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Abstract Details

Events Recording in Patients who Underwent Ambulatory EEG and Inpatient EEG Monitoring
Epilepsy/Clinical Neurophysiology (EEG)
Epilepsy/Clinical Neurophysiology (EEG) Posters (7:00 AM-5:00 PM)
029
To directly compare the yield of capturing habitual events during ambulatory EEG (AEEG) and inpatient EEG monitoring (EMU) in a cohort of patients who underwent both evaluations and to determine the yield of an EMU admission after a non-diagnostic AEEG evaluation.

AEEG has emerged as an alternative to EMU evaluation in the diagnosis of epilepsy, but data about their respective yields are lacking.

This is a single center retrospective chart review study of patients who had both AEEG and EMU admission between 2013 and 2020.

A total of 343 patients had both studies. The average length of AEEG was 1.8±0.8 days and 4.4±1.0 days for EMU, 86% with antiseizure drugs held or reduced in EMU.

Of the 162 epileptic events recorded, 128 (79%; p<0.001) occurred in EMU, 7 (4.3%) during AEEG and 27 (16.7%) had events in both settings. Of the 49 non-epileptic events (PE), 30 (61.2%) occurred in the EMU, 8 (16.3%) during AEEG and 11 (22.4%) in both settings. Of the 23 patients who had both event types, 8 (34.8%) occurred in the EMU, 1 (4.3%) during AEEG and 14 (60.9%) in both settings.

Of the 195 patients who had an AEEG prior to EMU, 59 had interictal epileptiform discharges (IEDs), 15 seizures and 14 habitual PEs. Of the 107 patients who had non-diagnostic AEEG (normal AEEG and no habitual events), 65 (60.7%) had a diagnostic EMU study. 29 (27.1%) had epileptic seizures, 23 (21.5%) habitual PEs and 11 (10.3%) IEDs only. One patient (0.9%) had IED and habitual PE and one (0.9%) had epileptic seizure and habitual PE. 42 (39.3%) were non-diagnostic.

EMU has a higher diagnostic yield than AEEG to record events. A small percentage has events only on AEEG. Patients with a normal prior AEEG, have a 60% chance of having a diagnostic EMU admission.

Authors/Disclosures
Yara Mikhaeil-Demo, MD (Northwestern University, Feinberg School of Medicine)
PRESENTER 		Dr. Mikhaeil-Demo has nothing to disclose.
Elizabeth Cunningham Elizabeth Cunningham has nothing to disclose.
Karina A. Gonzalez Otarula, MD (University of South Dakota - Sanford Health) Dr. Gonzalez Otarula has nothing to disclose.
Stephan Schuele, MD, FÂ鶹´«Ã½Ó³»­ (Northwestern Memorial Hospital) Dr. Schuele has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Monteris. Dr. Schuele has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Neurelis. Dr. Schuele has received personal compensation in the range of $10,000-$49,999 for serving on a Speakers Bureau for SK Life Science. Dr. Schuele has received personal compensation in the range of $500-$4,999 for serving on a Speakers Bureau for Jazz. Dr. Schuele has received personal compensation in the range of $50,000-$99,999 for serving as an Editor, Associate Editor, or Editorial Advisory Board Member for Journal of Clinical Neurophysiology. Dr. Schuele has received personal compensation in the range of $500-$4,999 for serving as an Expert Witness for Thomas Needham. Dr. Schuele has received research support from National Institute of Health.