Patent ID: 8214036

Claim:
An active implantable medical device of the cardiac pacemaker, resynchronization, cardioversion and/or defibrillation type, comprising: means for producing low energy atrial stimulation pulses (P) to be applied to an electrode implanted on the atrial cavity of a patient; and means for detecting an occurrence of an atrial contraction after the application of an atrial stimulation pulse P, said means comprising: an acceleration sensor having an endocardiac acceleration output (EA) signal representative of movements produced by the contractions of the atrial cavity; means for analyzing the EA signal to recognize and isolate in the EA signal an EA 4 component corresponding to a fourth peak of endocardiac acceleration associated to the atrial activity, including means for determining the presence or absence of said EA 4 component, the presence of said EA 4 component being representative of an atrial capture and the absence of said EA 4 component being representative of an atrial loss of capture; and means for quantifying a parameter of the EA signal within at least one analysis time window, wherein the at least one analysis time window is triggered to begin at or after the moment of application of the atrial stimulation pulse (P), and terminate before a second specific event, and the quantified parameter is representative of energy of the EA signal over the duration of the at least one analysis time window.