Background: Electroconvulsive therapy (ECT) is still considered the most effective biological treatment strategy in psychiatric disorders. However, the clinical efficacy of ECT may be affected by stimulus variables and the concomitant use of psychopharmacological medication. Furthermore, most anaesthetics have anticonvulsant properties and therefore might additionally influence the efficacy of ECT.
Method: In order to explore whether different anaesthetics might alter the effectiveness or safety of ECT we retrospectively analyzed 5482 ECT treatments in 455 patients. Anaesthetics were chosen according to clinical reasons and comprised thiopental, methohexital, propofol and etomidate.
Results: Seizure duration was significantly affected by the anaesthetic medication with longest seizure activity during thiopental anaesthesia. In addition, postictal suppression, a further prospective parameter of ECT effectiveness, was significantly higher during propofol and thiopental anaesthesia. The clinical effectiveness was significantly better during propofol and thiopental anaesthesia. In contrast, the overall safety did not differ between the anaesthetic groups.
Conclusion: Our study supports the hypothesis that inducting anaesthetic agents have a different impact on seizure duration, ictal and postictal electrophysiological indices and clinical efficacy of ECT. Compared to thiopental, which has been established as a standard anaesthetic during ECT, also the modern anaesthetic propofol is a suitable inducting agent.
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