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Thyrotropin-releasing hormone administration does not affect seizure threshold during electroconvulsive therapy
Iannis M Zervas1, Yiannis G Papakostas, Maria A Theodoropoulou
1Department of Psychiatry, Athens University Medical School, Eginition Hospital, 72-74 Vas Sophias Avenue, Athens, Greece. zervas@compulink.gr
The Journal of ECT
|September 16, 2003
Summary
Thyrotropin-releasing hormone (TRH) did not alter seizure threshold or duration in depressed patients undergoing electroconvulsive therapy (ECT). These findings do not support a role for exogenous TRH in seizure modulation during ECT.
Area of Science:
- Neuroendocrinology
- Psychiatry
- Clinical Neurophysiology
Background:
- Thyrotropin-releasing hormone (TRH) is hypothesized to play a role in seizure modulation.
- The precise function of TRH in seizure activity remains unclear.
Purpose of the Study:
- To investigate the effects of exogenous TRH administration on seizure threshold and duration.
- To examine TRH's influence in depressed patients undergoing electroconvulsive therapy (ECT).
Main Methods:
- A balanced order crossover design was used in 13 depressed inpatients.
- TRH (0.4 mg IV) or placebo was administered before anesthesia during bilateral ECT sessions.
- Seizure threshold was determined by a titration procedure; seizure duration was measured by EEG and cuff methods.
Main Results:
- No significant differences were observed in seizure threshold between TRH and placebo conditions.
- Seizure duration, measured by both EEG and cuff methods, did not differ between TRH and placebo.
- These results were consistent regardless of TRH/placebo order or baseline TSH response.
Conclusions:
- Exogenous TRH administration does not appear to modulate seizure threshold or duration in this ECT patient cohort.
- The study does not support a significant role for TRH in seizure modulation under these experimental conditions.
- Potential effects of TRH on seizures may be masked by pharmacokinetic factors or other mechanisms.