Method and apparatus for enhancing treatable arrhythmia detection specificity by using accumulated patient activity
First Claim
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1. A method for detecting a cardiac event in a patient, comprising:
- determining an activity level count from an activity sensor signal for each of a plurality of time segments;
storing an activity level count for each of the plurality of time segments in a histogram;
accumulating the stored activity level counts to determine a percentage of time segments having an activity level count above a given activity level count;
establishing an activity level count threshold in response to the accumulated activity level counts;
sensing a cardiac signal from a plurality of electrodes for each of the plurality of time segments;
classifying the cardiac signal for each of the plurality of time segments as one of a treatable segment and a non-treatable segment;
comparing a stored activity level for a given one of the plurality of time segments to the activity level count threshold in response to classifying a treatable segment;
reclassifying the treatable segment as a non-treatable segment if the stored activity level for the given one of the plurality of time segments is greater than the activity level count threshold; and
detecting the cardiac event in response to a treatable segment not being reclassified.
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Abstract
A method and apparatus for detecting a cardiac event in a medical device determine an activity level count from an activity sensor signal for each of a number of time segments, store an activity level count for each of the time segments in a histogram, and accumulate the stored activity level counts to determine a percentage of time segments having an activity level count above a given activity level count.
27 Citations
23 Claims
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1. A method for detecting a cardiac event in a patient, comprising:
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determining an activity level count from an activity sensor signal for each of a plurality of time segments; storing an activity level count for each of the plurality of time segments in a histogram; accumulating the stored activity level counts to determine a percentage of time segments having an activity level count above a given activity level count; establishing an activity level count threshold in response to the accumulated activity level counts; sensing a cardiac signal from a plurality of electrodes for each of the plurality of time segments; classifying the cardiac signal for each of the plurality of time segments as one of a treatable segment and a non-treatable segment; comparing a stored activity level for a given one of the plurality of time segments to the activity level count threshold in response to classifying a treatable segment; reclassifying the treatable segment as a non-treatable segment if the stored activity level for the given one of the plurality of time segments is greater than the activity level count threshold; and detecting the cardiac event in response to a treatable segment not being reclassified. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A medical device for detecting cardiac events, comprising:
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an activity sensor to sense a signal correlated to a level of patient activity; a plurality of electrodes to sense cardiac electrical signals; and a controller configured to; determine an activity level count from the activity sensor signal for each of a plurality of time segments; store an activity level count for each of the plurality of time segments in a histogram; accumulate the stored activity level counts to determine a percentage of time segments having an activity level count above a given activity level count; establish an activity level count threshold in response to the accumulated activity level counts; classify the cardiac signal for each of the plurality of time segments as one of a treatable segment and a non-treatable segment; compare a stored activity level for a given one of the plurality of time segments to the activity level count threshold in response to classifying a treatable segment; and reclassify the treatable segment as a non-treatable segment if the stored activity level for the given one of the plurality of time segments is greater than the activity level count threshold. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A non-transient computer-readable medium storing a set of instructions that cause a medical device processor to:
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determine an activity level count from an activity sensor signal for each of a plurality of time segments; store an activity level count for each of the plurality of time segments in a histogram; accumulate the stored activity level counts to determine a percentage of time segments having an activity level count above a given activity level count; establish an activity level count threshold in response to the accumulated activity level counts; sense a cardiac signal from a plurality of electrodes for each of the plurality of time segments; classify the cardiac signal for each of the plurality of time segments as one of a treatable segment and a non-treatable segment; compare a stored activity level for a given one of the plurality of time segments to the activity level count threshold in response to classifying a treatable segment; reclassify the treatable segment as a non-treatable segment if the stored activity level for the given one of the plurality of time segments is greater than the activity level count threshold; and detect the cardiac event in response to a treatable segment not being reclassified.
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Specification