Patent ID: 6763267
Filing Date: 2004-07-13
Classification: A61N

Abstract:
A cardiac pacemaker, comprising;an atrial sensing channel for sensing electrical events occurring in an atrium; first and second ventricular sensing channels for sensing electrical events occurring at first and second ventricular locations; a ventricular pacing channel and a controller for pacing a ventricle in response to sensed events and lapsed time intervals in a mode such that the ventricle is paced at a programmed AV interval after an atrial sense or pace; circuitry for detecting R waves in the ventricular sensing channels following detection of a P wave due to a detected atrial depolarization; circuitry for measuring first and second PR intervals associated with the first and second ventricular sensing channels, and calculating a conduction delay value as the difference between the first and second PR intervals; and, wherein the controller is programmed to decrease or increase the programmed AV interval in accordance with an increase or decrease, respectively, of an average of conduction delays measured over a period of time.