Self-calibrating rate-adaptive pacemaker
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Abstract
A system and method for automatically adjusting the operating parameters of a rate-adaptive cardiac pacemaker. In accordance with the method, maximum exertion levels attained by the patient are measured at periodic intervals and stored. The stored maximum exertion levels may then be used to update a long-term maximal exertion level, and the slope of the rate-response curve is adjusted to map the updated long-term maximal exertion level to a maximum allowable pacing rate. The stored maximum exertion levels may also be used to update a sensor target rate which is used to adjust the slope of the rate response curve.
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Citations
24 Claims
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1-18. -18. (Canceled)
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19. A system for automatically adjusting the responsiveness of a rate-adaptive pacemaker operating in a patient, wherein measured exertion levels in the patient are mapped to a sensor indicated rate by a rate response curve, comprising:
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means for collecting daily maximum exertion levels and daily maximum sensor indicated rates;
means for computing weekly averages of the daily maximum exertion levels and sensor indicated rates;
means for computing a sensor target rate as a function of the weekly average daily maximum exertion level and the patient'"'"'s maximum exercise capacity as defined by a long-term maximum exertion level; and
,means for periodically adjusting the slope of the rate response curve in accordance with the difference between the weekly average maximum sensor indicated rate and the sensor target rate. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification