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Related Experiment Videos

Electroconvulsive therapy and the seizure threshold.

B A Martin, S Strigler, K Bezchlibnyk

    Canadian Journal of Psychiatry. Revue Canadienne De Psychiatrie
    |October 1, 1983
    PubMed
    Summary
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    Electroconvulsive therapy (ECT) using pulsatile square wave stimulus proved more difficult for inducing seizures than sine wave stimulus. However, reduced electrical energy use with pulsatile stimulus may still offer benefits.

    Area of Science:

    • Neurology
    • Psychiatry
    • Medical Devices

    Background:

    • Electroconvulsive therapy (ECT) is a medical treatment most often used for patients with severe major depression or bipolar disorder that has not responded to other treatments.
    • Sine wave and pulsatile square wave stimuli are commonly used in ECT, with literature suggesting comparable efficacy.
    • Clinical practice variations may influence seizure induction and treatment outcomes.

    Purpose of the Study:

    • To compare the efficacy and challenges of pulsatile square wave stimulus versus sine wave stimulus in electroconvulsive therapy (ECT) under routine clinical conditions.
    • To investigate variables affecting seizure threshold during ECT with different waveforms.
    • To evaluate the overall benefit-risk profile of pulsatile square wave stimulus in ECT.

    Main Methods:

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    • A large series of electroconvulsive treatments were conducted comparing pulsatile square wave stimulus to sine wave stimulus.
    • Seizure induction success rates were meticulously recorded for both stimulus types.
    • Potential variables influencing seizure threshold, such as patient factors and device settings, were examined.

    Main Results:

    • Inducing a convulsion was significantly more difficult using the pulsatile square wave stimulus.
    • The rate of failure to induce a seizure was four times higher with pulsatile square wave stimulation compared to sine wave stimulation.
    • Despite challenges, pulsatile stimulus reduced electrical energy delivered to the patient.

    Conclusions:

    • The pulsatile square wave stimulus presents a higher threshold for seizure induction in ECT compared to sine wave stimulus.
    • The reduction in electrical energy transmitted to the patient with pulsatile stimulus may outweigh the increased difficulty in achieving a therapeutic seizure.
    • Further research may be warranted to optimize pulsatile square wave parameters for improved clinical utility in ECT.