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Systems and methods for managing noise in implantable medical devices

  • US 9,345,890 B2
  • Filed: 06/15/2010
  • Issued: 05/24/2016
  • Est. Priority Date: 06/15/2009
  • Status: Active Grant
First Claim
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1. A method for processing atrial electrical signals obtained from a patient comprising:

  • gathering a first set of atrial electrical signals within the patient using an implantable medical device during an atrial pacing threshold test, the first set of electrical signals comprising a set of samples of electrical activity from a discrete sample time window spanning a pacing event, wherein the sample time window starts in response to an electrical stimulation p acing pulse;

    filtering the first set of atrial signals to provide a second set of electrical signals, the second set of electrical signals comprising frequencies above a cutoff frequency;

    estimating the amount of noise present in the first set of atrial electrical signals based on the magnitude of the second set of electrical signals;

    calculating a noise threshold value according to a capture detection threshold;

    discarding the first set of atrial electrical signals if the estimated amount of noise exceeds the noise threshold value;

    calculating an updated noise adjusted pace artifact threshold based on the estimated amount of noise if the noise does not exceed the noise threshold value;

    comparing the updated noise adjusted pace artifact threshold to the noise threshold value; and

    when the updated noise adjusted pace artifact threshold is less than the noise threshold value, classifying the electrical signal as loss of capture or fusion.

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