Patent ID: 9020596
Filing Date: 2015-04-28
Classification: A61N

Abstract:
1. A method for operating a cardiac rhythm management device, comprising: performing a capture threshold determination procedure by: delivering a pacing pulse to a cardiac site; recording a test electrogram after delivery of the pacing pulse; classifying the test electrogram as representing a capture beat, a fusion beat, or a non-capture beat; initiating delivery of pacing pulses with a pacing pulse energy that achieves capture and decreasing the pacing pulse energy of each successive pacing pulse until the lowest energy pacing pulse that results in a test electrogram classified as a capture beat is found, wherein test electrograms classified as fusion beats are disregarded; wherein the test electrogram is classified as a capture beat if the test electrogram meets both an amplitude criterion that specifies a peak amplitude and a location criterion that specifies a time window within which the peak amplitude must occur; wherein the test electrogram is classified as a non-capture beat if asystole is detected; wherein the test electrogram is classified as a fusion beat if it cannot be classified as either a capture beat or a non-capture beat; and, wherein the test electrogram is also classified as a capture beat if: 1) a non-zero number of immediately preceding test electrograms have been classified as fusion beats, and 2) the test electrogram meets only one of either the amplitude criterion or the location criterion.