Self-calibrating rate-adaptive pacemaker
First Claim
1. A system for automatically adjusting responsiveness of a rate-adaptive pacemaker by using a rate response curve mapping measured exertion levels to a sensor indicated rate, the system comprising:
- means for collecting short-term maximum exertion levels and short-term maximum sensor indicated rates;
means for computing an intermediate-term average maximum exertion level being an average of the short-term maximum exertion levels and an intermediate-term average maximum sensor indicated rate being an average of the short-term maximum sensor indicated rates;
means for computing a sensor target rate as a function of the intermediate-term average maximum exertion level and a long-term maximum exertion level; and
means for periodically adjusting a slope of the rate response curve using the intermediate-term 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.
55 Citations
20 Claims
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1. A system for automatically adjusting responsiveness of a rate-adaptive pacemaker by using a rate response curve mapping measured exertion levels to a sensor indicated rate, the system comprising:
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means for collecting short-term maximum exertion levels and short-term maximum sensor indicated rates; means for computing an intermediate-term average maximum exertion level being an average of the short-term maximum exertion levels and an intermediate-term average maximum sensor indicated rate being an average of the short-term maximum sensor indicated rates; means for computing a sensor target rate as a function of the intermediate-term average maximum exertion level and a long-term maximum exertion level; and means for periodically adjusting a slope of the rate response curve using the intermediate-term average maximum sensor indicated rate and the sensor target rate. - View Dependent Claims (2, 3, 4)
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5. A system for automatically adjusting a rate-adaptive pacemaker, the system comprising:
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a sensor adapted to sense exertion levels; and a microprocessor coupled to the sensor, the microprocessor adapted to; collect short-term maximum exertion levels using the exertion levels sensed during a specified short-term period; compute an intermediate-term average maximum exertion level being an average of the short-term maximum exertion levels collected during a specified intermediate-term period; adjust a slope of a rate response curve using the intermediate-term average maximum exertion level and a long-term maximum exertion level, the rate response curve mapping the exertion levels to a pacing rate; and adjust the pacing rate using the sensed exertion levels and the rate response curve. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method for adjusting a rate-adaptive pacemaker, the method comprising:
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sensing exertion levels; adjusting a pacing rate using the sensed exertion levels and a rate response curve mapping the exertion levels to the pacing rate; collecting short-term maximum exertion levels using the exertion levels sensed during a specified short-term period; computing an intermediate-term average maximum exertion level being an average of the short-term maximum exertion levels collected during a specified intermediate-term period; and adjusting a slope of the rate response curve using the intermediate-term average maximum exertion level and a long-term maximum exertion level. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification