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European Archives of Psychiatry and Clinical Neuroscience

, Volume 263, Issue 2, pp 167–175

First Online: 15 July 2012Received: 01 April 2012Accepted: 30 June 2012


At the start and during the course of electroconvulsive therapy ECT, estimation of the seizure threshold ST is useful in weighing the expected effectiveness against the risks of side effects. Therefore, this study explores clinical factors predicting initial ST IST and levels of ST during the ECT course. This prospective observational study included patients aged ≥18 years receiving ECT without contraindications for dose titration. At the first and every sixth consecutive ECT session, ST level was measured. Using multivariate linear regression and multilevel models, predictors for IST and change in ST levels were examined. A total of 91 patients mean age, 59.1 ± 15.0 years; 37 % male; 97 % diagnosis of depression were included. In multivariable analysis, higher age β = 0.24; P = 0.03 and bifrontotemporal BL electrode placement β = 0.42; P < 0.001 were independent predictors for higher IST, explaining 49 % of its variation. Also, these two variables independently predicted higher ST levels at different time points during the course. Using multilevel models, absence of a previous ECT courses predicted a steeper rise in ST during the course P = 0.03 for the interaction term time*previous ECT. The age-adjusted dose-titration method is somewhat crude, resulting in some measurement error. Concomitant medication use could have influenced ST levels. Increasing age and BL electrode placement predicted higher IST, which should be taken into account when selecting ECT dosage. Previous ECT courses may avoid an increase in ST during the course of ECT.

KeywordsECT Initial seizure threshold Predictors Prospective study  Download fulltext PDF

Autor: Jeroen A. van Waarde - Lucas J. B. van Oudheusden - Bastiaan Verwey - Erik J. Giltay - Rose C. van der Mast


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