Admission to an Epilepsy monitoring unit (EMU) is considered the gold standard for characterization of seizures or spells and can help neurologists distinguish between seizures and non-epileptic events. About 15%-27% of all long-term video monitoring studies are non-diagnostic. Non-diagnostic studies after admission to EMU lead to a significant strain on the healthcare system due to added costs and financial and emotional stress to patients due to the uncertainty of diagnosis.

Preliminary analysis of 137 patient charts revealed 39 admissions (28.4%) were non-diagnostic. Of these, 67% were female and 71% were Caucasian. Mean age of presentation was 41.9 (13.46) years and median age of onset was 32 (17.25-43) years. The average length of stay was 3.64 (1.27) days and average event frequency prior to admission was 10.1(19) events/month. Median anti-seizure trials prior to EMU evaluation was 1 (0-2). 62% of patients had a normal preadmission routine EEG.  

Approximately 30% of admissions to the EMU are non-diagnostic.  Nearly two-thirds of these patients were women, had a normal preadmission routine EEG and majority were of Caucasian descent.