Implantable medical device responsive to heart rate variability analysis
First Claim
1. A method, comprising:
- defining an abnormal heart rate variability zone;
receiving a first series of heart beat signals during a first time period, where the first time period has a first predetermined length of time;
computing said heart beat signals into a first measurement of heart rate variability;
comparing said first measurement of heart rate variability with said abnormal heart rate variability zone; and
modifying said abnormal heart rate variability zone to include said first measurement of heart rate variability if a cardiac anomaly is detected during said first time period.
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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.
249 Citations
7 Claims
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1. A method, comprising:
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defining an abnormal heart rate variability zone; receiving a first series of heart beat signals during a first time period, where the first time period has a first predetermined length of time; computing said heart beat signals into a first measurement of heart rate variability; comparing said first measurement of heart rate variability with said abnormal heart rate variability zone; and modifying said abnormal heart rate variability zone to include said first measurement of heart rate variability if a cardiac anomaly is detected during said first time period. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification