impact of nonepilepsy medications, they noted.

However, the results were strengthened by the large size and population-based cohort, and support warnings by professional medical organizations against valproate use in pregnancy, the researchers said. “As randomized clinical trials of valproate use during pregnancy are neither feasible nor ethical, our study provides clinical information on the risk of ADHD associated with valproate use during pregnancy,” they concluded.

The study was supported by grants to various authors from the Danish Epilepsy Association Central Denmark Region, the Aarhus University Research Foundation, the Lundbeck Foundation, the National Institutes of Health, the Novo Nordisk Foundation, and the European Commission.

SOURCE: Christensen J et al. JAMA Network Open. 2019;2(1):e186606. doi: 10.1001/jamanetworkopen.2018.6606.

Children exposed to valproate in utero were 48% more likely to be diagnosed with ADHD when compared with unexposed children in a population-based cohort study of more than 900,000 children in Denmark.

Antiepileptic drug exposure is associated with an increased risk of various congenital malformations, but its role in the development of ADHD in children has not been well documented, first author Jakob Christensen, MD, PhD, DrMedSci, of Aarhus (Denmark) University Hospital, and his colleagues wrote in their paper, published online Jan. 4 in JAMA Network Open.

The researchers identified 913,302 singleton births in Denmark from 1997 through 2011, with children followed through 2015.

Overall, children who were prenatally exposed to valproate had a 48% increased risk of ADHD. Antiepileptic drug exposure was defined as 30 days before the estimated day of conception to the day of birth, and included valproate, clobazam, and other antiepileptic drugs. The average age of the children at the study’s end was 10 years, and approximately half were male.

A total of 580 children were exposed to valproate in utero; of these, 8.4% were later diagnosed with ADHD, compared with 3.2% of 912,722 children who were not exposed to valproate. In addition, the absolute 15-year risk of ADHD was 11% in valproate-exposed children vs. 4.6% in unexposed children. No significant associations appeared between ADHD and other antiepileptic drugs.

The study findings were limited by several factors, including the contraindication of valproate for use in pregnancy, which may mean that the women taking valproate had more severe disease, the researchers noted.

“Due to the observational nature of this study, we cannot rule out that the observed risk increase for ADHD is at least in part explained by the mother’s health condition that triggered the prescription of valproate during pregnancy,” they said. Other limitations included a lack of data on the exact amounts of valproate taken during pregnancy and the potential impact of nonepilepsy medications, they noted.

However, the results were strengthened by the large size and population-based cohort, and support warnings by professional medical organizations against valproate use in pregnancy, the researchers said. “As randomized clinical trials of valproate use during pregnancy are neither feasible nor ethical, our study provides clinical information on the risk of ADHD associated with valproate use during pregnancy,” they concluded.

The study was supported by grants to various authors from the Danish Epilepsy Association Central Denmark Region, the Aarhus University Research Foundation, the Lundbeck Foundation, the National Institutes of Health, the Novo Nordisk Foundation, and the European Commission.

SOURCE: Christensen J et al. JAMA Network Open. 2019;2(1):e186606. doi: 10.1001/jamanetworkopen.2018.6606.

CHICAGO—About half of staring spells referred to a new-onset seizure (NOS) clinic turn out to be epileptic seizures, according to a retrospective chart review presented at the 47th Annual Meeting of the Child Neurology Society.

Children with nonepileptic staring were younger and more likely to have developmental delay, compared with children with epileptic staring, said Seunghyo Kim, MD, Visiting Associate Professor of Pediatrics at Emory University School of Medicine in Atlanta, and his colleagues. In addition, children with nonepileptic staring were more likely to have been referred by a primary care physician than by an emergency department.

A Common Reason for Referral

Staring spells are common in children and a frequent reason for referral to NOS clinics, the investigators said. Staring spells may be generalized absence seizures, focal seizures, or nonepileptic events. Few studies, however, have examined patients who newly present to a neurology clinic with the chief complaint of staring spells.

