Self-calibrating rate-adaptive pacemaker
First Claim
1. 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:
- 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.
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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.
66 Citations
24 Claims
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1. 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 (2, 3, 4, 5, 6)
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7. A method 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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collecting short-term maximum exertion levels and short-term maximum sensor indicated rates; computing intermediate-term averages of the short-term maximum exertion levels and sensor indicated rates; computing a sensor target rate as a function of the intermediate-term average short-term maximum exertion level and the patient'"'"'s maximum exercise capacity as defined by a long-term maximum exertion level; and
,periodically adjusting the slope of the rate response curve in accordance with the difference between the intermediate-term average maximum sensor indicated rate and the sensor target rate. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method 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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collecting short-term maximum exertion levels; periodically updating a long-term maximal exertion level of the patient to equal a maximum among the collected short-term maximum exertion levels during a specified time period; and
,adjusting the slope of the rate response curve in order for the updated long-term maximal exertion level to be mapped to a specified maximum sensor indicated rate. - View Dependent Claims (21, 22, 23, 24)
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Specification