Retrograde atrial sensing for identifying sub-threshold atrial pacing
First Claim
1. A method of detecting sub-threshold atrial pacing, comprising:
- delivering a pacing pulse to an atrium during a cardiac cycle;
identifying a retrograde P-wave during the cardiac cycle, the retrograde P-wave indicative of sub-threshold atrial pacing; and
adjusting delivery of the pacing pulse to the atrium in a subsequent cardiac cycle in response to identifying the retrograde P-wave.
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Accused Products
Abstract
Methods and systems for delivering a pacing pulse to an atrium during a cardiac cycle. A retrograde P-wave may be identified during the cardiac cycle, indicative of sub-threshold atrial pacing. Delivery of the pacing pulse to the atrium may be adjusted in a subsequent cardiac cycle in response to identifying the retrograde P-wave. Adjusting delivery of the pacing pulse may involve initiating an atrial capture threshold test, temporarily increasing one or both of the pacing pulse amplitude and pulse width, and/or re-evaluating one or both of the pacing pulse amplitude and pulse width. Adjusting delivery of the pacing pulse may also involve altering the timing of a scheduled atrial capture threshold test. During an atrial capture threshold test, a retrograde P-wave template may be generated in response to atrial non-capture sensed during the atrial capture threshold test, and used to identify subsequent retrograde P-waves.
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Citations
20 Claims
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1. A method of detecting sub-threshold atrial pacing, comprising:
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delivering a pacing pulse to an atrium during a cardiac cycle;
identifying a retrograde P-wave during the cardiac cycle, the retrograde P-wave indicative of sub-threshold atrial pacing; and
adjusting delivery of the pacing pulse to the atrium in a subsequent cardiac cycle in response to identifying the retrograde P-wave. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A cardiac system, comprising:
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a plurality of implantable electrodes configured for one or both of sensing a cardiac signal and delivering cardiac pacing pulses to a patient;
a housing configured for implantation in the patient; and
a controller provided in the housing and coupled to the plurality of implantable electrodes, wherein the controller is configured to deliver a pacing pulse to an atrium of the patient'"'"'s heart during a cardiac cycle, identify a retrograde P-wave indicative of sub-threshold atrial pacing during the cardiac cycle, and adjust delivery of the pacing pulse to the atrium in a subsequent cardiac cycle in response to identifying the retrograde P-wave. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A cardiac system, comprising:
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means for delivering a pacing pulse to an atrium during a cardiac cycle;
means for identifying a retrograde P-wave during the cardiac cycle, the retrograde P-wave indicative of sub-threshold atrial pacing; and
means for adjusting delivery of the pacing pulse to the atrium in a subsequent cardiac cycle in response to identifying the retrograde P-wave. - View Dependent Claims (20)
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Specification