Chronic Electroconvulsive Shock Disrupts Hippocampal Physiology and Impairs Associative Memory in Mice.

Electroconvulsive therapy (ECT) is a highly effective treatment for depression but it has undesirable side effects on various aspects of cognition, including memory. Patients may display retrograde amnesia for autobiographical events and anterograde amnesia in tests of recall and recognition memory. These amnestic effects are likely to depend, at least in part, on changes in the hippocampus. ECT-induced volume increases in the hippocampus and dentate gyrus subregion in particular correlate with the cognitive deficits. However, the precise cellular and behavioral effects of ECT remain poorly understood. Here, we therefore subjected male and female mice to chronic electroconvulsive shock (ECS) and examined effects on hippocampal physiology and memory. Perforant path inputs onto dentate gyrus neurons were examined using whole cell patch clamp recordings in hippocampal slices. In the intact slice, perforant path stimulation did not result in any synaptic or spiking differences in mice given sham versus ECS treatments. However, GABA