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Automatic heart rate diagnostics

  • US 10,335,047 B2
  • Filed: 05/24/2017
  • Issued: 07/02/2019
  • Est. Priority Date: 08/02/2016
  • Status: Active Grant
First Claim
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1. A medical device system comprising:

  • sensing circuitry configured to sense a cardiac electrogram signal of a patient via a plurality of electrodes and generate a signal that varies as a function of movement and posture of the patient; and

    processing circuitry configured to, for each of a plurality of periods;

    determine a plurality of heart rates of the patient based on the cardiac electrogram signal;

    identify a first subset of the plurality of heart rates as nighttime heart rates, wherein each of the first subset of the plurality of heart rates occur when the patient is expected or determined to be asleep;

    identify a second subset of the plurality of heart rates as resting heart rates, wherein each of the second subset of the plurality of heart rates occur when the patient is expected or determined to be awake and when at least one of the patient is lying down or an activity level of the patient satisfies a patient inactivity threshold;

    determine a representative nighttime heart rate based on the first subset of the plurality of heart rates;

    determine a representative resting heart rate based on the second subset of the plurality of heart rates;

    determine a nocturnal dip based on the representative nighttime heart rate and the representative resting heart rate;

    compare at least one of the representative nighttime heart rate, the representative resting heart rate, and the nocturnal dip to a respective threshold value; and

    determine whether to generate an alert indicating a change in the cardiac function of the patient based on the comparison.

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