Dynamic heart rate threshold for neurological event detection
First Claim
1. A method, comprising:
- sensing a time of beat sequence of a patient'"'"'s heart;
processing the time of beat sequence with a medical device to identify a change in heart rate of a patient from a first heart rate to a second heart rate;
determining with the medical device a ratio of the second heart rate to the first heart rate;
continuously updating the first heart rate;
autonomously determining with the medical device a first dynamic ratio threshold for the ratio based on a first patient activity and a second dynamic ratio threshold for the ratio based on a second patient activity;
autonomously determining with the medical device a current dynamic ratio threshold for the ratio which is within a range between the first dynamic ratio threshold and the second dynamic ratio threshold, wherein the current dynamic ratio threshold is based upon a most recently updated window of the first heart rate;
comparing the ratio to the current dynamic ratio threshold; and
detecting a neurologic event based on an occurrence of the ratio exceeding the current dynamic ratio threshold.
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Accused Products
Abstract
A method may include sensing a time of beat sequence of a patient'"'"'s heart and processing said time of beat sequence with a medical device to identify a change in heart rate of a patient from a first heart rate to a second heart rate. The method may continue by determining with the medical device at least one of a) a ratio of the second heart rate to the first heart rate and b) a difference between the second heart rate and the first heart rate. The method may include determining with the medical device at least one of a) a dynamic ratio threshold for the ratio and b) a dynamic difference threshold for the difference, wherein the at least one threshold is based upon the first heart rate. The ratio and/or the difference may be compared to the threshold(s) to detect a neurological event, for example, an epileptic seizure.
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Citations
15 Claims
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1. A method, comprising:
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sensing a time of beat sequence of a patient'"'"'s heart; processing the time of beat sequence with a medical device to identify a change in heart rate of a patient from a first heart rate to a second heart rate; determining with the medical device a ratio of the second heart rate to the first heart rate; continuously updating the first heart rate; autonomously determining with the medical device a first dynamic ratio threshold for the ratio based on a first patient activity and a second dynamic ratio threshold for the ratio based on a second patient activity; autonomously determining with the medical device a current dynamic ratio threshold for the ratio which is within a range between the first dynamic ratio threshold and the second dynamic ratio threshold, wherein the current dynamic ratio threshold is based upon a most recently updated window of the first heart rate; comparing the ratio to the current dynamic ratio threshold; and detecting a neurologic event based on an occurrence of the ratio exceeding the current dynamic ratio threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An article of manufacture comprising a computer-readable non-transitory storage medium having programming configured to cause processing circuitry to perform processing including:
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sensing a time of beat sequence of a patient'"'"'s heart; processing the time of beat sequence with a medical device to identify a change in heart rate of a patient from a first heart rate to a second heart rate; continuously updating the first heart rate; determining with the medical device a ratio of the second heart rate to the first heart rate; autonomously determining with the medical device a first dynamic ratio threshold for the ratio based on a first patient activity and a second dynamic ratio threshold for the ratio based on a second patient activity; autonomously determining with the medical device a current dynamic ratio threshold for the ratio which is within a range between the first dynamic ratio threshold and the second dynamic ratio threshold, wherein the current dynamic ratio threshold is based upon a most recently updated window of the first heart rate; comparing the ratio to the current dynamic ratio threshold; and detecting a neurologic event based on an occurrence of the ratio exceeding the current dynamic ratio threshold. - View Dependent Claims (10, 11, 12)
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13. An apparatus, comprising:
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at least one sensor configured to sense a time of beat sequence of a patient'"'"'s heart; a medical device comprising; a) a heart rate determination module configured to identify from the time of beat sequence a change in heart rate of a patient from a first heart rate to a second heart rate, and continuously update the first heart rate; b) a parameter determination module configured to determine a ratio of the second heart rate to the first heart rate; c) a dynamic threshold determination module configured to autonomously determine a first dynamic ratio threshold for the ratio based on a first patient activity and a second dynamic ratio threshold for the ratio based on a second patient activity, the dynamic threshold determination module configured to autonomously determining with the medical device a current dynamic ratio threshold for the ratio which is within a range between the first dynamic ratio threshold and the second dynamic ratio threshold, wherein the current dynamic ratio threshold is based upon a most recently updated window of the first heart rate; and d) a comparison module configured to compare the ratio to the current dynamic ratio threshold; and e) a neurologic event detection module configured to detect a neurologic event based on an occurrence of the ratio exceeding the current dynamic ratio threshold. - View Dependent Claims (14, 15)
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Specification