[Catecholergic ventricular tachycardia. Apropos of a case with associated anomalies of the QTu interval]. / Tachycardie ventriculaire catécholergique. A propos d'un cas avec anomalies associées de l'intervalle QTu.

The case of a patient presenting syncopal catecholergic ventricular tachycardias associated with abnormalities of the interval QTu is reported. EKG at rest shows a normal or sometimes lengthened repolarization. The least effort or emotion produces a His rhythm accompanied with lengthening of QTu. Three stress tests disclose the caricatural picture of a catecholergic ventricular tachycardia. Treatment with quinidin derivatives causes a constant lengthening of QTu without modifying the profile of the stress test. The patient died suddenly. This case seems to represent an intermediate form between catecholergic ventricular tachycardia and the syndrome of long congenital QT.