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Activity sensor processing for phrenic nerve activation detection

  • US 9,403,018 B2
  • Filed: 03/23/2015
  • Issued: 08/02/2016
  • Est. Priority Date: 05/27/2009
  • Status: Active Grant
First Claim
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1. An implantable medical device, comprising:

  • a pulse generator configured to deliver cardiac pacing to a heart;

    an accelerometer configured to generate an acceleration signal at an accelerometer output terminal;

    a first filter channel configured to attenuate first frequencies of the acceleration signal to produce a first physiological signal, wherein the first physiological signal provides a measure of a patient'"'"'s respiration;

    a second filter channel, separate from the first filter channel, the second filter channel configured to attenuate second frequencies of the acceleration signal to produce a second physiological signal indicative of phrenic nerve activation; and

    circuitry configured to;

    determine one or more characteristics of a patient'"'"'s state based at least in part on the first physiological signal, identify a phase of respiration of the patient using the first physiological signal, to detect phrenic nerve activation in a time relation to the phase of respiration caused by cardiac pacing during the phase of respiration based at least in part on the second physiological signal, and to adjust a value of at least parameter of the cardiac pacing based on detected phrenic nerve activation.

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