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Detecting heart failure by monitoring the time sequence of physiological changes

  • US 10,039,499 B2
  • Filed: 07/21/2016
  • Issued: 08/07/2018
  • Est. Priority Date: 12/15/2010
  • Status: Active Grant
First Claim
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1. A system to detect a condition of worsening heart failure, the system comprising:

  • a state machine circuit, configured to receive information about different first and second physiological characteristics of a subject, wherein the state machine comprises;

    a state sequence of at least first, second, and third states, wherein a state represents a physiological status of the subject, and wherein the first state includes a status of post-S2 heart sound energy in a sensed electrical heart sound signal and the third state corresponds to a worsening heart failure event of the subject;

    a first forward state transition from the first state to the second state in response to a first transition trigger, wherein the first transition trigger includes a change in the post-S2 heart sound energy;

    a first reverse state transition from the second state to the first state in response to first of expiration of a first timer and ceasing of the first transition trigger;

    a second forward state transition from the second to the third state in response to a second transition trigger associated with worsening heart failure status of the subject; and

    a second reverse state transition from the third state to the second state in response to first of expiration of a second timer and ceasing of the second transition trigger, and generating an alert indicating worsening heart failure event of the subject otherwise.

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