Redefined giant somatosensory evoked potentials: Evoked epileptic complexes of excitatory and inhibitory components.

OBJECTIVE: Giant somatosensory evoked potentials (SEPs) are observed in patients with cortical myoclonus. Short-latency components (SLC), are regarded as evoked epileptic activities or paroxysmal depolarization shifts (PDSs). This study aimed to reveal the electrophysiological significance of the middle-latency component (MLC) P50 of the SEPs. METHODS: Twenty-two patients with cortical myoclonus having giant SEPs (patient group) and 15 healthy controls were included in this study. Waveform changes in SEPs before and after perampanel (PER) treatment were evaluated in the patient group. The wide range, time-frequency properties underlying the waveforms were compared between the groups. RESULTS: After PER treatment, SLC was prolonged and positively correlated with PER concentration, whereas MLC showed no correlation with PER concentration. Time-frequency analysis showed a power increase (156 Hz in all patients, 624 Hz in benign adult familial myoclonus epilepsy patients) underlying SLC and a power decrease (156 Hz, 624 Hz) underlying MLC in the patient group. CONCLUSIONS: The high-frequency power increase in SLCs and decrease in MLCs clearly reflected PDS and subsequent hyperpolarization, respectively. This relationship was similar to that of interictal epileptiform discharges, suggesting that giant SEPs evoke epileptic complexes of excitatory and inhibitory components. SIGNIFICANCE: MLCs of giant SEPs reflected inhibitory components.

On-scene time delays for epileptic seizures in developed community-based integrated care system regions.

BACKGROUND: Delayed on-scene time by emergency medical services (EMS) can have detrimental effects on critical cases for people with epilepsy (PWE). In preparation for a super-aged society, a Community-based Integrated Care System is crucial to manage healthcare costs. However, sufficient coordination irrespective of sociomedical changes among medical providers is challenging. AIM: This study aimed to evaluate on-scene time delays in the treatment of PWE, identify factors associated with such delays, and clarify regional differences. The focus was on the volume of acute care beds in regions with a developed Community-based Integrated Care System. METHODS: This population-based observational study evaluated on-scene time delays in the treatment of PWE across six major cities in western Japan between 2017 and 2021. In addition, we also evaluated the association between regional differences focusing on volume of acute care beds ("Reduced region" and "Preserved region", as cities with numbers of acute care beds per 1,000 people below and above the national average, respectively) along with sociomedical factors associated with on-scene time delays. RESULTS: This study included 8,737 PWE transported by EMS, with a mean on-scene time for EMS ranging from 12.9 ± 6.8 min to 21.7 ± 10.6 min. On-scene time delays were evident in Reduced regions, with an increase of 1.45 min (95 % confidence interval 0.86-2.03 min, p < 0.001). A high total EMS call volume independently influenced on-scene time delays during the middle period of the pandemic in Reduced regions. CONCLUSION: Optimal coordination must be facilitated to ensure the effective functioning of the Community-based Integrated Care System, particularly during unusual circumstances.

Exacerbation of Repetitive Falls Due to Atonic Seizures Following Perampanel Administration.

A 47-year-old man presented with tonic-clonic seizures characterized by convulsions. He repeatedly exhibited seizures despite treatment with four anti-seizure medications. During the titration process of perampanel (PER), the seizures paradoxically increased in intensity and frequency, resulting in trauma. Video electroencephalogram monitoring revealed interictal rapid rhythms and generalized spikes and documented atonic seizures. Thus, the patient was diagnosed with Lennox-Gastaut syndrome. Upon discontinuation of PER, the patient's atonic seizures with falls improved, probably suggesting a paradoxical effect of PER. A non-competitive antagonist selective for AMPA (α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid) receptors may have caused the weakness and delayed recovery from prolonged atonia that caused injuries.

On-scene time delays for epileptic seizures in emergencies during a social pandemic: A population-based study.

OBJECTIVES: The on-scene time of Emergency Medical Services (EMS), including time for hospital selection, is critical for people in an emergency. However, the outbreak of the novel coronavirus disease 2019 (COVID-19) led to longer delays in providing immediate care for individuals with non-COVID-19-related emergencies, such as epileptic seizures. This study aimed to examine factors associated with on-scene time delays for people with epilepsy (PWE) with seizures needing immediate amelioration. MATERIALS & METHODS: We conducted a population-based retrospective cohort study for PWE transported by EMS between 2016 and 2021. We used data from the Hiroshima City Fire Service Bureau database, divided into three study periods: "Pre period", the period before the COVID pandemic (2016-2019); "Early period", the early period of the COVID pandemic (2020); and "Middle period", the middle period of the COVID pandemic (2021). We performed linear regression modeling to identify factors associated with changes in EMS on-scene time for PWE during each period. In addition, we estimated the rate of total EMS call volume required to maintain the same on-scene time for PWE transported by EMS during the pandemic expansion. RESULTS: Among 2,205 PWE transported by EMS, significant differences in mean age and prevalence of impaired consciousness were found between pandemic periods. Total EMS call volume per month for all causes during the same month <5,000 (-0.55 min, 95% confidence interval [CI] -1.02 - -0.08, p = 0.022) and transport during the Early period (-1.88 min, 95%CI -2.75 - -1.00, p < 0.001) decreased on-scene time, whereas transport during the Middle period (1.58 min, 95%CI 0.70 - 2.46, p < 0.001) increased on-scene time for PWE transported by EMS. The rate of total EMS call volume was estimated as 0.81 (95%CI -0.04 - 1.07) during the expansion phase of the pandemic to maintain the same degree of on-scene time for PWE transported by EMS before the pandemic. CONCLUSIONS: On-scene time delays on PWE in critical care settings were observed during the Middle period. When the pandemic expanded, the EMS system required resource allocation to maintain EMS for time-sensitive illnesses such as epileptic seizures. Timely system changes are critical to meet dramatic social changes.

Immediate and 6-month seizure outcomes following first and second SARS-CoV2 mRNA vaccinations: A multicenter study with a nationwide survey.

OBJECTIVE: This study aimed to identify seizure outcomes in people with epilepsy (PWE) following severe acute respiratory syndrome coronavirus 2 (SARS-CoV2) messenger RNA vaccination. METHODS: We examined PWE (n = 332, age ≥ 14 years) treated in four tertiary hospitals between 2021 and 2022 to assess the incidence of seizure worsening following vaccination using closed questions. We identified the clinical factors associated with worsening and 6-month vaccination outcomes. We also conducted a nationwide survey on self-reported seizure worsening using open questions, to which 261 general practitioners from 99 institutes contributed. RESULTS: Of the 282 PWE vaccinated in the four hospitals, 16 (5.7%) exhibited seizure worsening; most of them emerged within 48 h of vaccination and were not sustained. Thus, all PWE were at baseline condition 6 months after their vaccination. PWE with seizure worsening were more significantly associated with focal impaired awareness seizures (p < 0.001), high seizure frequency (p = 0.025), and drug-resistant epilepsy (p = 0.007) at baseline compared to PWE without worsening. Multivariate logistic regression analysis revealed that focal impaired awareness seizures were independently associated with worsening (odds ratio, 7.0; 95% confidence interval, 1.50-32.77). A nationwide survey of 5156 PWE data (real-world data) confirmed an extremely low incidence rate of self-reported seizure worsening (0.43%). SIGNIFICANCE: Some PWE, particularly refractory focal epilepsy, exhibit seizure worsening. However, the worsening events were infrequent, non-sustainable, and probably under-reported by PWE, suggesting that there is little evidence that worsening seizures discourage current and future vaccinations.

[Ictal electroencephalography (EEG) activity and cerebral blood flow dynamics as potential pathological indicators: a case of anti-leucine-rich glioma-inactivated 1 protein (LGI1) encephalitis].

A 29 year-old, right-handed woman was admitted to our hospital due to her headache with fever elevation lasting for two months followed by a prolonged loss of awareness with an involuntary movement in her left hand and mouth. This movement appeared very frequently, and the duration was very short, so called "faciobrachial dystonic seizures (FBDS)". Some of FBDS were followed by prolonged loss of awareness. Brain MRI fluid attenuated inversion recovery (FLAIR) image revealed high intensity lesion in the left mesial temporal lobe. Arterial spin labeling (ASL) image indicated hyper perfusion in this lesion and also the lateral temporal region. No ictal electroencephalography (EEG) change was observed before the onset of FBDS. FBDS was often followed by focal impaired awareness seizure (FIAS) in which ictal EEG showed rhythmic alpha activity arising from left mid-temporal region. This EEG seizure pattern was clearly visible in the time-frequency analysis. Given these clinical findings, along with an evidence of serum anti-leucine-rich glioma-inactivated 1 (LGI1) antibody positive, she was diagnosed with anti-LGI1 encephalitis. Immunotherapy (methylpredonisolone and intravenous immunoglobulin) with a multiple anti-epileptic drugs therapy (lacosamide, perampanel, and lamotrigine) was highly responsible to her symptoms. Although the high intensity lesion in FLAIR image still remained after the treatment, findings of ASL and EEG showed clear correlation to her cognitive function and seizures, respectively. Temporal change in ASL imaging suggested that the hyper perfusion in ASL during the acute stage could be provided by inflammation of the encephalitis its self and also the seizures activities (FBDS and FIAS). The pathophysiological indication of anti-LGI1 encephalitis was limited in terms of the therapeutic strategy, however, our findings collectively suggested that the combination analysis of EEG activity and cerebral blood flow dynamics (ASL) could be the potential candidate.

Pomalidomide-associated progressive multifocal leukoencephalopathy in multiple myeloma: cortical susceptibility-weighted imaging hypointense findings prior to clinical deterioration.

Although there are several case reports of progressive multifocal leukoencephalopathy (PML) in multiple myeloma (MM), there are few reports of cases associated with pomalidomide. Here, we report the case of a 69-year-old female who had received 41 cycles of pomalidomide and dexamethasone treatment for relapsed/refractory IgG-κ MM presented with right-hand weakness; she was diagnosed as pomalidomide-associated PML. Fluid-attenuated inversion recovery (FLAIR) on admission showed high signals in the bilateral front-parietal lobe white matter, with multiple punctate lesions in the vicinity of the main lesions. These punctate pattern findings on FLAIR were similar to that of natalizumab-associated PML. Susceptibility weighted imaging (SWI) showed hypointense rims within the cortex at unaffected sites, in the initial stages. Subsequently, the clinical manifestations deteriorated, and the FLAIR images showed new hyperintense white matter lesions at the sites where cortical SWI hypointense rims were detected on the initial MRI examination. Our patient's serial MRI findings suggest that cortical SWI hypointense rims appear prior to the visible demyelinating white matter lesions in patients with PML.

Novel Asp511Thr mutation in McArdle disease with acute kidney injury caused by rhabdomyolysis.

McArdle disease (glycogen storage disease type V) is a rare hereditary metabolic myopathy. It can be overlooked clinically because it often presents as chronic asymptomatic hypercreatine phosphokinasemia (hyperCKemia). However, vigorous exercise or infections can trigger severe rhabdomyolysis. We present the case of a patient with long-term idiopathic hyperCKemia who, after contracting an upper respiratory tract infection, developed severe rhabdomyolysis and acute kidney injury. Upon hemodialysis, his renal function recovered and CK levels fell to below baseline, and maintenance therapy with vitamin B6 was also started. A molecular diagnosis of McArdle disease was subsequently made. Whole-exome sequencing revealed homozygous c1538delG (p.Asp511Thr fs*28) mutations in the PYGM gene, which was a novel mutation. Therefore, when investigating idiopathic hyperCKemia, glycogen storage disorders should also be considered.

A case of anti-MOG antibody-positive unilaterally dominant meningoencephalitis followed by longitudinally extensive transverse myelitis.

BACKGROUND: There are few reports of anti-myelin oligodendrocyte glycoprotein (MOG) antibody-positive, unilaterally dominant cerebral cortical encephalitis onset with epilepsy. We present such a case in a young female patient with myelitis. CASE PRESENTATION: A 19-year-old female developed generalized tonic seizures lasting several minutes. She had a low-grade fever and headache without other clinical neurological abnormalities while at our hospital. Cerebrospinal fluid (CSF) showed mononuclear pleocytosis. Other laboratory tests indicated no apparent abnormalities. Unilateral meningeal hyperintensity was seen on T2 fluid-attenuated inversion recovery MRI with associated cortical swelling and gadolinium enhancement of the cortical layer. One thousand mg/day of levetiracetam and a 3-day course of intravenous methylprednisolone at 1000 mg/day were administered. Dysuria appeared on the twentieth day of illness, and spinal MRI revealed a longitudinally extensive cord lesion from C5 to L1 consistent with myelitis. Two cycles of a 3-day course of intravenous methylprednisolone at 1000 mg/day were administered, and all symptoms disappeared. We found the patient to be anti-MOG antibody-positive using serum and CSF (titer: serum 1:256; CSF 1:128). CONCLUSION: Our report illustrates a unique case of anti-MOG presenting as new onset epilepsy secondary to unilaterally dominant meningoencephalitis preceding the onset of longitudinally extensive transverse myelitis.