Patent ID: 8676314
Filing Date: 2014-03-18
Classification: A61N

Abstract:
1. A cardiac therapy system capable of delivering cardiac resynchronization therapy (CRT) that includes pacing at least the left ventricle, the system comprising: electrodes configured to electrically couple to right and left ventricles; sensing circuitry configured to sense cardiac signals via the electrodes, the cardiac signals including intrinsic depolarization signals; pacing circuitry configured to generate pacing pulses deliverable through the electrodes; cardiac response classification circuitry configured to determine cardiac responses to the pacing pulses; and pacing control circuitry configured to control the pacing circuitry, the pacing control circuitry configured to schedule delivery of CRT pacing to at least one ventricle relative to a pacing delay for the ventricle during a cardiac cycle, and, if an intrinsic depolarization is detected during the pacing delay, to inhibit the scheduled CRT pacing to the ventricle, to measure an intrinsic interval of the ventricle, which is concluded by the intrinsic depolarization, and to decrease a subsequent pacing delay of the ventricle for a subsequent cardiac cycle to be less than or equal to the measured intrinsic interval, wherein to measure the intrinsic interval and to decrease the subsequent pacing delay are performed on a beat by beat basis.