To evaluate the clinical and demographic features of children who present with staring spells to a regional NOS clinic, the researchers reviewed charts from 2,818 patients who visited a children’s hospital between September 22, 2015, and March 19, 2018. The investigators identified 189 patients with staring spells.

They excluded 48 cases where staring was accompanied by or followed by generalized tonic-clonic seizures or other motor seizures. In addition, they excluded 16 cases of established epilepsy and four cases of provoked seizures, including febrile seizures.

The final study population included 121 cases. About 48% of these patients with staring spells were African American, and 38% were white. Patients’ mean age at first visit to the NOS clinic was 6, and mean age at staring spell onset was 5.2.

Fifty-nine patients (49%) had epileptic staring episodes, and 62 patients (51%) had nonepileptic events.

Continue to: Approximately 50% were referred by an emergency department...

MRI Findings in Patients With Focal Seizures

On average, patients with nonepileptic staring were younger at the initial clinic presentation and at staring spell onset. Patients with nonepileptic staring had an average age of 4.8 at their initial visit, whereas patients with focal seizures had an average age of 6.3. Patients with absence seizures had an average age of 8.3.

Patients with nonepileptic events were more likely to have developmental delay (approximately 35%) versus patients with focal seizures (23%) or absence seizures (8%).

Absence epilepsy was diagnosed in 24 patients (20%), and focal epilepsy in 35 patients (29%).

Of the 59 cases of epileptic staring, 46% (n = 27) were classified as syndromic; 36% (n = 21) had childhood absence epilepsy, and 5% (n = 3) had juvenile absence epilepsy. In addition, there was one case each of mesial temporal lobe epilepsy with hippocampal sclerosis, Panayiotopoulos syndrome, and generalized epilepsy with febrile seizures.

About one-third of patients received MRI, and seven patients had etiologically relevant findings (eg, brain tumor, malformation of cortical development, and periventricular leukomalacia). All of the patients with abnormal MRIs had focal seizures.

“An NOS clinic ... can provide rapid, accurate diagnoses for staring spells,” said Dr. Kim. “This is important, as children with nonepileptic events should not be given the diagnosis of epilepsy, and their events should not be treated with seizure medications. Similarly, children who have epileptic seizures require accurate diagnosis, as the treatment depends on the seizure type.”

CHICAGO—About half of staring spells referred to a new-onset seizure (NOS) clinic turn out to be epileptic seizures, according to a retrospective chart review presented at the 47th Annual Meeting of the Child Neurology Society.

Children with nonepileptic staring were younger and more likely to have developmental delay, compared with children with epileptic staring, said Seunghyo Kim, MD, Visiting Associate Professor of Pediatrics at Emory University School of Medicine in Atlanta, and his colleagues. In addition, children with nonepileptic staring were more likely to have been referred by a primary care physician than by an emergency department.

A Common Reason for Referral

Staring spells are common in children and a frequent reason for referral to NOS clinics, the investigators said. Staring spells may be generalized absence seizures, focal seizures, or nonepileptic events. Few studies, however, have examined patients who newly present to a neurology clinic with the chief complaint of staring spells.

To evaluate the clinical and demographic features of children who present with staring spells to a regional NOS clinic, the researchers reviewed charts from 2,818 patients who visited a children’s hospital between September 22, 2015, and March 19, 2018. The investigators identified 189 patients with staring spells.

They excluded 48 cases where staring was accompanied by or followed by generalized tonic-clonic seizures or other motor seizures. In addition, they excluded 16 cases of established epilepsy and four cases of provoked seizures, including febrile seizures.

The final study population included 121 cases. About 48% of these patients with staring spells were African American, and 38% were white. Patients’ mean age at first visit to the NOS clinic was 6, and mean age at staring spell onset was 5.2.

Fifty-nine patients (49%) had epileptic staring episodes, and 62 patients (51%) had nonepileptic events.

Continue to: Approximately 50% were referred by an emergency department...

