Patent attributes
An active implantable medical device that is able to perform an atrial capture test. The device includes circuits for delivering atrial stimulation pulses, and testing atrial capture, namely to detect the occurrence of an atrial contraction after the application of an atrial stimulation pulse. An acceleration sensor is used to deliver an EA signal representative of the movements produced by the contractions of the atrial cavity. The EA signal is analyzed to recognize and isolate in this EA signal a component EA4 corresponding to the fourth endocardiac acceleration peak (PEA4) associated with the atrial activity. The presence or absence of this component EA4 is used to define the atrial capture or loss of capture. The signal analysis preferably quantifies an EA parameter (T, T+D), such as the energy of the EA signal within analysis time windows, each having duration D, of successive analysis (W1 . . . Wn) triggered after the atrial stimulation (P) and ending before a ventricular detection or stimulation.
