Patent ID: 7979124

Claim:
A body implantable system, comprising: a lead system comprising a coronary vein electrode and one or more ventricular or atrial electrodes, the lead system being adapted to position the coronary vein electrode adjacent multiple heart chambers; a pacing pulse generator coupled to the lead system, the pacing pulse generator configured to deliver sequential stimulation signals during a cardiac cycle to a left and right ventricle or a left and right atrium of a patient's heart via at least the one or more ventricular or atrial electrodes; a detector coupled to the lead system, the detector comprising a coronary vein sense amplifier configured to receive, from a single sense vector including the coronary vein electrode, a cardiac signal sensed by the single sense vector including the coronary vein electrode following the stimulation signals; and a control circuit coupled to the detector, the control circuit configured to use the cardiac signal to detect capture of the ventricles or atria; wherein the control circuit is configured to differentiate between capture in multiple heart chambers and capture in a single heart chamber from the sequential stimulation signals delivered during the cardiac cycle using the cardiac signal sensed by the single sense vector including the coronary vein electrode without using a signal received from another sense vector to differentiate between capture in multiple heart chambers and capture in a single heart chamber.