2-1-102. Changes in corrected QT interval during electroconvulsive therapy

Corrected QT interval (QTc) prolongation can trigger ventricular arrhythmia, including torsade de pointes (TdP). A QTc greater than 500ms is considered to provide a high risk of TdP. Herein, we evaluated the risk of TdP during electroconvulsive therapy (ECT) using QTc. Twenty-two patients who underwent ECT were included. QTc were calculated with Hodges formula to avoid overcorrection of heart rate in a total of 201 ECT sessions. Baseline QTc was averaged over 30 s before stimulus onset. A QTc >457ms was classified as a significant prolongation, and >500ms as marked prolongation.

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