Visual evoked potentials during long periods of pattern-reversal stimulation in migraine

Brain : a Journal of Neurology
J AfraJ Schoenen

Abstract

We have previously shown that during repetitive pattern-reversal stimulation, lasting 2 min, the amplitude of the visual evoked potential (PR-VEP) increases in migraineurs when tested interictally whereas it decreases in healthy control subjects. According to Sappey-Marinier et al. (J Cereb Blood Flow Metab 1992; 12: 584-92) habituation of the PR-VEP in normal subjects is maxima after 12 min, at a time when there is a decrease of stimulation-enhanced lactate levels in the occipital cortex. We have therefore compared PR-VEP during long periods of repetitive stimulation in healthy control subjects (n = 25) and in patients suffering from migraine without (n = 25) and with aura (n = 15) between attacks. During uninterrupted stimulation at 3.1 Hz VEPs were sequentially averaged in blocks of 100 responses for a total duration of 15 min and analysed in terms of latencies and peak-to-peak amplitudes of N1-P1 and P1-N2 peaks. Amplitude changes from the baseline were calculated for each block, by comparison with the first block, and analysed statistically using Zerbe's method. The N1-P1 and P1-N2 amplitudes in the first block tended to be lower in migraineurs than in healthy control subjects. During the 15 min of stimulation, amplitudes ...Continue Reading

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