Torsade de pointes after amiodarone withdrawal; effects of mild hypokalaemia on repolarization.

Recurrent atypical ventricular tachycardia, with a long QT interval, was documented in a 56-year-old patient 16 days after discontinuing amiodarone 200 mg and 400 mg on alternate days. Tachycardia and variable prolongation of myocardial repolarization were abolished by temporary cardiac pacing and correction of mild hypokalaemia.