Routine vs extended outpatient EEG for the detection of interictal epileptiform discharges.

ABSTRACT:

Objective

To compare the yield of epileptiform abnormalities on 30-minute recordings with those greater than 45 minutes.

Methods

We performed a prospective observational cross-sectional study of all outpatient routine EEGs comparing the rate of interictal epileptiform discharges (IEDs) and clinical events during the initial 30 minutes (routine) with those occurring in the remaining 30-60 minutes (extended). A relative increase of 10% was considered clinically significant.

Results

EEGs from 1,803 patients were included; overall EEG duration was 59.4 minutes (SD ±6.5). Of 426 patients with IEDs at any time during the EEG, 81 (19.1%, 95% confidence interval 15.6-23) occurred only after the initial 30 minutes. The rate of late IEDs was not associated with age, indication,

SUBMITTER: Burkholder DB 

PROVIDER: S-EPMC4836883 | biostudies-literature | 2016 Apr

REPOSITORIES: biostudies-literature