Patent ID: 7471981

Claim:
A cardiac pacing method, comprising: providing a plurality of atrioventricular delays, including a sensed atrioventricular delay (SAV); providing a pacing timing sequence that includes a post ventricular atrial refractory period (PVARP); delivering ventricular pacing therapy to left and right ventricles using the pacing timing sequence; detecting interrupted ventricular pacing; responsive to detecting interrupted ventricular pacing, modifying the pacing timing sequence and using the modified pacing timing sequence, the modified pacing timing sequence configured to restore the ventricular pacing by allowing sensing and tracking of non-refractory intrinsic atrial depolarizations; scheduling pacing to the ventricles using the SAV following a non-refractory intrinsic atrial depolarization sensed during a cardiac cycle in which the modified pacing timing sequence is used; and inhibiting the scheduled pacing to the ventricles if an intrinsic ventricular depolarization is sensed during the SAV.