Heart sounds template comparison to identify true pacing mode

摘要

An apparatus may include an implantable therapy circuit that provides bi-ventricular pacing to a subject, a heart sound signal sensing circuit that produces a sensed heart sound signal that is representative of at least one heart sound associated with mechanical cardiac activity, a memory circuit to store one or more heart sound templates of cardiac capture, and a comparison circuit that compares a segment of the sensed heart sound signal to the one or more heart sound templates of cardiac capture to identify ventricles in which cardiac capture was induced by the bi-ventricular pacing. In some situations, an indication of the ventricles in which cardiac capture was induced may be generated according to the comparison.

主权项

1. An apparatus comprising:
an implantable therapy circuit configured to provide a bi-ventricular pacing pulse to a subject as part of cardiac pacing therapy, wherein the bi-ventricular pacing pulse includes providing an electrical stimulation pulse to a right ventricle and an electrical stimulation pulse to a left ventricle; a heart sound signal sensing circuit configured to produce a sensed heart sound signal that is representative of at least one heart sound associated with mechanical cardiac activity of a subject; a memory circuit configured to store one or more heart sound templates of cardiac capture; and a comparison circuit configured to:
compare a segment of the sensed heart sound signal to a template heart sound signal representative of ventricular contraction resulting from intrinsic depolarization and at least one of a template heart sound signal representative of right ventricle (RV) capture only, a template heart sound signal representative of left ventricle (LV) capture only, and a template heart sound signal representative of bi-ventricular capture;identify ventricles in which cardiac capture was induced by the bi-ventricular pacing pulse; andgenerate an indication of the ventricles in which capture was induced or an indication of no cardiac capture of a ventricle according to the comparison and providing the indication to at least one of a user or process.