Implantable medical device responsive to heart rate variability analysis
First Claim
1. A medical device, comprising:
- an electrode for detecting a series of heart beat signals from the heart of a patient;
means for providing a therapy regime to a heart of a patient;
memory having stored therein at least one heart rate variability zone with a corresponding therapy regime; and
control circuitry in electrical communication with said electrode, said control circuitry havingmeans for receiving said series of heart beat signals and for computing a measurement of heart rate variability,means for comparing said measurement of heart rate variability to said heart rate variability zone,means for initiating said therapy regime if said heart rate variability zone includes said measurement of heart rate variability,means for modifying said heart rate variability zone if said heart rate variability zone does not include said measurement of heart rate variability and said control circuitry detects a cardiac anomaly, andmeans for storing said modified heart rate variability zone in said memory.
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Accused Products
Abstract
A method and apparatus for evaluating heart rate variability of the heart of a person in order to forecast a cardiac event. A cardiac stimulator receives heart beat signals from the heart and determines a measurement of heart rate variability based on statistical data derived from the heart beat signals and sensing data derived from a sensor. This measurement of heart rate variability is compared with previously stored heart rate variability zones defining normal and abnormal heart rate variability. These zones are modifiable after the occurrence of a cardiac event. Once a cardiac event is detected, a pathway is computed which extends from a generally normal heart rate variability condition to an abnormal heart rate variability condition. Subsequent measurements of heart rate variability are compared with this pathway. Selective therapy regimes are initiated depending on the measurement of heart rate variability.
340 Citations
5 Claims
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1. A medical device, comprising:
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an electrode for detecting a series of heart beat signals from the heart of a patient; means for providing a therapy regime to a heart of a patient; memory having stored therein at least one heart rate variability zone with a corresponding therapy regime; and control circuitry in electrical communication with said electrode, said control circuitry having means for receiving said series of heart beat signals and for computing a measurement of heart rate variability, means for comparing said measurement of heart rate variability to said heart rate variability zone, means for initiating said therapy regime if said heart rate variability zone includes said measurement of heart rate variability, means for modifying said heart rate variability zone if said heart rate variability zone does not include said measurement of heart rate variability and said control circuitry detects a cardiac anomaly, and means for storing said modified heart rate variability zone in said memory. - View Dependent Claims (2, 3, 4, 5)
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Specification