Patent ID: 8306622

Claim:
A cardiac function management device comprising: a pacing circuit comprising a coronary sinus pacing electrode configured to be inserted via a coronary sinus of a heart of a subject, the coronary sinus pacing electrode configured to pace a first atrial chamber; a sensing circuit configured to sense an atrial depolarization associated with a different second atrial chamber; a measurement circuit, coupled to the pacing circuit and the sensing circuit, the measurement circuit configured to: perform a first measurement of a parameter of the second atrial chamber depolarization in the absence of pacing from the coronary sinus pacing electrode, wherein the second atrial chamber depolarization is sensed in the absence of pacing from the coronary sinus pacing electrode; and perform a second measurement of the same parameter of the second atrial chamber depolarization in the presence of pacing from the coronary sinus pacing electrode, wherein the second atrial chamber depolarization is sensed in the presence of pacing from the coronary sinus pacing electrode; and a controller circuit, coupled to the measurement circuit, the controller circuit configured to compare a change between the first and second measurements to a criterion, and when the change meets the criterion, to declare that the first atrial chamber has been captured by the pacing from the coronary sinus pacing electrode.