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Background: The prolongation of the QRS complex of the electrocardiogram (ECG) can predict arrhythmic events after myocardial infarction; we investigated the hypothesis that QRS prolongation can be caused by ventricular dilatation in a canine model of pacing-induced heart failure. Method: Pacemakers were implanted in 23 dogs. The right ventricle was paced at 240 bpm for periods ranging between 4 and...
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