System and method for identifying and responding to P-wave oversensing in a cardiac system
First Claim
1. An implantable cardioverter defibrillator (ICD) system, comprising:
- a sensing circuit configured to;
receive a cardiac electrical signal from electrodes coupled to the ICD, andsense a plurality of consecutive cardiac events from the cardiac electrical signal, each one of the plurality of consecutive cardiac events being sensed as an R-wave in response to the cardiac electrical signal crossing an R-wave sensing threshold;
a therapy delivery circuit configured to deliver electrical stimulation therapy to a patient'"'"'s heart via electrodes coupled to the ICD; and
a control circuit configured to;
determine at least one sensed event parameter from the cardiac electrical signal for each one of the plurality of consecutive cardiac events sensed as an R-wave by the sensing circuit;
compare the sensed event parameters to P-wave oversensing criteria;
detect P-wave oversensing in response to the sensed event parameters meeting the P-wave oversensing criteria, the P-wave oversensing corresponding to at least one P-wave being falsely sensed as at least one of the plurality of consecutive cardiac events that is sensed as an R-wave by the sensing circuit; and
adjust at least one of an R-wave sensing control parameter or a therapy delivery control parameter in response to detecting the P-wave oversensing.
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Accused Products
Abstract
A cardiac medical system, such as an implantable cardioverter defibrillator (ICD) system, receives a cardiac electrical signal by and senses cardiac events when the signal crosses an R-wave sensing threshold. The system determines at least one sensed event parameter from the cardiac electrical signal for consecutive cardiac events sensed by the sensing circuit and compares the sensed event parameters to P-wave oversensing criteria. The system detects P-wave oversensing in response to the sensed event parameters meeting the P-wave oversensing criteria; and adjusts at least one of an R-wave sensing control parameter or a therapy delivery control parameter in response to detecting the P-wave oversensing.
39 Citations
32 Claims
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1. An implantable cardioverter defibrillator (ICD) system, comprising:
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a sensing circuit configured to; receive a cardiac electrical signal from electrodes coupled to the ICD, and sense a plurality of consecutive cardiac events from the cardiac electrical signal, each one of the plurality of consecutive cardiac events being sensed as an R-wave in response to the cardiac electrical signal crossing an R-wave sensing threshold; a therapy delivery circuit configured to deliver electrical stimulation therapy to a patient'"'"'s heart via electrodes coupled to the ICD; and a control circuit configured to; determine at least one sensed event parameter from the cardiac electrical signal for each one of the plurality of consecutive cardiac events sensed as an R-wave by the sensing circuit; compare the sensed event parameters to P-wave oversensing criteria; detect P-wave oversensing in response to the sensed event parameters meeting the P-wave oversensing criteria, the P-wave oversensing corresponding to at least one P-wave being falsely sensed as at least one of the plurality of consecutive cardiac events that is sensed as an R-wave by the sensing circuit; and adjust at least one of an R-wave sensing control parameter or a therapy delivery control parameter in response to detecting the P-wave oversensing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method comprising:
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receiving a cardiac electrical signal; sensing a plurality of consecutive cardiac events from the cardiac electrical signal, each one of the plurality of consecutive cardiac events being sensed as an R-wave in response to the cardiac electrical signal crossing an R-wave sensing threshold; determining at least one sensed event parameter from the cardiac electrical signal for each one of the plurality of consecutive sensed cardiac events; comparing the sensed event parameters to P-wave oversensing criteria; detecting P-wave oversensing in response to the sensed event parameters meeting the P-wave oversensing criteria, the P-wave oversensing corresponding to at least one P-wave being falsely sensed as at least one of the plurality of consecutive cardiac events that is sensed as an R-wave by the sensing circuit; and adjusting at least one of an R-wave sensing control parameter or a therapy delivery control parameter in response to detecting the P-wave oversensing. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30, 31)
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28. The method of 17, further comprising:
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determining a peak amplitude from the cardiac electrical signal for each of the plurality of consecutive cardiac events; determining a morphology matching score for each of the plurality of consecutive cardiac events by comparing the cardiac electrical signal to a pre-determined R-wave template; determining a first pattern of the peak amplitudes determined for the consecutive cardiac events by labeling each of the peak amplitudes as one of high or low based on a comparison of the peak amplitudes to an amplitude threshold; determining a second pattern of the morphology matching scores determined for the consecutive cardiac events by labeling each of the morphology matching scores as one of match or non-match based on a comparison of the morphology matching scores to an R-wave matching threshold; determining a third pattern of the event time intervals determined for the consecutive cardiac events by labeling each of the event time intervals as one of short or long based on a comparison of the event time intervals to the event interval threshold; and detecting the cluster of sensed events based on at least two of the first pattern, the second pattern and the third pattern being an alternating pattern.
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32. A non-transitory, computer-readable storage medium comprising a set of instructions which, when executed by a control circuit of a medical system, cause the system to:
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receive a cardiac electrical signal by a sensing circuit via electrodes coupled to the medical system; sense a plurality of consecutive cardiac events from the cardiac electrical signal, each one of the plurality of consecutive cardiac events being sensed as an R-wave in response to the cardiac electrical signal crossing an R-wave sensing threshold; determine by a control circuit of the medical system at least one sensed event parameter from the cardiac electrical signal for each one of the plurality of consecutive cardiac events sensed as an R-wave by the sensing circuit; compare the sensed event parameters to P-wave oversensing criteria; detect P-wave oversensing in response to the sensed event parameters meeting the P-wave oversensing criteria, the P-wave oversensing corresponding to at least one P-wave being falsely sensed as at least one of the plurality of consecutive cardiac events that is sensed as an R-wave by the sensing circuit; and adjust at least one of an R-wave sensing control parameter or a therapy delivery control parameter in response to detecting the P-wave oversensing.
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Specification