Patent ID: 8126547
Filing Date: 2012-02-28
Classification: A61N

Abstract:
1. A system for setting one of more pacing parameters used by an implantable cardiac rhythm management device in delivering cardiac resynchronization therapy, comprising: an implantable cardiac rhythm management device that includes: sensing channels for generating electrogram signals corresponding to electrical activity in an atrium, the right ventricle, and the left ventricle; right and left ventricular pacing channels for delivering pacing pulses to the right and left ventricles, respectively; a controller for interpreting electrogram signals and controlling the output of pacing pulses in a programmed pacing mode; and a telemetry interface; an external programmer in communication with the implantable device via the telemetry interface; wherein the system is programmed to measure at least one intrinsic atrio-ventricular delay (AVD) interval from electrogram signals during an intrinsic beat and compute an optimum AVD interval for delivering ventricular pacing in an atrial tracking or AV sequential pacing mode in accordance with a formula which expresses the optimum AVD interval as a function of the measured intrinsic AVD interval; wherein the system is programmed to measure the delay between right ventricular and left ventricular activation during an intrinsic beat, referred to as the Δ and, wherein the system is programmed to select between a left ventricle-only pacing mode, a right ventricle-only pacing mode, and a biventricular pacing mode based upon the computed optimum BVO and AVD intervals.