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Does ECT permanently alter seizure threshold?

R B Krueger1, J M Fama, D P Devanand

  • 1Department of Biological Psychiatry, New York State Psychiatric Institute, New York, NY.

Biological Psychiatry
|February 15, 1993
PubMed
Summary
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Electroconvulsive therapy (ECT) does not appear to persistently increase seizure threshold in males. This study found no evidence that prior ECT history altered seizure threshold or duration in depressed patients undergoing treatment.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Clinical Research

Background:

  • Electroconvulsive therapy (ECT) is a psychiatric treatment.
  • Some research suggests ECT may persistently elevate seizure threshold in males.
  • This possibility requires further investigation in clinical populations.

Purpose of the Study:

  • To investigate whether electroconvulsive therapy (ECT) leads to a persistent elevation of seizure threshold in patients.
  • To determine if a history of prior ECT influences seizure threshold or duration during a course of treatment.

Main Methods:

  • Assessed seizure threshold using the method of limits procedure.
  • Evaluated 148 consecutive depressed patients at first and last ECT treatments.
  • Compared patients with and without a history of prior ECT.

Related Experiment Videos

Main Results:

  • No significant difference in initial seizure threshold between patients with and without prior ECT history.
  • No difference in seizure duration (first or averaged) based on prior ECT.
  • The magnitude of seizure threshold increase during the ECT course was similar regardless of prior ECT history.

Conclusions:

  • The study found no evidence to support the hypothesis that ECT causes a persistent elevation of seizure threshold in males.
  • A history of prior ECT was not associated with alterations in seizure threshold or seizure duration in this cohort.
  • Findings suggest ECT's effects on seizure threshold may not be persistent or sex-specific in the studied population.