The electroencephalogram (EEG) has an important role in the assessment of paroxysmal disorders. The routine EEG is the most frequently used type, however since the duration of the recording is short (typically around 20 minutes), and interictal EEG is often normal in patients with epilepsy, the usefulness of the technique has limitations. In a recent meta-analysis, the sensitivity of a routine EEG after a first unprovoked seizure was only 17.3 (7.9, 33.8) % in adults and 57.8 (49.7, 65.6) % in children.
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