MRI Findings in Patients With Focal Seizures

On average, patients with nonepileptic staring were younger at the initial clinic presentation and at staring spell onset. Patients with nonepileptic staring had an average age of 4.8 at their initial visit, whereas patients with focal seizures had an average age of 6.3. Patients with absence seizures had an average age of 8.3.

Patients with nonepileptic events were more likely to have developmental delay (approximately 35%) versus patients with focal seizures (23%) or absence seizures (8%).

Absence epilepsy was diagnosed in 24 patients (20%), and focal epilepsy in 35 patients (29%).

Of the 59 cases of epileptic staring, 46% (n = 27) were classified as syndromic; 36% (n = 21) had childhood absence epilepsy, and 5% (n = 3) had juvenile absence epilepsy. In addition, there was one case each of mesial temporal lobe epilepsy with hippocampal sclerosis, Panayiotopoulos syndrome, and generalized epilepsy with febrile seizures.

About one-third of patients received MRI, and seven patients had etiologically relevant findings (eg, brain tumor, malformation of cortical development, and periventricular leukomalacia). All of the patients with abnormal MRIs had focal seizures.

“An NOS clinic ... can provide rapid, accurate diagnoses for staring spells,” said Dr. Kim. “This is important, as children with nonepileptic events should not be given the diagnosis of epilepsy, and their events should not be treated with seizure medications. Similarly, children who have epileptic seizures require accurate diagnosis, as the treatment depends on the seizure type.”

CHICAGO—About half of staring spells referred to a new-onset seizure (NOS) clinic turn out to be epileptic seizures, according to a retrospective chart review presented at the 47th Annual Meeting of the Child Neurology Society.

Children with nonepileptic staring were younger and more likely to have developmental delay, compared with children with epileptic staring, said Seunghyo Kim, MD, Visiting Associate Professor of Pediatrics at Emory University School of Medicine in Atlanta, and his colleagues. In addition, children with nonepileptic staring were more likely to have been referred by a primary care physician than by an emergency department.

A Common Reason for Referral

Staring spells are common in children and a frequent reason for referral to NOS clinics, the investigators said. Staring spells may be generalized absence seizures, focal seizures, or nonepileptic events. Few studies, however, have examined patients who newly present to a neurology clinic with the chief complaint of staring spells.

To evaluate the clinical and demographic features of children who present with staring spells to a regional NOS clinic, the researchers reviewed charts from 2,818 patients who visited a children’s hospital between September 22, 2015, and March 19, 2018. The investigators identified 189 patients with staring spells.

They excluded 48 cases where staring was accompanied by or followed by generalized tonic-clonic seizures or other motor seizures. In addition, they excluded 16 cases of established epilepsy and four cases of provoked seizures, including febrile seizures.

The final study population included 121 cases. About 48% of these patients with staring spells were African American, and 38% were white. Patients’ mean age at first visit to the NOS clinic was 6, and mean age at staring spell onset was 5.2.

Fifty-nine patients (49%) had epileptic staring episodes, and 62 patients (51%) had nonepileptic events.

Continue to: Approximately 50% were referred by an emergency department...

MRI Findings in Patients With Focal Seizures

On average, patients with nonepileptic staring were younger at the initial clinic presentation and at staring spell onset. Patients with nonepileptic staring had an average age of 4.8 at their initial visit, whereas patients with focal seizures had an average age of 6.3. Patients with absence seizures had an average age of 8.3.

Patients with nonepileptic events were more likely to have developmental delay (approximately 35%) versus patients with focal seizures (23%) or absence seizures (8%).

Absence epilepsy was diagnosed in 24 patients (20%), and focal epilepsy in 35 patients (29%).

Of the 59 cases of epileptic staring, 46% (n = 27) were classified as syndromic; 36% (n = 21) had childhood absence epilepsy, and 5% (n = 3) had juvenile absence epilepsy. In addition, there was one case each of mesial temporal lobe epilepsy with hippocampal sclerosis, Panayiotopoulos syndrome, and generalized epilepsy with febrile seizures.

