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Third heart sound activity index for heart failure monitoring

  • US 8,840,563 B2
  • Filed: 07/02/2013
  • Issued: 09/23/2014
  • Est. Priority Date: 12/24/2003
  • Status: Active Grant
First Claim
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1. An implantable medical system, comprising:

  • a sensing circuit configured to sense at least one electrogram;

    a cardiac event detector coupled to the sensing circuit and configured to produce a cardiac signal using the at least one electrogram, the cardiac signal indicative of heart beats;

    an acoustic sensor configured to sense an acoustic signal indicative of third heart sounds (S3); and

    a heart sound analyzer circuit coupled to the acoustic sensor and the cardiac event detector, the heart sound analyzer including;

    an S3 index calculator configured to calculate an S3 index including a ratio of a number of S3 beats detected during a predetermined time period to a number of the heart beats detected during the predetermined time period; and

    an S3 trend generator configured to generate a trend of S3 index using a plurality of S3 indices calculated over a plurality of measurement periods; and

    a heart failure event detector configured to detect heart failure using the trend of S3 index.

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