Patent ID: 7805192

Claim:
A cardiac pacemaker, comprising: an atrial sensing channel for sensing atrial depolarizations and generating atrial sense signals in accordance therewith; one or more ventricular sensing channels for sensing ventricular depolarizations and generating ventricular sense signals in accordance therewith; right and left pacing channels for delivering paces to the right and left ventricles; a controller for controlling the delivery of paces and detecting tachyarrhythmias; wherein the controller is configured to operate in a normal pacing mode that does not include resynchronization pacing when no atrial tachyarrhythmia is detected; and, wherein the controller is configured to switch the pacemaker to an atrial fibrillation pacing mode upon detection of an atrial tachyarrhythmia, and wherein the atrial fibrillation pacing mode includes resynchronization pacing that paces the left ventricle.