Patent ID: 7310554

Claim:
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 which includes: an atrial sensing channel for generating electrogram signals corresponding to electrical activity in an atrium; right and left ventricular sensing channels for generating electrogram signals corresponding to electrical activity in the right and left ventricles, respectively; right and left ventricular pacing channels for delivering pacing pulses to the right and left ventricles, respectively; a controller for controlling the output of pacing pulses and interpreting electrogram signals, wherein the controller is programmed to deliver a left ventricular pace and a right ventricular pace separated by a programmed biventricular offset interval in accordance with a demand pacing mode; and, a telemetry interface; an external programmer with associated display and input means in communication with the implantable device via the telemetry interface; wherein the system is programmed to generate signals from which the delay between right ventricular and left ventricular activation during an intrinsic beat, referred to as the Δ RL interval, may be measured; and, wherein the system is programmed to compute an optimum biventricular offset interval in accordance with a formula which expresses the optimum biventricular offset interval as a function of the measured Δ RL interval.