Cardiac response classification using multiple classification windows

摘要

Methods and devices for classifying a cardiac response to pacing involve establishing a plurality of classification windows relative to and following a pacing pulse. One or more characteristics of a cardiac signal sensed following the pacing pulse are detected within one or more particular classification windows. The characteristics may be compared to one or more references. Classification of the cardiac response may be performed based on the comparison of the one or more characteristics to the one or more references and the particular classification windows in which the one or more characteristics are detected.

主权项

1. A method of operating an implantable cardiac device to classify a cardiac response to a pacing pulse, comprising:
sensing cardiac electrical activity following the pacing pulse and providing a cardiac electrical activity signal corresponding to the cardiac electrical activity; analyzing the cardiac electrical activity signal in multiple classification time intervals; detecting a peak of the cardiac electrical activity signal in a classification time interval of the multiple classification time intervals; comparing the cardiac electrical activity signal to a morphological template representative of a non-captured, intrinsic beat; classifying the cardiac pacing response based the comparison of the cardiac electrical activity signal to the intrinsic template, including identifying the cardiac pacing response as an intrinsic beat in response to the cardiac electrical activity signal being correlated to the intrinsic template and further identifying the cardiac pacing response as one of responses that do not include intrinsic beats in response to the cardiac electrical activity signal not being correlated to the intrinsic template, and further based on the classification time interval in which the peak of the cardiac electrical activity signal is detected; and controlling delivery of pacing therapy based at least in part on classification of the cardiac pacing response.