Archives des maladies du coeur et des vaisseaux
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Polymorphic ventricular tachycardia is defined as constant change of the QRS morphology. The diagnosis has important etiological, therapeutic and prognostic implications. ⋯ Polymorphic ventricular tachycardia is classified according to the absence or presence of underlying cardiac disease respectively as torsades de pointe with long QT, torsades de pointe with a short coupling interval and catecholamine-induced ventricular tachycardia of childhood on the one hand, and, iatrogenic torsades de pointe, ventricular tachycardia in acute or chronic infarction and other cardiac diseases, on the other hand. Finally, the authors discuss the problem of polymorphic ventricular tachycardia induced by programmed ventricular stimulation.