Method and System for Detecting Capture with Cancellation of Pacing Artifact
First Claim
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1. A method for operating a medical device, comprising:
- delivering non-capturing electrical stimulation pulses to a heart at a plurality of pulse amplitudes;
sensing pacing artifact waveforms associated with each pulse amplitude of the plurality of pulse amplitudes;
forming pacing artifact templates associated with the plurality of pulse amplitudes;
delivering a subsequent electrical stimulation pulse to the heart;
sensing a cardiac signal following the subsequent electrical stimulation pulse;
canceling a pacing artifact template of the plurality of pacing artifact templates from the sensed cardiac signal to form a pacing artifact template canceled signal; and
detecting capture of the heart using the pacing artifact template canceled signal.
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Abstract
Methods and systems for detecting capture using pacing artifact cancellation are described. One or more pacing artifact templates are provided and a cardiac signal is sensed in a cardiac verification window. Each of the pacing artifact templates may characterize the pacing artifact associated with a particular pacing energy level, for example. A particular pacing artifact template is canceled from the cardiac signal. Capture is determined using the pacing artifact canceled cardiac signal. Detection of fusion/pseudofusion beats may be accomplished by comparing a cardiac signal to a captured response template.
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Citations
20 Claims
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1. A method for operating a medical device, comprising:
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delivering non-capturing electrical stimulation pulses to a heart at a plurality of pulse amplitudes; sensing pacing artifact waveforms associated with each pulse amplitude of the plurality of pulse amplitudes; forming pacing artifact templates associated with the plurality of pulse amplitudes; delivering a subsequent electrical stimulation pulse to the heart; sensing a cardiac signal following the subsequent electrical stimulation pulse; canceling a pacing artifact template of the plurality of pacing artifact templates from the sensed cardiac signal to form a pacing artifact template canceled signal; and detecting capture of the heart using the pacing artifact template canceled signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A medical device, comprising:
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electrodes configured to electrically couple to a heart; pulse generator circuitry coupled to the electrodes and configured to provide stimulation pulses to the heart at a plurality of pulse amplitudes; sensing circuitry configured to sense cardiac electrical signals following the stimulation pulses; template circuitry configured to form pacing artifact templates associated with the plurality of pulse amplitudes; and a capture detector configured to cancel a pacing artifact template of the plurality of pacing artifact templates from a cardiac signal sensed following a stimulation pulse and to detect capture of the heart using the pacing artifact cancelled cardiac signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A medical device, comprising:
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electrodes configured to electrically couple to the heart; pulse generator circuitry coupled to the electrodes and configured to provide stimulation pulses at a plurality of pulse amplitudes to the heart via the electrodes; sensing circuitry configured to sense cardiac electrical signals following the stimulation pulses; means for forming pacing artifact templates associated with the plurality of pulse amplitudes; means for canceling a pacing artifact template of the plurality of pacing artifact templates from a cardiac signal sensed following a stimulation pulse and detecting capture of the heart using the pacing artifact cancelled cardiac signal.
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Specification