Artifact cancellation to suppress far-field activation during electrophysiology mapping
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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Abstract
A method for mapping a cardiac chamber includes 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, isolating R-wave events in the activation signals, generating a far-field activation template representative of the far-field activation signal component based on the R-wave events, and filtering the far-field activation template from the activation signals to identify the near-field activation signal components in the activation signals.
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Citations
16 Claims
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1. A method for mapping a cardiac chamber, the method comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for reconstructing electrical activity propagation along an electrode array within a cardiac chamber, the method comprising:
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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; 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; 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 mapping the identified near-field activation signal components. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A catheter system comprising:
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a catheter; a plurality of mapping electrodes disposed on the catheter and configured to sense activation signals of intrinsic physiological activity disposed in or near the cardiac chamber, the activation signals including a near-field activation signal component and a far-field activation signal component; and a signal processing system associated with the plurality of mapping electrodes, the signal processing system configured to isolate far-field events in the activations, segment the activation signals sensed by each electrode and average the isolated far-field events in the segmented activation signals from each electrode to generate a far-field activation template representative of the far-field activation signal component, the processing system further configured to subtract 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, to compare amplitudes among a set of consecutive far-field segmented activation signals corresponding to an electrode of the plurality of electrodes, to determine that the consecutive far-field segmented activation signals have inconsistent amplitudes, to blank the electrode in the plurality of electrodes based on determining that the consecutive far-field segmented activation signals have inconsistent amplitudes, and to map the identified near-field activation signal component. - View Dependent Claims (16)
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Specification