Video-electroencephalogram Monitoring Research Articles

Deep Brain Stimulation Inhibits Epileptic Seizures via Increase of Adenosine Release and Inhibition of ENT1, CD39, and CD73 Expression.

Deep brain stimulation (DBS) of the anterior nucleus of the thalamus is an efficacious treatment option for patients with refractory epilepsy. Our previous study demonstrates that adenosine is a potential target of DBS for the treatment of epilepsy. Equilibrative nucleoside transporters-1 (ENT1) and ectonucleotidases (CD39, CD73) function as regulators of extracellular adenosine in the brain. It is unclear whether ENT1, CD39, and CD73 are involved in the mechanism of DBS for epilepsy. A total of 48 SD male rats were divided into four groups: control (naïve rats), Pilo (pilocarpine induced rats with epilepsy), DBS (rats with epilepsy treated with DBS for 8weeks), and sham. In the present study, video electroencephalogram monitoring, Morris water maze assays, in vivo measurements of adenosine using fiber photometry, histochemistry, and western blot were performed on the hippocampus. DBS markedly attenuated spontaneous recurrent seizures (SRSs) and enhanced spatial learning in rats with epilepsy, assessed through video-EEG and water maze assays. Fibred photometry measurements of an adenosine sensor revealed dynamic increase in extracellular adenosine during DBS. The expressions of ENT1, CD39, and CD73 in Pilo group and sham group increased compared with the control group, while the expressions of ENT1, CD39, and CD73 in DBS group decreased compared to that of Pilo group and sham group. The findings indicate that DBS reduces the number of SRSs and improves spatial memory in rats with epilepsy with concomitant decrease of ENT1, CD39, and CD73 expressions. Adenosine-modulating enzymes might be the potential targets of DBS for the treatment of epilepsy.

Mice harboring the T316N variant in the GABAAR γ2 subunit exhibit sleep-related hypermotor epilepsy phenotypes and hypersynchronization in the thalamocortical pathway

ObjectiveSleep-related hypermotor epilepsy (SHE) is a focal epilepsy syndrome characterized by seizures that predominantly occur during sleep. The pathogenesis of these seizures remains unclear. We previously detected rare variants in GABRG2, which encodes the γ2 subunit of γ-aminobutyric acid type A receptor (GABAAR), in patients with SHE and demonstrated that these variants impaired GABAAR function in vitro. However, the mechanisms by which GABRG2 variants contribute to seizure attacks during sleep remain unclear. MethodsIn this study, we designed a knock-in (KI) mouse expressing the mouse Gabrg2 T316N variant, corresponding to human GABRG2 T317N variant, using CRISPR/Cas9. Continuous video-electroencephalogram monitoring and in vivo multichannel electrophysiological recordings were performed to explore seizure susceptibility to pentylenetetrazol (PTZ), alterations in the sleep-wake cycle, spontaneous seizure patterns, and synchronized activity in the motor thalamic nuclei (MoTN) and secondary motor cortex (M2). Circadian variations in the expression of total, membrane-bound, and synaptic GABAAR subunits were also investigated. ResultsNo obvious changes in gross morphology were detected in Gabrg2T316N/+ mice compared to their wild-type (Gabrg2+/+) littermates. Gabrg2T316N/+ mice share key phenotypes with patients, including sleep fragmentation and spontaneous seizures during sleep. Gabrg2T316N/+ mice showed increased susceptibility to PTZ-induced seizures and higher mortality after seizures. Synchronization of the local field potentials between the MoTN and M2 was abnormally enhanced in Gabrg2T316N/+ mice during light phase, when sleep dominates, accompanied by increased local activities in the MoTN and M2. Interestingly, in Gabrg2+/+ mice, GABAAR γ2 subunits showed a circadian increase on the neuronal membrane and synaptosomes in the transition from dark phase to light phase, which was absent in Gabrg2T316N/+ mice. ConclusionWe generated a new SHE mouse model and provided in vivo evidence that rare variants of GABRG2 contribute to seizure attacks during sleep in SHE.

Which psychogenic nonepileptic seizure (PNES) patients are more likely to be treated with anti-seizure medications?

BackgroundThe average time for psychogenic nonepileptic seizures (PNES) diagnosis is about 7.5 years. Many patients receive inadequate treatment and sometimes even life-threatening treatments such as tracheal intubation during this time. PurposeTo determine the risk factors for misdiagnosis of PNES as Epilepsy. MethodsThe medical records of patients who underwent video-electroencephalogram (EEG) monitoring were reviewed retrospectively. Patients who had PNES without epileptic seizures (ES) were included in this study. Baseline personal and monitoring characteristics were collected. The patients were then divided into two groups based on their therapeutic status. Patients in the treatment group were again divided into two groups based on the number of anti-seizure medications (ASM) they were treated with. ResultsFifty-seven patients diagnosed with PNES were included in this study. Thirty-seven patients were under treatment, and 20 patients were not under treatment at the time of monitoring. Motor seizures, abnormal interictal EEG patterns, and pathological brain imaging findings were more frequent among patients in the treatment group (p<0.05). Patients with motor seizures were more likely to be treated with multiple ASM than patients with only dialeptic nonmotor seizures (p<0.05). Lastly, patients in the treatment group were monitored longer and had fewer seizures during monitoring (p<0.05). ConclusionPNES patients with abnormal EEG patterns and pathological brain imaging findings are more likely to be treated with ASM. The pure dialeptic nature of seizures is less likely to be misdiagnosed as ES. In addition, patients with such seizures are less likely to be treated with multiple treatment lines.

Invoking Uncertainty: Parents' Accounts for Intrusions on Medical Authority in Pediatric Neurology.

In pediatric medical visits, parents may assume the role of co-caregiver with clinicians. At times, parents challenge physicians' authority to determine diagnoses and treatments for their children. The present study uses conversation analysis to examine parents' accounts for their intrusions on medical authority in a corpus of 35 video-recorded pediatric neurology visits for overnight video-electroencephalogram monitoring. I show how parents can exploit their legitimate role as carers to challenge medical authority. Through invoking uncertainty in contexts where they have somehow challenged medical authority, parents can account for their conduct in ways that elide direct conflict with physicians and thereby minimize damage to the physician-family partnership.

Content or context? A study protocol for a three-arm parallel randomised controlled trial of Re-PROGRAM, a brief internet-based intervention for patients with functional seizures

IntroductionFunctional seizures (FS) mimic epilepsy but are not caused by epileptic electrical activity in the brain and are believed to have a psychological origin. There is a well-documented gap between...

Conduction treatment of temporal lobe epilepsy in rats: the dose-effect relationship between current resistance and therapeutic effect.

To investigate the effect of current resistance on therapeutic outcomes, and the mechanism of current conduction treatment in a rat model of temporal lobe epilepsy (TLE). Rats were randomly divided into four groups: normal control, epileptic group, low-resistance conduction (LRC) and high-resistance conduction (HRC) group. The content of glutamate (Glu) and gamma-amino butyric acid (GABA) in the hippocampus was determined using a neurotransmitter analyzer. mRNA and protein expression of interleukin 1β (IL-1β) /IL-1 receptor 1(IL-1R1) and high mobility group protein B1 (HMGB-1)/toll-like receptor-4 (TLR-4) in hippocampal neurons were tested. Video electroencephalogram monitoring was used to record seizures and EEG discharges. Cognitive function in the rats was tested using the Morris water maze. Glu/GABA ratio in the epileptic control and HRC groups was significant differences from LRC group. The levels of HMGB1/TLR4 and IL-1β/IL-1R1 in the LRC group and normal control group were significantly lower than those in epileptic control group (p < 0.01) and the HRC group. The mRNA levels of HMGB1/TLR4 and IL-1β/IL-1R1 in the LRC group and normal control group were significantly lower than those in epileptic control group. The frequency of total and propagated seizures was lower in the LRC group than in the epileptic control and HRC groups (p < 0.01). The numbers of platform crossings in the LRC group and normal control group were significantly higher than those in the epileptic control and HRC groups in the space exploration experiment. Current resistance affected seizure control and cognitive protection in rats with TLE treated by current conduction. The lower current resistance, the better seizure control and cognitive protection in rats with TLE treated by current conduction. Glu/GABA, IL-1β/IL-1R1, and HMGB1/TLR-4 may participate in the anti-seizure mechanism of current conduction treatment.

Ocular emotion discrimination disorders in self-limited epilepsy patients with centrotemporal spikes complicated with electrical status epilepticus during sleep: A pediatric neuropsychological study.

We investigated the characteristics and factors influencing eye emotion recognition in self-limited epilepsy patients with centrotemporal spikes (SeLECTS) complicated with electrical status epilepticus during sleep (ESES). We selected SeLECTS (n=160) patients treated in the outpatient and inpatient departments of Anhui Children's Hospital from September 2020 to January 2022. According to the video electroencephalogram monitoring slow-wave index (SWI), SeLECTS patients with SWI<50% were assigned into the typical SeLECTS group (n=79), and patients with SWI ≥ 50% were assigned into the ESES group (n=81). Patients in the two groups were assessed by The Eye Basic Emotion Discrimination Task (EBEDT) and The Eye Complex Emotion Discrimination Task (ECEDT), respectively. Comparisons were made with age-, sex- and education level-matched healthy control participants. The correlation between the characteristics of emotional discrimination disorder in the eye area and the clinical influencing factors was analyzed in ESES group, and p ≤ .050 was the threshold for significance. Relative to the healthy control group, scores of sadness and fear in the typical SeLECTS group were markedly lower (p=.018, p=.023), while differences in scores of disgust, happiness, surprise, and anger were not significantly different between the groups (p=.072, p=.162, p=.395, p=.380, respectively). Compared with the healthy control group, the ESES group had significantly low scores in recognition of sadness, fear, disgust, and surprise (p=.006, p=.016, p=.043 and p=.038, respectively). However, differences in recognition of happiness and anger between the groups were not significant (p=.665 and p=.272). Univariate logistic analysis showed that the score of eye recognition for sadness in the ESES group was affected by age of onset, SWI, ESES duration and number of seizures. The score of eye recognition for fear was mainly affected by SWI, while the score of eye recognition for disgust was affected by SWI and number of seizures. The surprised eye emotion recognition score was mainly affected by the number of seizures. Variables with p<.1 were considered to be independent variables of multivariable ordered logistic regression. Multivariate logistic analysis showed that sadness emotion recognition was mainly affected by SWI and ESES duration, while disgust was mainly affected by SWI. The typical SeLECTS group showed impaired emotion (sadness and fear) recognition function in the eye area. The ESES group was associated with more intense emotional (sadness, fear, disgust, and surprise) recognition impairment in the eye region. The higher the SWI, the younger the onset age and the longer the duration of ESES, while the more the number of seizures, the more serious the impairment of emotional recognition function in the affected eye area.

The P2X7 Receptor as a Mechanistic Biomarker for Epilepsy

Epilepsy, characterized by recurrent spontaneous seizures, is a heterogeneous group of brain diseases affecting over 70 million people worldwide. Major challenges in the management of epilepsy include its diagnosis and treatment. To date, video electroencephalogram (EEG) monitoring is the gold-standard diagnostic method, with no molecular biomarker in routine clinical use. Moreover, treatment based on anti-seizure medications (ASMs) remains ineffective in 30% of patients, and, even if seizure-suppressive, lacks disease-modifying potential. Current epilepsy research is, therefore, mainly focussed on the identification of new drugs with a different mechanism of action effective in patients not responding to current ASMs. The vast heterogeneity of epilepsy syndromes, including differences in underlying pathology, comorbidities and disease progression, represents, however, a particular challenge in drug discovery. Optimal treatment most likely requires the identification of new drug targets combined with diagnostic methods to identify patients in need of a specific treatment. Purinergic signalling via extracellularly released ATP is increasingly recognized to contribute to brain hyperexcitability and, consequently, drugs targeting this signalling system have been proposed as a new therapeutic strategy for epilepsy. Among the purinergic ATP receptors, the P2X7 receptor (P2X7R) has attracted particular attention as a novel target for epilepsy treatment, with P2X7Rs contributing to unresponsiveness to ASMs and drugs targeting the P2X7R modulating acute seizure severity and suppressing seizures during epilepsy. In addition, P2X7R expression has been reported to be altered in the brain and circulation in experimental models of epilepsy and patients, making it both a potential therapeutic and diagnostic target. The present review provides an update on the newest findings regarding P2X7R-based treatments for epilepsy and discusses the potential of P2X7R as a mechanistic biomarker.

Electroclinical characteristics of photosensitive epilepsy: A retrospective study of 31 Chinese children and literature review.

The objective of this study was to better understand the clinical features of photosensitive epilepsy (PSE) in Chinese children. Thirty-one children with PSE were screened out of 398 children with epilepsy who were consecutively diagnosed by the video-electroencephalogram (VEEG) monitoring method and by using an intermittent photic stimulation (IPS) test. Their EEGs and clinical features were retrospectively analyzed, and their treatment outcomes were followed up. PSE accounted for 7.79% (31/398) of children with epilepsy during the observation period in our single epilepsy center. The male to female ratio of PSE was 1:3.43, and the average seizure onset age was 7.8 ± 3.28 years. The highest range of frequency sensitivity of the IPS test for the induction of EEG epileptic discharge or electroclinical seizures was within 10-20 Hz. Electroclinical seizures were induced in 41.94% (13/31) of PSE patients by using the IPS test, while EEG discharge without clinical seizures was induced in 58.06% (18/31) of PSE patients. Among all PSE patients, an IPS-positive reaction in the eye-closure state was induced in 83.87% of patients, and this rate was significantly higher than that in the eye-opened state (41.94%) or eye-closed state (35.48%). (Eye-closure IPS stimulation means: make the subjects close their eyes at the beginning of each stimulation, open their eyes at the end of the stimulation, and close their eyes again at the beginning of the next stimulation, and so on. While Eye-closed IPS stimulation means the stimulation is started after 5 s of eye closure, and the subjects are kept closed throughout the whole process.) The common and effective drugs used for single or combined therapy in PSE children were valproic acid and levetiracetam. This study provides some useful information about electroclinical characteristics in a cohort of 31 PSE children. It may be beneficial for pediatric neurologists in terms of paying more attention to PSE and correctly dealing with it.

Safety and efficacy of rapid withdrawal of antiseizure medications during long-term video-electroencephalogram monitoring in children with drug-resistant epilepsy: Aretrospective study.

Performing long-term video-electroencephalographic monitoring (LTVEM) to obtain the ictal electroencephalogram (EEG) is important for presurgical evaluation. This study aimed at investigating the safety and efficacy of our protocol developed at Peking University First Hospital (PUFH) for rapid withdrawal of antiseizure medications (ASMs) during LTVEM to induce seizures in children with drug-resistant epilepsy (DRE) exhibiting nondaily seizures. Children with DRE who followed the PUFH protocol for rapid withdrawal of ASMs during LTVEM between 2018 and 2021 were enrolled. The occurrence of seizures, number of ASMs withdrawn, seizure onset time after ASM tapering initiation, changes in interictal epileptiform discharge (IED), and adverse events were evaluated during LTVEM. Among 80 children evaluated in this study, seizures were induced successfully in 72 (90%) children. Furthermore, no change in IED sites was observed in these 72 children following the initiation of ASM tapering while 2 children exhibited secondary bilateral tonic-clonic seizures. The median time from ASM tapering initiation to the onset of the first seizure was found to be 3 days (2-4), while the median number of ASMs withdrawn was 2 (1-2). Finally, 66 children (91.7%) had habitual seizures while 6 children had nonhabitual seizure semiology. The PUFH protocol can be used for the rapid withdrawal of ASMs during LTVEM in children with DRE. Using this protocol, ictal EEG patterns can be obtained in a relatively short time for most patients with fewer adverse effects during LTVEM, which may provide meaningful electro-clinical information for presurgical evaluation.

Variable Association of Physiologic Changes With Electrographic Seizure-Like Events in Infants Born Preterm

To determine the incidence of seizure-like events in a cohort of infants born preterm as well as the prevalence of associated vital sign changes (heart rate [HR], respiratory rate, and pulse oximetry [SpO2]). We performed prospective conventional video electroencephalogram monitoring on infants born at 23-30weeks of gestational age during the first 4 postnatal days. For detected seizure-like events, simultaneously captured vital sign data were analyzed during the pre-event baseline and during the event. Significant vital sign changes were defined as HR or respiratory rate >±2 SD from the infant's own baseline physiologic mean, derived from a 10-minute interval before the seizure-like event. Significant change in SpO2 was defined as oxygen desaturation during the event with a mean SpO2 <88%. Our sample included 48 infants with median gestational age of 28weeks (IQR 26-29) and birth weight of 1125g (IQR 963-1265). Twelve (25%) infants had seizure-like discharges with a total of 201 events; 83% (10/12) of infants had vital sign changes during these events, and 50% (6/12) had significant vital sign changes during the majority of the seizure-like events. Concurrent HR changes occurred the most frequently. Individual infant variability was observed in the prevalence of concurrent vital sign changes with electroencephalographic seizure-like events. Physiologic changes associated with preterm electrographic seizure-like events should be investigated further as a potential biomarker to assess the clinical significance of such events in the preterm population.

Anti-Apoptotic Effects of AMPA Receptor Antagonist Perampanel in Early Brain Injury After Subarachnoid Hemorrhage in Mice.

This study was aimed to investigate if acute neuronal apoptosis is induced by activation of AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazole propionate) receptors (AMPARs) and inhibited by a clinically available selective AMPAR antagonist and antiepileptic drug perampanel (PER) in subarachnoid hemorrhage (SAH), and if the mechanisms include upregulation of an inflammation-related matricellular protein periostin. Sham-operated and endovascular perforation SAH mice randomly received an administration of 3mg/kg PER or the vehicle intraperitoneally. Post-SAH neurological impairments and increased caspase-dependent neuronal apoptosis were associated with activation of AMPAR subunits GluA1 and GluA2, and upregulation of periostin and proinflammatory cytokines interleukins-1β and -6, all of which were suppressed by PER. PER also inhibited post-SAH convulsion-unrelated increases in the total spectral power on video electroencephalogram (EEG) monitoring. Intracerebroventricularly injected recombinant periostin blocked PER's anti-apoptotic effects on neurons. An intracerebroventricular injection of a selective agonist for GluA1 and GluA2 aggravated neurological impairment, neuronal apoptosis as well as periostin upregulation, but did not increase the EEG total spectral power after SAH. A higher dosage (10mg/kg) of PER had even more anti-apoptotic effects compared with 3mg/kg PER. Thus, this study first showed that AMPAR activation causes post-SAH neuronal apoptosis at least partly via periostin upregulation. A clinically available AMPAR antagonist PER appears to be neuroprotective against post-SAH early brain injury through the anti-inflammatory and anti-apoptotic effects, independent of the antiepileptic action, and deserves further study.

Periictal water drinking revisited: Occurrence and lateralizing value in surgically confirmed patients with focal epilepsy.

Periictal water drinking (PIWD), which is a rare seizure-related autonomic behavior, has been reported in temporal lobe epilepsy (TLE) but only rarely in extra-TLE. Additionally, the lateralizing value of PIWD is controversial. We aimed to clarify the occurrence and lateralizing value of PIWD in patients with focal epilepsy. This retrospective study included 240 focal epilepsy patients aged >10 years with a favorable postoperative seizure outcome (Engel class I). PIWD was defined as water drinking behavior during a seizure or within 2 min in the postictal phase. The occurrence of PIWD documented on video-electroencephalogram monitoring was assessed. The lateralizing value of PIWD was analyzed among patients whose language dominant hemisphere was identified. Twenty-three (9.5%) patients exhibited PIWD. PIWD occurred more frequently in frontal lobe epilepsy (FLE; eight of 41 patients, 19.5%) than in TLE (15 of 188 patients, 8%). The occurrence of PIWD was significantly different between FLE and extra-FLE (P=0.035), with a low positive predictive value (34.8%). In FLE with PIWD, all but one patient underwent resective surgery involving the medial frontal lobe. In 194 patients whose language dominant hemisphere was determined, the lateralizing value of PIWD in FLE and TLE showed no statistical significance (P=0.69 and P=0.27, respectively). Periictal water drinking occurred more often in FLE than TLE. Thus, PIWD might not be a specific periictal symptom in TLE. There was no evidence for the lateralizing value of PIWD in FLE and TLE. These findings can provide useful clinical clues for preoperative evaluations to estimate the epileptogenic zone based on seizure semiology and allow for a better understanding of pathophysiological insights into PIWD.

Pediatric Cardiology Consultation at Long-Term Video EEG Monitoring

Objective: In children, a broad range of paroxysmal events, including syncope and arrhythmias, may mimic true epileptic seizures. When a definitive diagnosis could not be established, long-term video electroencephalogram monitoring (LTVEM) should be taken into consideration. Furthermore, epilepsy patients have a higher rate of cardiac comorbidities. The purpose of this study is to evaluate the rationale and results of the pediatric cardiology consultations in patients admitted to the LTVEM unit. Methods: We retrospectively analyzed the files of children who were admitted to LTVEM unit and consulted with the pediatric cardiology department between January 2006 and May 2014. The patients who had both echocardiography and 24-hour ambulatory electrocardiogram monitoring were included. Results: Among 70 children, 74.3% (n: 52) were classified as having epilepsy, 21.4%. (n: 15) with nonepileptic events, and 4.3% (n: 3) could not be classified. In epilepsy group, 21 children (40.4%) were consulted with pediatric cardiology due to rhythm disturbances detected during LTVEM, the remaining consultations (59.6%) were due to history of known cardiac diagnosis (arrythmias n: 2, structural/congenital heart disease: 5), tuberosclerosis (n: 6), drop attacks (n: 5), murmur (n: 5), and other reasons. The cardiac evaluation revealed previously undetected arrhythmia (n:3) and mitral valve prolapse (n:1) in four patients with epilepsy. In addition to the pre-existing long QT syndrome, one child experienced his typical attack, subsequently he was diagnosed as epilepsy. The remaining group consisted of 18 children, with syncope being the most common diagnosis for consultation (n: 10, 55.5%). Conclusion: Our study revealed that a subgroup of children with epilepsy had cardiovascular comorbidities. Additionally, epilepsy was confirmed in some patients who already had cardiac problems. Pediatricians should be aware of potential mimickers of epilepsy and note that epilepsy and cardiac problems may also co-exist. Correct diagnosis and appropriate treatment are crucial in this patient group.

The IN-MIDAZ study – Intranasal midazolam in aborting seizures – An epilepsy monitoring unit based randomized controlled trial for efficacy

ObjectiveTo compare efficacy and safety of Intranasal and Intramuscular routes of midazolam administration in terminating seizures. MethodThis was an open label Randomized controlled trial (RCT). People with drug resistant epilepsy (DRE) undergoing Video Electroencephalogram (VEEG) monitoring, were randomized in a 1:1 ratio to receive either Intranasal (IN) or Intramuscular (IM) midazolam, for prolonged seizures: longer than 5 min for focal, and longer than 2 min for focal to bilateral tonic-clonic. Outcome assessor was blinded to the allocation arm. Primary outcome was time to electrographic seizure termination after administration of midazolam. All adverse events in both the groups were noted. ResultA total of 1108 seizures were recorded in 130 subjects, of which 110 (65 seizures in 23 subjects in IN group; 45 seizures in 18 subjects in IM group) seizures required midazolam administration and were included in final analysis. Mean time to electrographic seizure termination after midazolam administration was 45.1 ± 23.8 s in the IM group and 90.4 ± 59.0 s in the IN group (p = 0.0014); mean time to clinical seizure termination was 53.9 ± 25.8 s in IM group and 104.3 ± 66.4 s in the IN group (p = 0.002). Local side effects were more in IN group; hypotension as serious adverse event was noted in the IM group. SignificanceThough mean time to electrographic and clinical seizure termination was significantly lesser in Intramuscular group for both adults and pediatric population, it was still under 2 min in the Intranasal midazolam group.IN midazolam is a useful option for terminating seizures.

The High-Dose of Exogenous Melatonin Did Not Alter the Sleep-Wake Cycle in Anoxic Brain Injury Patients

Disturbance in circadian rhythms and the sleep-wake cycle is typical for patients in the intensive care unit, which retards rehabilitation. To assess the effect of exogenous melatonin and simultaneous mitigation of intensive care unit environmental factors on sleep duration. We studied five patients with chronic disorder of consciousness caused by anoxic brain injury. In addition, we varied the level of melatonin secretion in blood plasma to assess melatonin’s bioavailability and elimination time. We evaluated the sleep-wake cycle using continuous videoelectroencephalogram monitoring with the addition of oculographic and myographic channels for 72 hours. All the patients received melatonin tablets on the second day, wore masks and ear plugs, and had no feeding and nursing manipulations at night on the second and third days. There was no significant difference in sleep time between the first, second, and third days. Future studies of the circadian rhythm should aim at gaining a deeper analysis of the characteristics of the sleep-wake cycle in patients with severe anoxic brain injury together with further research for possible ways to influence the circadian component of sleep.

Elderly-Onset Paroxysmal Kinesigenic Dyskinesia: A Case Report.

Paroxysmal kinesigenic dyskinesia (PKD) is characterized by transient and recurrent involuntary movements that are triggered by a sudden movement. Here, we report an elderly female patient with a 1-month history of paroxysmal rigidity of the right limb. As the symptoms were characterized as paroxysmal, transient, and repetitive, her condition was initially thought to be epilepsy. Subsequent examinations showed no abnormality in the continuous video-electroencephalogram (EEG) monitoring, magnetic resonance imaging (MRI), fluorodeoxyglucose (FDG)-positron emission tomography (PET)/computed tomography (CT), and genetic testing. The final diagnosis was identified as clinically diagnosed PKD, and the symptoms were well controlled after oxcarbazepine treatment. To our knowledge, this is the first report to show elderly-onset PKD. This case expands our understanding of the age of onset of PKD. However, it is necessary to differentiate PKD from reflex epilepsy and hysteria attacks. For patients with typical clinical manifestations, we should adhere to the standard diagnostic workflow for the efficient diagnosis of PKD, aiming at avoiding misdiagnosis and mistreatment.

Clinical Characteristics and Prognostic Significance of Subclinical Seizures in Focal Epilepsy: A Retrospective Study.

IntroductionThe aim was to evaluate the clinical characteristics and prognostic significance of subclinical seizures (SCSs) on scalp video-electroencephalogram (VEEG) monitoring with or without intracranial electroencephalogram (IEEG) monitoring in patients who had epilepsy surgery.MethodsWe reviewed 286 epileptic patients who underwent subsequent epilepsy surgery during scalp-VEEG evaluation with or without IEEG monitoring between 2013 and 2020, with a minimum follow-up of 1 year. The prevalence and clinical characteristics of SCSs, as well as their prognostic significance, were analyzed.ResultsA total of 286 patients were enrolled for analysis, and 80 patients had IEEG implanted. SCSs were recorded in 9.79% of the patients based on VEEG and 50% based on IEEG. In the VEEG group (n = 286), younger seizure onset (P = 0.004) was associated with the presence of s-SCSs (SCSs detected on scalp VEEG). In the IEEG group (n = 80), temporal lobe epilepsy (P = 0.015) was associated with the presence of i-SCSs (SCSs detected on IEEG). Of 286 patients, 208 (72.73%) were seizure-free in the VEEG group, and 56 0f 80 patients (70%) were seizure-free in the IEEG group through the last follow-up. In the VEEG group, the presence of s-SCSs did not affect seizure outcome; predictors of seizure recurrence were longer epilepsy duration (P = 0.003, OR 1.003, 95% CI 1.001–1.005), history of focal to bilateral tonic–clonic seizure (P = 0.027, OR 1.665, 95% CI 1.060–2.613), nonspecific pathology (P = 0.018, OR 2.184, 95% CI 1.145–4.163), and incomplete resection (P = 0.004, OR 2.705, 95% CI 1.372–5.332). In the IEEG group, i-SCSs were significantly associated with seizure outcome (P = 0.028, OR 0.371, 95% CI 0.153–0.898).ConclusionThe rate of SCSs captured on IEEG monitoring was higher than that on VEEG monitoring during presurgical evaluation. SCSs detected on VEEG monitoring were associated with younger seizure onset. SCSs detected on IEEG monitoring were associated with temporal lobe epilepsy and also predicted surgical outcomes in focal epilepsy.Supplementary InformationThe online version contains supplementary material available at 10.1007/s40120-022-00342-y.

Electroencephalography at the height of a pandemic: EEG findings in patients with COVID-19

ObjectiveTo characterize continuous video electroencephalogram (VEEG) findings of hospitalized COVID-19 patients. MethodsWe performed a retrospective chart review of patients admitted at three New York City hospitals who underwent VEEG at the peak of the COVID-19 pandemic. Demographics, comorbidities, neuroimaging, VEEG indications and findings, treatment, and outcomes were collected. ResultsOf 93 patients monitored, 77% had severe COVID-19 and 40% died. Acute ischemic or hemorrhagic stroke was present in 26% and 15%, respectively. Most common VEEG indications were encephalopathy/coma (60%) and seizure-like movements (38%). Most common VEEG findings were generalized slowing (97%), generalized attenuation (31%), generalized periodic discharges (17%) and generalized sharp waves (15%). Epileptiform abnormalities were present in 43% and seizures in 8% of patients, all of whom had seizure risk factors. Factors associated with an epileptiform VEEG included increasing age (OR 1.07, p = 0.001) and hepatic/renal failure (OR 2.99, p = 0.03). ConclusionsMost COVID-19 patients who underwent VEEG monitoring had severe COVID-19 and over one-third had acute cerebral injury (e.g., stroke, anoxia). Seizures were uncommon. VEEG findings were nonspecific. SignificanceVEEG findings in this cohort of hospitalized COVID-19 patients were those often seen in critical illness. Seizures were uncommon and occurred in the setting of common seizure risk factors.

Focal signs in infantile spasms

BackgroundInfantile spasms belong to the group of epileptic encephalopathies that typically occur in early infancy and are often associated with severe developmental delay. Little is known about whether focal features are part of the syndrome and thus occur independently of etiology, or whether focal features always indicate a cerebral lesion. MethodsIn our study we included all patients with infantile spasms documented by prolonged video-electroencephalogram (EEG) monitoring between 7/2003 and 11/2020 and analysed symptoms such as tonic posturing, clonic movements, deviation of the eyes and unilateral deviation of the mouth. These symptoms were classified as lateralizing or non-lateralizing and the correlation to the presence of a lesion was investigated. ResultsEighteen patients (9 w/9 m) were included in the study. Lateralizing tonic posturing was found in 66.6% of the patients. Deviation of the eyes to one side and unilateral deviation of the mouth were detected in 61.1% and 11.1% of patients, respectively. Taking into account all symptoms (tonic posturing, clonic movements, deviation of the eyes, unilateral deviation of the mouth), focal signs were observed in a total of 94.4%, with only half of the total patient population having a cerebral lesion. ConclusionIn our study, lateralizing symptoms in infantile spasms occurred independently of the presence of a lesion. In contrast, focal symptoms in older children or adults usually correlate with the presence and localization of a lesion. A possible hypothesis could be that the brain is still maturing in infancy.