Rates of Event Capture of Ambulatory Video EEG

ObjectivesRecording electrographic and behavioral information during epileptic and other paroxysmal events is important during video EEG monitoring. This study was undertaken to measure the event capture rate of an ambulatory service operating across Australia using a shoulder-worn EEG device and telescopic pole-mounted camera.MethodsNeurologist reports were accessed retrospectively. Studies with confirmed events were identified and assessed for event capture by recording modality, whether events were reported or discovered, and wakefulness.Results6,265 studies were identified, of which 2,788 (44.50%) had events. A total of 15,691 events were captured, of which 77.89% were reported. The EEG-ECG amplifier was active for 99.83% of events. The patient was in view of the camera for 94.90% of events. 84.89% of studies had all events on camera, and 2.65% had zero events on camera (mean=93.66%, median=100.00%). 84.42% of events from wakefulness were reported, compared to 54.27% from sleep.ConclusionEvent capture was similar to previously reported rates from ambulatory studies, with higher capture rates on video. Most patients have all events captured on camera.SignificanceAmbulatory monitoring is capable of high rates of event capture, and the use of wide-angle cameras allows for all events to be captured in the majority of studies.HighlightsA review was undertaken of an Australia-wide ambulatory video-EEG monitoring servicePatients were in view of camera for 94.90% of events, and 84.89% of studies had all events on camera84.42% of events from wakefulness were reported, compared to 54.27% from sleep