Patent ID: 7016729
Filing Date: 2006-03-21
Classification: A61N

Abstract:
1. A cardiac rhythm management device, comprising: a controller for controlling the delivery of paces to heart chambers designated as a rate chamber and a synchronized chamber in accordance with a programmed pacing mode; and, a rate chamber sensing channel for detecting senses indicating intrinsic activity in the rate chamber; wherein the controller is programmed with executable instructions for: detecting a tachyarrhythmia when a time interval between successive rate chamber senses is below a specified tachyarrhythmia rate threshold interval; pacing the synchronized and rate chambers with a negative offset such that the rate chamber is paced upon expiration of an escape interval and a preceding pace is delivered to the synchronized chamber at a pacing instant defined by a negative offset interval, wherein the escape interval is reset by a rate chamber pace or a rate chamber sense, and wherein a pacing interval, defined as the interval between a rate chamber pace or sense and expiration of an escape interval, is constrained by a specified maximum pacing rate to be no shorter than the specified tachyarrhythmia rate threshold interval; and, rendering the rate chamber sensing channel refractory for a post-sense refractory period after a rate chamber sense and for a post-pace refractory period after a rate chamber pace, wherein the post-pace refractory period is shorter than the post-sense refractory period.