About one-third of patients received MRI, and seven patients had etiologically relevant findings (eg, brain tumor, malformation of cortical development, and periventricular leukomalacia). All of the patients with abnormal MRIs had focal seizures.

“An NOS clinic ... can provide rapid, accurate diagnoses for staring spells,” said Dr. Kim. “This is important, as children with nonepileptic events should not be given the diagnosis of epilepsy, and their events should not be treated with seizure medications. Similarly, children who have epileptic seizures require accurate diagnosis, as the treatment depends on the seizure type.”

NEW ORLEANS – Abnormalities of hippocampal volume and morphology in children with temporal lobe or juvenile myoclonic epilepsy (JME) are also present in the brains of their unaffected siblings, although to a lesser extent, based on findings from two studies presented at the annual meeting of the American Epilepsy Society.

While the studies suggest an imaging endophenotype associated with these disorders, it’s unclear if a larger degree of abnormality causes disease manifestation, or whether there are other predisposing actors at work.

“What our study tells us is that hippocampal abnormalities can occur in the absence of seizure,” Marian Galovic, MD, said in an interview. “It may be that, in some cases, hippocampal abnormalities could be the cause, rather than the consequence, of seizures.”

Dr. Galovic of University College London was on hand to discuss the work of his colleague, Lili Long, MD, PhD, of the Xiangya Hospital of Central South University, Changsha, China. Visa issues prevented her from attending the meeting.

The study included 18 sibling pairs in which the affected siblings had sporadic, nonlesional temporal lobe epilepsy (TLE), involving the right lobe in 12 and the left in 6. The patients, siblings, and 18 healthy, age-matched controls underwent clinical, electrophysiologic, and high-resolution structural neuroimaging.

The researchers compared overall hippocampal volumes between groups and determined the subregional extent of hippocampal abnormalities using shape analysis. They also looked at whole-brain differences in cortical thickness and folding complexity.

As expected, median hippocampal volumes were largest in the healthy controls (left = 2.82 mL, right = 2.94 mL), and smallest in patients. Patients with left TLE had a median left hippocampal volume of 2.23 mL, while those with right TLE had a median right hippocampal volume of 1.92 mL.

However, volume in the unaffected siblings was a surprise. Like the patients, these subjects also had significant reductions in hippocampal volume when compared with controls (left = 2.47 mL, right = 2.65 mL). “The atrophy was relatively similar in siblings and patients, although not as pronounced in siblings,” Dr. Galovic said. “It was mostly unilateral in the siblings and bilateral in the patients, but it was still more pronounced on the side where the epilepsy of the affected sibling was coming from.”

Dr. Marian Galovic

Dr. Marian Galovic

[email protected]

SOURCES: Long L et al. AES 2018, Abstract 2.183; Caciagli L et al. AES 2018, Abstract 2.166.

NEW ORLEANS – Abnormalities of hippocampal volume and morphology in children with temporal lobe or juvenile myoclonic epilepsy (JME) are also present in the brains of their unaffected siblings, although to a lesser extent, based on findings from two studies presented at the annual meeting of the American Epilepsy Society.

While the studies suggest an imaging endophenotype associated with these disorders, it’s unclear if a larger degree of abnormality causes disease manifestation, or whether there are other predisposing actors at work.

“What our study tells us is that hippocampal abnormalities can occur in the absence of seizure,” Marian Galovic, MD, said in an interview. “It may be that, in some cases, hippocampal abnormalities could be the cause, rather than the consequence, of seizures.”

Dr. Galovic of University College London was on hand to discuss the work of his colleague, Lili Long, MD, PhD, of the Xiangya Hospital of Central South University, Changsha, China. Visa issues prevented her from attending the meeting.

The study included 18 sibling pairs in which the affected siblings had sporadic, nonlesional temporal lobe epilepsy (TLE), involving the right lobe in 12 and the left in 6. The patients, siblings, and 18 healthy, age-matched controls underwent clinical, electrophysiologic, and high-resolution structural neuroimaging.

