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Monitoring of heart sounds

  • US 8,801,624 B2
  • Filed: 10/18/2013
  • Issued: 08/12/2014
  • Est. Priority Date: 11/20/2006
  • Status: Active Grant
First Claim
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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; and

    a trending circuit configured to trend the identified heart sound feature during the specified phase of the circadian cycle, andwherein 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.

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