Patent ID: 7194307
Filing Date: 2007-03-20
Classification: A61N

Abstract:
1. An implantable cardiac device, comprising: one or more sensing channels for sensing cardiac electrical activity at one or more myocardial sites; one or more pacing channels for delivering pacing pulses to one or more myocardial sites; a controller for controlling the delivery of pacing pulses in accordance with a demand pacing mode; and, wherein the controller is programmed to count the number of paced and intrinsic beats over a defined time interval and to intermittently reduce the extent of pacing in order to maintain a desired maximum ratio of paced to intrinsic beats and to dynamically adjust the desired maximum ratio of paced to intrinsic beats in accordance with a determination of an amount of interventricular conduction delay such that the desired maximum ratio is decreased if the amount of interventricular conduction delay increases.