Relations of QTc prolongation on the electrocardiogram to torsades de pointes: definitions and mechanisms.


Antiarrhythmic drug-induced ventricular tachyarrhythmias have traditionally been identified on the basis of prolongation of the QT interval and the appearance of undulating peaks of sequential QRS complexes and T waves that give the tachycardia a "twisting" aspect (so-called torsades de pointes). It is now understood, however, that a precise lengthening of… (More)


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