title: Electroencephalographic recording during bitemporal and unilateral non-dominant hemisphere (Lancaster Position) electroconvulsive therapy.
abstract: electrical seizure activity induced by ECT appears in three phases: Phase I initial 18-22 Hz. (beta-like) activity, Phase II arrhythmic polyspike activity, and Phase III rhythmic 2 1/2-3 1/2 Hz. spike/polyspike-wave activity. With bitemporal ECT, Phase II activity appears simultaneously in all leads. With unilateral non-dominant hemisphere ECT, there is an orderly march on Phase II polyspikes from the right anterior temporal region. After termination of a seizure, there is symmetrical suppression of normal activity with bitemporal ECT, but with unilateral non-dominant hemisphere ECT there is less suppression of normal activity in the unstimulated side.
mesh_terms: D001921:Brain / Q000502:physiology; D003866:Depressive Disorder / Q000628:therapy; D004565:Electroconvulsive Therapy; D004569:Electroencephalography; D006801:Humans