| 摘要 |
An active implantable medical device, such as a pacemaker, cardioverter and/ or defibrillator of AAI or AAI/DDD type, with detection of ventricular tachycardiae. This device senses spontaneous ventricular and atrial events; delivers atrial pacing pulses; and is able to apply, after delivery of an atrial pacing pulse, concurrently with sensing ventricular events, a refractory period (PR) and a safety window (FS) of predetermined durations; and determining the beginning of a spontaneous ventricular cycle in response to sensing of a ventricular event out of the safety window (R 0, R 1, R 2, R 3 ). It further includes detecting ventricular tachycardiae in response to sensing of ventricular events occurring both within and out of the safety window, conditioned notably by the detection of a sequence of events including, between two consecutive atrial pacing pulses (A 1, A 2; A 2, A 3 ), one ventricular event occurring within the safety window (r 1; r 2 ) and one subsequent ventricular event occurring out of the safety window (R 1, R 2 ).
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