Patent ID: 8929983
Filing Date: 2015-01-06
Classification: A61N

Abstract:
1. A cardiac device, comprising: one or more sensing amplifiers for sensing electrical cardiac activity through one or more sensing channels; one or more pulse generators for delivering pacing pulses to one or more myocardial sites through one or more pacing channels; an exertion level sensor for measuring exertion level; a controller programmed to operate the device in either a normal operating mode or an intermittent pacing therapy (IPT) mode; wherein, in the IPT mode, the controller is programmed to deliver paces to the one or more myocardial sites using a pacing mode that results in some degree of dyssynchrony as compared with the normal operating mode; wherein the controller is programmed to intermittently switch to the IPT mode that delivers ventricular pacing pulses with an escape interval initially set to a specified IPT value; wherein the controller is programmed to switch to a non-atrial tracking IPT mode if the measured exertion level is below a specified value and switch to an atrial tracking IPT mode otherwise; wherein, when operating in the IPT mode, the controller is further programmed to monitor for senses that inhibit the ventricular pacing pulses and, after a specified number of such senses have occurred, further shorten the escape interval from the IPT value; and, wherein the controller is further programmed to continue operating in the IPT mode without shortening the escape interval if the escape interval has been shortened to a specified minimum limit value.