Method and system for detecting capture with cancellation of pacing artifact
First Claim
Patent Images
1. A method for determining a cardiac response of a patient'"'"'s heart to a pacing pulse in a cardiac beat, comprising:
- delivering the pacing pulse to the patient'"'"'s heart;
sensing a cardiac signal following the pacing pulse;
canceling a pacing artifact template from the cardiac signal to form a pacing artifact canceled cardiac signal;
detecting whether capture occurred by analyzing the pacing artifact canceled cardiac signal during a first time window following the pacing pulse;
canceling a captured response template from the cardiac signal to form a captured response canceled cardiac signal; and
detecting whether fusion/pseudofusion occurred by analyzing the captured response canceled cardiac signal during a second time window following the pacing pulse.
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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.
38 Citations
14 Claims
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1. A method for determining a cardiac response of a patient'"'"'s heart to a pacing pulse in a cardiac beat, comprising:
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delivering the pacing pulse to the patient'"'"'s heart; sensing a cardiac signal following the pacing pulse; canceling a pacing artifact template from the cardiac signal to form a pacing artifact canceled cardiac signal; detecting whether capture occurred by analyzing the pacing artifact canceled cardiac signal during a first time window following the pacing pulse; canceling a captured response template from the cardiac signal to form a captured response canceled cardiac signal; and detecting whether fusion/pseudofusion occurred by analyzing the captured response canceled cardiac signal during a second time window following the pacing pulse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A medical device for use with a patient'"'"'s heart, comprising:
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electrodes electrically couplable to the heart; pulse generator circuitry coupled to the electrodes and configured to provide stimulation pulses to the heart; sensing circuitry coupled to the electrodes and configured to sense a cardiac signal after a given one of the stimulation pulses; and a capture detection system configured to provide a pacing artifact template and a captured response template, to cancel the pacing artifact template from the sensed cardiac signal, to cancel the captured response template from the sensed cardiac signal, to detect whether capture occurred by analyzing the pacing artifact canceled cardiac signal during a first time window following the given pacing pulse, and to detect whether fusion/pseudofusion occurred by analyzing the captured response canceled cardiac signal during a second time window following the given pacing pulse. - View Dependent Claims (10, 11, 12)
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13. A system for determining a cardiac response of a patient'"'"'s heart to a pacing pulse in a cardiac beat, comprising:
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a pulse delivery system configured to deliver the pacing pulse to the patient'"'"'s heart; a sensing system configured to sense a cardiac signal following the pacing pulse; means for canceling a pacing artifact template from the cardiac signal to form a pacing artifact canceled cardiac signal; means for detecting whether capture occurred by analyzing the pacing artifact canceled cardiac signal during a first time window following the pacing pulse; means for canceling a captured response template from the cardiac signal to form a captured response canceled cardiac signal; and means for detecting whether fusion/pseudofusion occurred by analyzing the captured response canceled cardiac signal during a second time window following the pacing pulse. - View Dependent Claims (14)
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Specification