Capture verification using an evoked response reference
First Claim
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1. A method of operating a cardiac device to detect capture of a patient'"'"'s heart, comprising:
- delivering one or more non-capturing electrical stimulation pulses to the heart;
sensing one or more pacing artifact waveforms respectively associated with the one or more non-capturing electrical stimulation pulses;
forming one or more pacing artifact templates using the one or more pacing artifact waveforms;
after forming the one or more pacing artifact templates, delivering a subsequent electrical stimulation pulse to the heart;
sensing a cardiac signal following the stimulation pulse;
canceling a particular pacing artifact template of the one or more pacing artifact templates from the sensed cardiac signal to form a pacing artifact template cancelled signal;
comparing the pacing artifact cancelled cardiac signal to an amplitude reference characterizing an amplitude of an evoked response; and
detecting capture of the heart based on comparison of the pacing artifact cancelled cardiac signal and the amplitude reference.
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Abstract
A method and system for verifying capture in the heart involves the use of pacing artifact templates. One or more pacing artifact templates characterizing a post pace artifact signal associated with a particular pace voltage or range of voltages are provided. A pacing artifact template is canceled from a cardiac signal sensed following a pacing pulse. Capture is detected by comparing the pacing artifact canceled cardiac signal to an evoked response reference. Fusion/pseudofusion detection involves determining a correlation between a captured response template and a sensed cardiac signal.
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Citations
19 Claims
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1. A method of operating a cardiac device to detect capture of a patient'"'"'s heart, comprising:
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delivering one or more non-capturing electrical stimulation pulses to the heart; sensing one or more pacing artifact waveforms respectively associated with the one or more non-capturing electrical stimulation pulses; forming one or more pacing artifact templates using the one or more pacing artifact waveforms; after forming the one or more pacing artifact templates, delivering a subsequent electrical stimulation pulse to the heart; sensing a cardiac signal following the stimulation pulse; canceling a particular pacing artifact template of the one or more pacing artifact templates from the sensed cardiac signal to form a pacing artifact template cancelled signal; comparing the pacing artifact cancelled cardiac signal to an amplitude reference characterizing an amplitude of an evoked response; and detecting capture of the heart based on comparison of the pacing artifact cancelled cardiac signal and the amplitude reference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A cardiac therapy device, comprising:
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cardiac electrodes configured to electrically couple to a heart; a pulse generator configured to deliver non-capturing pacing pulses to the heart via the cardiac electrodes; sense circuitry configured to sense cardiac electrical signals following the non-capturing pacing pulses; template circuitry configured to form one or more pacing artifact templates using one or more noncaptured cardiac electrical signals sensed following the non-capturing pacing pulses; a capture detector configured to cancel a particular pacing artifact template of the one or more pacing artifact templates from a cardiac signal sensed following a pacing pulse to form a pacing artifact cancelled cardiac signal, to compare the pacing artifact cancelled cardiac signal to an amplitude reference characterizing an amplitude of an evoked response, and to detect capture of the heart based on comparison of the pacing artifact cancelled cardiac signal and the amplitude reference. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A cardiac therapy device, comprising:
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cardiac electrodes configured to electrically couple to a heart; a pulse generator configured to deliver non-capturing pacing pulses to the heart via the cardiac electrodes; sense circuitry configured to sense cardiac electrical signals following the non-capturing pacing pulses; means for forming one or more pacing artifact templates using the sensed cardiac signals; and means for canceling a particular pacing artifact template of the one or more pacing artifact templates from a cardiac signal sensed following a pacing pulse to form a pacing artifact cancelled cardiac signal, comparing the pacing artifact cancelled cardiac signal to an amplitude reference characterizing an amplitude of an evoked response, and detecting capture of the heart based on comparison of the pacing artifact cancelled cardiac signal and the amplitude reference. - View Dependent Claims (19)
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Specification