The researchers compared overall hippocampal volumes between groups and determined the subregional extent of hippocampal abnormalities using shape analysis. They also looked at whole-brain differences in cortical thickness and folding complexity.

As expected, median hippocampal volumes were largest in the healthy controls (left = 2.82 mL, right = 2.94 mL), and smallest in patients. Patients with left TLE had a median left hippocampal volume of 2.23 mL, while those with right TLE had a median right hippocampal volume of 1.92 mL.

However, volume in the unaffected siblings was a surprise. Like the patients, these subjects also had significant reductions in hippocampal volume when compared with controls (left = 2.47 mL, right = 2.65 mL). “The atrophy was relatively similar in siblings and patients, although not as pronounced in siblings,” Dr. Galovic said. “It was mostly unilateral in the siblings and bilateral in the patients, but it was still more pronounced on the side where the epilepsy of the affected sibling was coming from.”

Dr. Marian Galovic

Dr. Marian Galovic

[email protected]

SOURCES: Long L et al. AES 2018, Abstract 2.183; Caciagli L et al. AES 2018, Abstract 2.166.

NEW ORLEANS – Abnormalities of hippocampal volume and morphology in children with temporal lobe or juvenile myoclonic epilepsy (JME) are also present in the brains of their unaffected siblings, although to a lesser extent, based on findings from two studies presented at the annual meeting of the American Epilepsy Society.

While the studies suggest an imaging endophenotype associated with these disorders, it’s unclear if a larger degree of abnormality causes disease manifestation, or whether there are other predisposing actors at work.

“What our study tells us is that hippocampal abnormalities can occur in the absence of seizure,” Marian Galovic, MD, said in an interview. “It may be that, in some cases, hippocampal abnormalities could be the cause, rather than the consequence, of seizures.”

Dr. Galovic of University College London was on hand to discuss the work of his colleague, Lili Long, MD, PhD, of the Xiangya Hospital of Central South University, Changsha, China. Visa issues prevented her from attending the meeting.

The study included 18 sibling pairs in which the affected siblings had sporadic, nonlesional temporal lobe epilepsy (TLE), involving the right lobe in 12 and the left in 6. The patients, siblings, and 18 healthy, age-matched controls underwent clinical, electrophysiologic, and high-resolution structural neuroimaging.

The researchers compared overall hippocampal volumes between groups and determined the subregional extent of hippocampal abnormalities using shape analysis. They also looked at whole-brain differences in cortical thickness and folding complexity.

As expected, median hippocampal volumes were largest in the healthy controls (left = 2.82 mL, right = 2.94 mL), and smallest in patients. Patients with left TLE had a median left hippocampal volume of 2.23 mL, while those with right TLE had a median right hippocampal volume of 1.92 mL.

However, volume in the unaffected siblings was a surprise. Like the patients, these subjects also had significant reductions in hippocampal volume when compared with controls (left = 2.47 mL, right = 2.65 mL). “The atrophy was relatively similar in siblings and patients, although not as pronounced in siblings,” Dr. Galovic said. “It was mostly unilateral in the siblings and bilateral in the patients, but it was still more pronounced on the side where the epilepsy of the affected sibling was coming from.”

Dr. Marian Galovic

Dr. Marian Galovic

[email protected]

SOURCES: Long L et al. AES 2018, Abstract 2.183; Caciagli L et al. AES 2018, Abstract 2.166.

Developmental encephalopathic epilepsies (DEEs) are responsible for a disproportionate number of cases of drug resistance, early deaths, and disability, according to researchers from Northwestern-Feinberg School of Medicine and Yale School of Medicine.

• An analysis of 613 pediatric patients from the Connecticut Study of Epilepsy allowed researchers to classify patients into specific epilepsy syndromes and to reclassify them over a period of 9 years.
• Among these children, 58 were found to have DEEs (9.4%).
• DEEs were more resistant to drug therapy than other epilepsies (71% vs 18%), more likely to cause intellectual disability (84% vs 11%), and more likely to cause death (21% vs <1%).
• The analysis also revealed changes from the initial epilepsy diagnosis over time, eg, Lennox-Gastaut syndrome was initially diagnosed in only 4 children but by the end of 9 years, 22 had received the diagnosis.

Berg AT, Levy SR, Testa FM. Evolution and course of early life developmental encephalopathic epilepsies: Focus on Lennox‐Gastaut syndrome. Epilepsia. 2018;59:2096-2105.

Developmental encephalopathic epilepsies (DEEs) are responsible for a disproportionate number of cases of drug resistance, early deaths, and disability, according to researchers from Northwestern-Feinberg School of Medicine and Yale School of Medicine.

• An analysis of 613 pediatric patients from the Connecticut Study of Epilepsy allowed researchers to classify patients into specific epilepsy syndromes and to reclassify them over a period of 9 years.
• Among these children, 58 were found to have DEEs (9.4%).
• DEEs were more resistant to drug therapy than other epilepsies (71% vs 18%), more likely to cause intellectual disability (84% vs 11%), and more likely to cause death (21% vs <1%).
• The analysis also revealed changes from the initial epilepsy diagnosis over time, eg, Lennox-Gastaut syndrome was initially diagnosed in only 4 children but by the end of 9 years, 22 had received the diagnosis.

Berg AT, Levy SR, Testa FM. Evolution and course of early life developmental encephalopathic epilepsies: Focus on Lennox‐Gastaut syndrome. Epilepsia. 2018;59:2096-2105.

Developmental encephalopathic epilepsies (DEEs) are responsible for a disproportionate number of cases of drug resistance, early deaths, and disability, according to researchers from Northwestern-Feinberg School of Medicine and Yale School of Medicine.

• An analysis of 613 pediatric patients from the Connecticut Study of Epilepsy allowed researchers to classify patients into specific epilepsy syndromes and to reclassify them over a period of 9 years.
• Among these children, 58 were found to have DEEs (9.4%).
• DEEs were more resistant to drug therapy than other epilepsies (71% vs 18%), more likely to cause intellectual disability (84% vs 11%), and more likely to cause death (21% vs <1%).
• The analysis also revealed changes from the initial epilepsy diagnosis over time, eg, Lennox-Gastaut syndrome was initially diagnosed in only 4 children but by the end of 9 years, 22 had received the diagnosis.

Berg AT, Levy SR, Testa FM. Evolution and course of early life developmental encephalopathic epilepsies: Focus on Lennox‐Gastaut syndrome. Epilepsia. 2018;59:2096-2105.

Analyzing infraslow amplitude modulations may help clinicians better understand changes in intracranial EEG readings over the long-term and help researchers develop better algorithms to forecast the onset of seizures, according to a report published in Epilepsia.

• Investigators from Yale-New Haven Hospital collected intracranial EEG readings from 13 adult patients with medically refractory epilepsy.
• To derive infraslow envelope correlations, they estimated magnitude-squared coherence at <0.15 Hz of EEG frequency band power time series for all electrode contact pairs.
• Infraslow envelope magnitude-squared coherence increased significantly after patients had their antiepileptic drugs tapered; it also increased at night and decreased during the day.

Joshi RB, Duckrow RB, Goncharova II, et al. Seizure susceptibility and infraslow modulatory activity in the intracranial electroencephalogram. Epilepsia. 2018;59:2075-2085.

Analyzing infraslow amplitude modulations may help clinicians better understand changes in intracranial EEG readings over the long-term and help researchers develop better algorithms to forecast the onset of seizures, according to a report published in Epilepsia.

• Investigators from Yale-New Haven Hospital collected intracranial EEG readings from 13 adult patients with medically refractory epilepsy.
• To derive infraslow envelope correlations, they estimated magnitude-squared coherence at <0.15 Hz of EEG frequency band power time series for all electrode contact pairs.
• Infraslow envelope magnitude-squared coherence increased significantly after patients had their antiepileptic drugs tapered; it also increased at night and decreased during the day.

