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The duration of an ambulatory electroencephalogram(aEEG)necessary to record epileptic seizures was studied in neurological patients.A total of 2221 aEEG recordings were made for 2035 inpatients.Ambulatory EEG lasting 1 to 8 days(mean,1.6 days)included seizures or typical undiagnosed symptomatic attacks in 750 recordings(34%)and 266 of them were epileptic in origin.Symptomatic attacks without simultaneous EEG discharger were exhibited in 27%of the epileptic patients.Of the total number of epileptic seizures,81%were encountered during the first 24 hours,an additional 10% during the next 24 hours,and 7%during the third 24-hour period.Our conclusion was that,in patients exhibiting epileptic seizures during the aEEG recording,the diagnosis will be confirmed by a 2-day recording in the vast majority of the cases. |
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