Implantable medical device responsive to heart rate variability analysis
First Claim
1. A method, comprising:
- receiving heart beat signal;
analyzing the heart beat signals for an abnormal cardiac rhythm;
detecting the abnormal cardiac rhythm from the heart beat signals;
determining a variability in the heart beat signals that preceded the abnormal cardiac rhythm; and
classifying the variability in the heart beat signals that preceded the abnormal cardiac rhythm to a heart rate variability zone.
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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.
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Citations
28 Claims
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1. A method, comprising:
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receiving heart beat signal;
analyzing the heart beat signals for an abnormal cardiac rhythm;
detecting the abnormal cardiac rhythm from the heart beat signals;
determining a variability in the heart beat signals that preceded the abnormal cardiac rhythm; and
classifying the variability in the heart beat signals that preceded the abnormal cardiac rhythm to a heart rate variability zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method implemented by a processor of an implantable medical device, the method comprising:
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receiving heart beat signals for a first period;
determining a first period heart rate variability for the first period;
receiving heart beat signals for a second period subsequent to the first period;
detecting an abnormal heart beat signal within the second period;
determining a second period heart rate variability during the second period; and
classifying the second period heart rate variability. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method implemented by a processor of an implantable medical device, the method comprising:
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receiving heart beat signals for a first period and a second period, the second period subsequent to the first period;
determining a first period heart rate variability parameter for the first period and a second heart rate variability parameter during the second period;
detecting an abnormal heart beat signal within the second period;
classifying the first period heart rate variability parameter within a first zone of a plurality of heart rate variability zones, each zone of the plurality of heart rate variability zones having two or more dimensions;
classifying the second period heart rate variability parameter within a second zone of the plurality of heart rate variability zones, the second zone remote from the first zone; and
redefining the first zone to include a region encompassing the second period heart rate variability parameter. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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Specification