Patent ID: 8214034
Filing Date: 2012-07-03
Classification: A61N

Abstract:
1. A system for generating pacing pulses deliverable to a heart, comprising: a ventricular sensing circuit configured to detect signals indicative of intrinsic ventricular depolarizations (R-waves); an atrial sensing circuit configured to detect signals indicative of P-waves; a pulse generator configured to generate pacing pulses deliverable to one or both ventricles; a post ventricular atrial refractory period (PVARP) timing circuit, the PVARP timing circuit configured to time PVARPs relative to the detected ventricular depolarizations and the ventricular pacing pulses; a controller coupled to the sensing circuits, the timing circuits, and the pulse generator, the controller configured to implement, responsive to detection of an intrinsic ventricular depolarization, a ventricular tracking protocol for a plurality of cardiac cycles, for each cardiac cycle of the plurality of cardiac cycles the ventricular tracking protocol configured to: initiate the AV pacing interval in response to the P-wave detected outside the PVARP, and deliver, via the pulse generator, the ventricular pacing pulse at the end of the AV interval.