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Artifact cancellation to suppress far-field activation during electrophysiology mapping

  • US 9,439,578 B2
  • Filed: 12/20/2013
  • Issued: 09/13/2016
  • Est. Priority Date: 12/27/2012
  • Status: Active Grant
First Claim
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1. A method for mapping a cardiac chamber, the method comprising:

  • sensing activation signals of intrinsic physiological activity with a plurality of electrodes disposed in or near the cardiac chamber, the activation signals including a near-field activation signal component and a far-field activation signal component, wherein the plurality of electrodes are disposed on a catheter;

    isolating far-field events in the activation signals;

    segmenting the activation signals sensed by each electrode;

    generating a far-field activation template representative of the far-field activation signal component by averaging the far-field events in the segmented activation signals from each electrode;

    comparing amplitudes among a set of consecutive far-field segmented activation signals corresponding to an electrode of the plurality of electrodes;

    determining that the consecutive far-field segmented activation signals have inconsistent amplitudes;

    blanking the electrode in the plurality of electrodes based on determining that the consecutive far-field segmented activation signals have inconsistent amplitudes; and

    subtracting the far-field activation template from the activation signals at the isolated far-field events to identify the near-field activation signal components in the activation signals.

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