Detecting sleep disorders in an active medical device, in particular, an implantable device such as a cardiac pacemaker, a defibrillator, a cardiovertor or a multisite device

Abstract

An active medical device, in particular an implantable device such as a cardiac pacemaker, a defibrillator, a cardioverter, or a multisite device, which includes a function for determining sleep disorders. This device is able to collect the heartbeat rate in at least one cavity of the heart, and analyze the rate to evaluate a value of heartbeat rate according to the rate thus collected. The device is able to discriminate in the collected heartbeat rate the spontaneous events sinusal in origin, and to evaluate the heart rate according only to these spontaneous sinusal events, and to analyze the variations in time of the aforementioned heart rate to determine the presence of a sleep respiratory disorder according to these variations. This analysis can be carried out by a search for episodes of bradycardia followed by episodes of tachycardia, or by determination of an index of sinusal variability that is a function of the detected variations and comparison of this index with a predetermined threshold.

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