Joshi RB, Duckrow RB, Goncharova II, et al. Seizure susceptibility and infraslow modulatory activity in the intracranial electroencephalogram. Epilepsia. 2018;59:2075-2085.

Analyzing infraslow amplitude modulations may help clinicians better understand changes in intracranial EEG readings over the long-term and help researchers develop better algorithms to forecast the onset of seizures, according to a report published in Epilepsia.

• Investigators from Yale-New Haven Hospital collected intracranial EEG readings from 13 adult patients with medically refractory epilepsy.
• To derive infraslow envelope correlations, they estimated magnitude-squared coherence at <0.15 Hz of EEG frequency band power time series for all electrode contact pairs.
• Infraslow envelope magnitude-squared coherence increased significantly after patients had their antiepileptic drugs tapered; it also increased at night and decreased during the day.

Joshi RB, Duckrow RB, Goncharova II, et al. Seizure susceptibility and infraslow modulatory activity in the intracranial electroencephalogram. Epilepsia. 2018;59:2075-2085.

Diagnosing psychogenic nonepileptic seizures (PNES) can prove challenging; using provocative induction is one way to detect the disorder. A recent experiment suggests that inducing seizures without the use of a placebo is just as effective as inducing them with one.

• Researchers compared 170 patients suspected of having PNES who underwent provocative induction plus placebo to 170 patients who underwent the same induction procedure without a saline solution placebo.
• Induction triggered a seizure in 79.4% of patients without the help of the placebo, compared to 73.5% with placebo, a non-significant difference.
• Investigators postulated that the greater success rate in the non-placebo group may have resulted from the greater cumulative induction experience of clinicians, which may have influenced the manner and presentation of how the induction was presented.
• The study concluded that experienced clinicians should opt for non-placebo based provocative induction.

Chen DK, Dave H, Gadelmola, K et al. Provocative induction of psychogenic nonepileptic seizures: Noninferiority of an induction technique without versus with placebo.  Epilepsia. 2018; 59:e161-e165.

Diagnosing psychogenic nonepileptic seizures (PNES) can prove challenging; using provocative induction is one way to detect the disorder. A recent experiment suggests that inducing seizures without the use of a placebo is just as effective as inducing them with one.

• Researchers compared 170 patients suspected of having PNES who underwent provocative induction plus placebo to 170 patients who underwent the same induction procedure without a saline solution placebo.
• Induction triggered a seizure in 79.4% of patients without the help of the placebo, compared to 73.5% with placebo, a non-significant difference.
• Investigators postulated that the greater success rate in the non-placebo group may have resulted from the greater cumulative induction experience of clinicians, which may have influenced the manner and presentation of how the induction was presented.
• The study concluded that experienced clinicians should opt for non-placebo based provocative induction.

Chen DK, Dave H, Gadelmola, K et al. Provocative induction of psychogenic nonepileptic seizures: Noninferiority of an induction technique without versus with placebo.  Epilepsia. 2018; 59:e161-e165.

Diagnosing psychogenic nonepileptic seizures (PNES) can prove challenging; using provocative induction is one way to detect the disorder. A recent experiment suggests that inducing seizures without the use of a placebo is just as effective as inducing them with one.

• Researchers compared 170 patients suspected of having PNES who underwent provocative induction plus placebo to 170 patients who underwent the same induction procedure without a saline solution placebo.
• Induction triggered a seizure in 79.4% of patients without the help of the placebo, compared to 73.5% with placebo, a non-significant difference.
• Investigators postulated that the greater success rate in the non-placebo group may have resulted from the greater cumulative induction experience of clinicians, which may have influenced the manner and presentation of how the induction was presented.
• The study concluded that experienced clinicians should opt for non-placebo based provocative induction.

Chen DK, Dave H, Gadelmola, K et al. Provocative induction of psychogenic nonepileptic seizures: Noninferiority of an induction technique without versus with placebo.  Epilepsia. 2018; 59:e161-e165.