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Related Experiment Videos

Differences Between First and Second Electroconvulsive Treatments Given in the Same Session.

Gunnar Larson1, Conrad M. Swartz

  • 1Department of Psychiatry, UHS/Chicago Medical School, and V. A. Medical Center, North Chicago, Illinois, USA.

Convulsive Therapy
|January 1, 1986
PubMed
Summary
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The second electroconvulsive therapy (ECT) seizure under anesthesia showed less correlation between measured phenomena than the first. This suggests the second seizure is physiologically different and less widespread in the brain.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Medical Physiology

Background:

  • Electroconvulsive therapy (ECT) is a medical procedure most often used for patients with severe major depression or bipolar disorder that has not responded to other treatments.
  • Bilateral ECT involves stimulating both cerebral hemispheres.
  • Understanding seizure characteristics in ECT is crucial for optimizing treatment efficacy and safety.

Purpose of the Study:

  • To compare the physiological characteristics of seizures induced by the first and second bilateral electroconvulsive therapy (ECT) sessions administered under the same anesthesia.
  • To investigate whether the seizure generalization differs between the first and second ECT in a single anesthetic session.

Main Methods:

  • Measurements of tonic-clonic motor activity, paroxysmal electroencephalogram (EEG) activity, EEG spike waves, and tachycardia were taken during ECT.

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  • Data were collected from 14 patients undergoing 36 pairs of bilateral ECT sessions under identical anesthesia.
  • Pearson correlation coefficients were calculated for six pairs of these four seizure measures for both the first and second ECTs.

    • Main Results:

    • Correlation coefficients between seizure-induced phenomena were significantly higher for the first ECT compared to the second ECT (p < 0.05 to p < 0.001).
    • This indicates a stronger association between different physiological measures during the first seizure.
    • The reduced correlation for the second ECT suggests a less generalized seizure response.

    Conclusions:

    • The seizure induced by the second ECT under the same anesthesia exhibits distinct physiological properties compared to the first.
    • Results suggest that the second ECT seizure is less well-generalized throughout the brain.
    • Further research may explore the implications of these findings for ECT treatment protocols and patient outcomes.