Self-calibrating rate-adaptive pacemaker
First Claim
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1. A rate-adaptive pacemaker, comprising:
- a sensor configured to sense exertion levels; and
a microprocessor coupled to the sensor, the microprocessor configured to;
collect maximum exertion levels during a specified first period;
update a maximum exercise capacity using the maximum exertion levels collected during the specified first period; and
adjust a response factor such that the updated maximum exercise capacity is mapped to a specified maximum sensor indicated rate, the response factor being a slope of a rate response curve mapping exertion levels to sensor indicated rates.
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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.
132 Citations
20 Claims
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1. A rate-adaptive pacemaker, comprising:
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a sensor configured to sense exertion levels; and a microprocessor coupled to the sensor, the microprocessor configured to; collect maximum exertion levels during a specified first period; update a maximum exercise capacity using the maximum exertion levels collected during the specified first period; and adjust a response factor such that the updated maximum exercise capacity is mapped to a specified maximum sensor indicated rate, the response factor being a slope of a rate response curve mapping exertion levels to sensor indicated rates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A rate-adaptive pacemaker, comprising:
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a sensor configured to sense exertion levels; and a microprocessor coupled to the sensor, the microprocessor configured to; collect maximum exertion levels and maximum sensor indicated rates during a specified first period; compute an average maximum exertion level using the maximum exertion levels collected during the specified first period; compute an average maximum sensor indicated rate using the maximum sensor indicated rates collected during the specified first period; compute a sensor target rate as a function of the average maximum exertion level and a maximum exercise capacity; and adjust a response factor using the average maximum sensor indicated rate and the sensor target rate, the response factor being a slope of a rate response curve that maps exertion levels to sensor indicated rates. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification