Use of detection profiles in an implantable medical device
First Claim
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1. A method of operation in an implantable cardiac system comprising a plurality of electrodes coupled to operational circuitry configured to analyze cardiac signals, the method comprising:
- the operational circuitry detecting a first cardiac event by comparing a cardiac signal received from the electrodes to a detection threshold, the detection threshold being defined by a detection profile chosen from at least first and second detection profiles, with the second detection profile having lesser sensitivity to cardiac signals than the first detection profile;
the operational circuitry detecting a close call after the first cardiac event, in which the close call is detected by applying a set of close call rules including a first rule in which;
the operational circuitry defines a detection threshold to apply after the first cardiac event is detected;
the operational circuitry defines a close call threshold below the detection threshold; and
the operational circuitry determines that the close call threshold has been crossed without the detection threshold being crossed; and
the operational circuitry determining that a close call has occurred in response to the set of close call rules being met, including finding that at least the first rule has been met, and, in response to determining that a close call has occurred, selects the second detection profile for use in detecting at least one cardiac event.
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Abstract
Implantable medical device systems and methods configured to use a detection profile selected from among a plurality of detection profiles to define a detection threshold for identifying cardiac events, in which a close call definition is used to determine which of the plurality of detection profiles is to be chosen. Upon identifying a close call, in which an overdetection nearly occurred but did not actually take place, a relatively less sensitive detection profile is chosen.
261 Citations
15 Claims
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1. A method of operation in an implantable cardiac system comprising a plurality of electrodes coupled to operational circuitry configured to analyze cardiac signals, the method comprising:
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the operational circuitry detecting a first cardiac event by comparing a cardiac signal received from the electrodes to a detection threshold, the detection threshold being defined by a detection profile chosen from at least first and second detection profiles, with the second detection profile having lesser sensitivity to cardiac signals than the first detection profile; the operational circuitry detecting a close call after the first cardiac event, in which the close call is detected by applying a set of close call rules including a first rule in which; the operational circuitry defines a detection threshold to apply after the first cardiac event is detected; the operational circuitry defines a close call threshold below the detection threshold; and the operational circuitry determines that the close call threshold has been crossed without the detection threshold being crossed; and the operational circuitry determining that a close call has occurred in response to the set of close call rules being met, including finding that at least the first rule has been met, and, in response to determining that a close call has occurred, selects the second detection profile for use in detecting at least one cardiac event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An implantable cardiac system comprising a plurality of electrodes coupled to operational circuitry configured to analyze cardiac signals, wherein:
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the operational circuitry is configured to detect to cardiac events by the application of a detection threshold to a cardiac signal received from the electrodes, the detection threshold being defined by a detection profile selected from at least first and second detection profiles, with the second detection profile having lesser sensitivity to cardiac signals than the first detection profile; the operational circuitry is configured to detect a first cardiac event and determine whether a close call has occurred by applying close call rules; the operational circuitry is configured such that the close call rules comprise a first rule relying on a close call threshold defined relative to the detection threshold such that the first rule is met if the cardiac signal following the first cardiac event crosses the close call threshold without crossing the detection threshold; and the operational circuitry is configured to select the second detection profile for use in detecting at least one cardiac event after the first cardiac event if it determines that a close call has occurred in which at least the first rule has been met. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification