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Objective
To determine the structural networks that constrain propagation of ictal oscillations during epileptic spasm events, and compare the observed propagation patterns across patients with successful or unsuccessful surgical outcomes.
Methods
Subdural electrode recordings of 18 young patients (age 1–11 years) were analyzed during epileptic spasm events to determine ictal networks and quantify...
ObjectiveCortical resections in epilepsy surgery tend to be larger in children, compared to adults, partly due to underlying pathology. Some children show unilateral multifocal seizure onsets involving much of the hemisphere. If there were a significant hemiparesis present, hemispherectomy would be the procedure of choice. Otherwise, it is preferable to spare the primary sensorimotor cortex. We report...
Focality in electro-clinical or neuroimaging data often motivates epileptologists to consider epilepsy surgery in patients with medically-uncontrolled seizures, while not all focal findings are causally associated with the generation of epileptic seizures. With the help of Hill’s criteria, we have discussed how to establish causality in the context of the presurgical evaluation of epilepsy. The strengths...
Previous studies of epileptic spasms reported that ictal events were associated with high‐frequency oscillations (HFOs) or delta waves involving widespread regions. We determined whether ictal HFOs at 80–200 Hz were coupled with a phase of slow‐wave, whether ictal slow‐waves were diffusely or locally synchronous signals, and whether the mode of coupling between HFOs and slow‐wave phases differed between...
Purpose: We assessed 636 epileptic spasms seen in 11 children (median 44 spasms per child) and determined the spatial and temporal characteristics of ictal high‐frequency oscillations (HFOs) in relation to the onset of spasms.
Methods: Electrocorticography (ECoG) signals were sampled from 104–148 cortical sites per child, and the dynamic changes of ictal HFOs were animated on each individual’s three‐dimensional...
We retrospectively reviewed the clinical utility of initial video-EEG monitoring in a series of 1000 children suspected of epileptic disorders.The ages of patients (523 boys and 477 girls) ranged from 1 month to 17 years (median age: 7 years). The mean length of stay was 1.5 days (range: 1–10 days). Outcomes were classified as: ‘useful-epileptic’ (successful classification of epilepsy), ‘useful-nonepileptic’...
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