SINGLE CHAMBER IMPLANTABLE MEDICAL DEVICE FOR CONFIRMING ARRHYTHMIA THROUGH RETROSPECTIVE CARDIAC SIGNALS

摘要

An implantable medical device is provided that comprises a housing, sensors configured to be located to proximate a heart, and a sensing module to sense cardiac signals originating from the heart over a channel defined by the sensors. The cardiac signals include intrinsic R-wave events and associated intrinsic confirmation events when the heart exhibits normal sinus rhythm. The device further includes memory to store the cardiac signals sensed over a channel, and a detection module. The detection module identifies an R-wave event within the cardiac signals. The detection module captures, in the memory, a segment of the cardiac signals that precedes the R-wave event as a retrospective segment. The detection module determines whether the retrospective segment includes an intrinsic confirmation event that is associated with and occurs before the R-wave event. The detection module declares an arrhythmia based at least in part on the determination of whether the retrospective segment includes the intrinsic confirmation event is absent from the retrospective segment.