ACTIVE IMPLANTABLE MEDICAL DEVICE, IN PARTICULAR A CARDIAC STIMULATOR, DEFIBRILLATOR AND / OR CARDIOVERVER, PROVIDED WITH A DOUBLE CHAMBER STIMULATION FUNCTION AND PROTECTS AGAINST ATRIO-VENTRICULAR CROSS-LISTENING PHENOMENES

摘要

P This device comprises means for detecting cardiac events, spontaneous or stimulated, in a first cavity, in particular the atrium, and means of stimulation in a second cavity, in particular the ventricle. It includes means of detection and confirmation of cross listening, to detect in the atrium a signal resulting from a depolarization consecutive to an anterior stimulation of the ventricle, and to distinguish such a signal from a signal resulting from an activity spontaneous atrium. According to the invention, these cross-listening detection means comprise means for: - detecting an activity of the atrial extra-systole type occurring between ventricular stimulation and a consecutive atrial event, stimulated or spontaneous, for: - determining that the time interval between stimulation of the second cavity and the extrasystole is less than a predetermined duration, and - detect the stability of this interval, in particular by varying the atrioventricular delay and to detect the absence of modification significant, with respect to these variations, of the time interval in question. /P