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(A) The ECG of a middle aged woman who was otherwise healthy but suffered a ventricular fibrillation cardiac arrest while receiving 20 mg daily of thioridazine. This ECG was recorded immediately after the cardiac arrest. Note the prolonged T wave offset resulting in a prolonged QTc interval of 619 ms. (B) The ECG of the same patient three days after the withdrawal of thioridazine (QTc = 399 ms).
