OBSERVATIONS ON “DYSRHYTHMIC” MIGRAINE

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Abstract
Of 236 migraine patients, 59 (25%) had dysrhythmic EEG records. The percentage is probably smaller for the typical migraine population. Two major types of dysrhythmic EEG patterns have been described, both showing resting and hyper-ventilation patterns during the "free interval" which are not observed in ordinary migraine. Also, the EEG obtained during an attack of dysrhythmic migraine differed from the one obtained in ordinary migraine. Patients whose EEGs showed dysrhythmic migraine patterns also frequently had certain clinical and therapeutic features not observed in "ordinary" migraine. Dysrhythmic migraine seems to be related to 1) disturbance of homeostatic mechanisms, and 2) oversensitivity of cerebral control mechanisms to acapnia. The existence of an epileptic "diathesis" in these patients appears to be doubtful.

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