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Detection of worsening heart failure events using heart sounds

  • US 10,085,696 B2
  • Filed: 10/05/2016
  • Issued: 10/02/2018
  • Est. Priority Date: 10/08/2015
  • Status: Active Grant
First Claim
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1. A system, comprising:

  • a signal sensor circuit, including a sense amplifier circuit to sense a heart sound (HS) signal from a patient;

    a memory circuit;

    a HS component detector circuit, coupled to the signal sensor circuit and the memory circuit to detect at least first and different second HS components from the received HS signal;

    a HS metric generator circuit, coupled to the HS component detector circuit to use the detected first and second HS components to respectively generate first and second HS metrics stored in the memory circuit;

    a blending circuit, coupled to the memory circuit or the HS metric generator circuit to generate one or more composite HS metrics using a ratio of the second HS metric to the first HS metric or a product of the first and second HS metrics;

    a heart failure (HF) event detector circuit, including a comparator circuit coupled to the blending circuit to detect a worsening HF status using a combination of (1) at least one of the first or second HS metric and (2) at least one of the one or more composite HS metrics; and

    an output circuit configured to output an indication of the worsening HF status.

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