Identifying lead problems using amplitudes of far-field cardiac events
First Claim
1. A method comprising:
- obtaining a near-field (NF) cardiac electrical signal sensed via a NF sensing vector between a first pair of electrodes located within a first chamber of a heart;
obtaining a far-field (FF) cardiac electrical signal sensed via a FF sensing vector between a second pair of electrodes, wherein at least one of the second pair of electrodes is located outside the first heart chamber of the heart;
detecting a NF cardiac event in the NF cardiac electrical signal;
determining an amplitude of a FF cardiac event in the FF cardiac electrical signal coincident the detected NF cardiac event;
comparing the amplitude of the coincident FF cardiac event to a threshold amplitude; and
detecting a short circuit condition on the FF sensing vector when the amplitude of the coincident FF cardiac event is less than the threshold amplitude.
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Abstract
An implantable medical device capable of sensing cardiac signals and delivering cardiac electrical stimulation therapies is enabled to detect a short circuit condition on a sensing or therapy vector. A cardiac signal is sensed by a sensing module coupled to electrodes. A control module detects a short circuit condition in response to a significant drop in amplitude of far-field cardiac events coincident to near-field cardiac events. In some instances, the short circuit condition is detected in response an abnormal impedance on the far-field sensing vector and/or a matching morphology of the far-field cardiac electrical signal including the coincident FF cardiac event in addition to the significant drop in amplitude of the coincident FF cardiac events.
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Citations
21 Claims
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1. A method comprising:
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obtaining a near-field (NF) cardiac electrical signal sensed via a NF sensing vector between a first pair of electrodes located within a first chamber of a heart; obtaining a far-field (FF) cardiac electrical signal sensed via a FF sensing vector between a second pair of electrodes, wherein at least one of the second pair of electrodes is located outside the first heart chamber of the heart; detecting a NF cardiac event in the NF cardiac electrical signal; determining an amplitude of a FF cardiac event in the FF cardiac electrical signal coincident the detected NF cardiac event; comparing the amplitude of the coincident FF cardiac event to a threshold amplitude; and detecting a short circuit condition on the FF sensing vector when the amplitude of the coincident FF cardiac event is less than the threshold amplitude. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An implantable medical system comprising:
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at least one medical electrical lead including; a plurality of electrodes carried by the at least one medical electrical lead; and a plurality of electrical conductors, each of the plurality of electrical conductors electrically connected to a respective one of the plurality of electrodes; an implantable medical device electrically coupled to the at least one medical electrical lead, the implantable medical device including; a housing at least partially formed of a conductive material, the conductive material forming a housing electrode; a sensing module electrically coupled to a near field (NF) sensing vector between a first pair of electrodes of the plurality of electrodes carried by the lead and located within a first chamber of a heart to obtain a NF cardiac electrical signal and electrically coupled to a far-field (FF) sensing vector between a second pair of electrodes, at least one of the second pair of electrodes being located outside the first heart chamber of the heart, to obtain a FF cardiac electrical signal; a control module electrically coupled to the sensing module, wherein the control module detects a NF cardiac event in the NF cardiac electrical signal, determines an amplitude of a FF cardiac event in the FF cardiac electrical signal coincident the detected NF cardiac event, compares the amplitude of the coincident FF cardiac event to a threshold amplitude, and detects a short circuit condition on the FF sensing vector when the amplitude of the coincident FF cardiac event is less than the threshold amplitude. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification