McMaster University, Department of Medicine, Division of Neurology, McMaster University Faculty of Health Sciences,
McMaster University, Department of Health Research Methods, Evidence, and Impact, Hamilton, Ontario, Canada
Correspondence: Michelle Shapiro
Hamilton General Hospital
237 Barton Street East, M-Wing Rm. 711
L8L 2X2, Canada
Definitions of epilepsy have changed to include a first unprovoked seizure with a high (>60%) risk of recurrence in the next 10 years. A single seizure and an epileptiform discharge on an EEG would suffice for this diagnosis. We hypothesized that an extended six-hour EEG in adult patients presenting with a first unprovoked seizure would demonstrate an increased yield of epileptiform discharges in comparison to a standard 30-minute EEG, and therefore higher rates of epilepsy diagnosis.