Monitoring of heart sounds

摘要

This document discusses, among other things, a system comprising an implantable medical device (IMD) including an implantable heart sound sensor circuit configured to produce an electrical heart sound signal representative of a heart sound of a subject and a processor circuit. The processor circuit is coupled to the heart sound sensor circuit and includes a detection circuit, a heart sound feature circuit and a trending circuit. The detection circuit configured to detect a physiologic perturbation and the heart sound feature circuit is configured to identify a heart sound feature in the electrical signal. The processor circuit is configured to trigger the heart sound feature circuit in relation to a detected physiologic perturbation. The trending circuit is configured to trend the heart sound feature in relation to a recurrence of the physiologic perturbation. The processor circuit is configured to declare a change in a physiologic condition of the patient according to the trending.

主权项

1. A system comprising:
an implantable heart sound sensor circuit configured to produce an electrical heart sound signal representative of a heart sound of a subject; a physiological sensor configured to produce a physiological signal representative of activity of the subject; a processor circuit coupled to the heart sound sensor circuit and the second sensor circuit, wherein the processor circuit includes:
a detection circuit configured to detect a change in phase of a circadian cycle of the subject using the physiological signal;a heart sound feature circuit configured to identify a heart sound feature in the electrical heart sound signal in relation to a specified phase of the circadian cycle; anda trending circuit configured to trend the identified heart sound feature during the specified phase of the circadian cycle, and wherein the processor circuit is configured to generate an indication of a change in a physiologic condition of the subject according to the trend and provide the indication to a user or process.