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[Syncopal attacks due to ventricular tachyarrhythmias ("torsade de pointe type") in a patient with a PM of hysteresis type (author's transl)].

The authors report on a patient with artificial ventricular pacemaker with hysteresis, who suffered from ventricular fibrillation known as "torsade de pointe" and ventricular flutter, often accompanied by lipothymias, with hypokalemia. The following points are considered: the pacemaker responsibility to produce arrhythmia; the pacemaker behaviour during ventricular tachyarrhythmias; the modifications of stimulation threshold and R-wave sensitivity after PM removal and the following hours.