Capture detection for multi-chamber pacing
First Claim
1. A method, comprising:
- delivering a pacing pulse to a left heart chamber during a cardiac cycle;
delivering a pacing pulse to a right heart chamber during the cardiac cycle;
sensing a cardiac electrogram signal using a first electrode following the pacing pulses;
distinguishing between at least two of left chamber capture only, right chamber capture only, and bi-chamber capture based on characteristics of the cardiac electrogram signal;
sensing an additional cardiac electrogram signal using a second electrode; and
confirming left chamber capture only, right chamber capture only, or bi-chamber capture based on characteristics of the additional cardiac electrogram signal.
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Abstract
Multi-chamber pacing may result in capture of one chamber, capture of multiple chambers, fusion, or non-capture. Approaches for detecting various capture conditions during multi-chamber pacing are described. Pacing pulses are delivered to left and right heart chambers during a cardiac cycle. A cardiac electrogram signal is sensed following the delivery of the pacing pulses. Left chamber capture only, right chamber capture only, and bi-chamber capture may be distinguished based on characteristics of the cardiac electrogram signal. Multi-chamber capture detection may be implemented using detection windows having dimensions of time and amplitude. The detection windows are associated with expected features, such as expected signal peaks, under a particular capture condition. The cardiac electrogram signal features are compared to detection windows to determine the capture condition.
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Citations
23 Claims
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1. A method, comprising:
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delivering a pacing pulse to a left heart chamber during a cardiac cycle; delivering a pacing pulse to a right heart chamber during the cardiac cycle; sensing a cardiac electrogram signal using a first electrode following the pacing pulses; distinguishing between at least two of left chamber capture only, right chamber capture only, and bi-chamber capture based on characteristics of the cardiac electrogram signal; sensing an additional cardiac electrogram signal using a second electrode; and confirming left chamber capture only, right chamber capture only, or bi-chamber capture based on characteristics of the additional cardiac electrogram signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A cardiac device, comprising:
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sensing circuitry comprising cardiac electrodes and configured to sense a cardiac electrogram signal following delivery of pacing pulses delivered to left and right heart chambers, respectively, during a cardiac cycle; and a processor coupled to the sensing circuitry, the processor configured to distinguish between at least two of left chamber capture only, right chamber capture only, and bi-chamber capture based on characteristics of the cardiac electrogram signal; wherein the sensing circuitry is configured to sense an additional cardiac electrogram signal; and wherein the processor is configured to confirm left chamber capture only, right chamber capture only, or bi-chamber capture based on characteristics of the additional cardiac electrogram signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A cardiac response detection system, comprising:
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a pulse generator configured to deliver pacing pulses to left and right heart chambers, respectively, during a cardiac cycle; means for sensing a cardiac electrogram signal following the pacing pulses; means for sensing an additional cardiac electro gram signal; means for distinguishing between at least two of multi-chamber capture, left chamber capture only, and right chamber capture only based on characteristics of the cardiac electrogram signal; and means for confirming multi-chamber capture, left chamber capture only, or right chamber capture only, based on characteristics of the additional cardiac electrogram signal. - View Dependent Claims (22, 23)
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Specification