Rate-adaptive therapy with sensor cross-checking
First Claim
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1. A system, comprising:
- level sensor for measuring exertion levels;
an activity level sensor;
a processor coupled to the exertion level sensor and the activity level sensor;
a pulse generator coupled to the processor for delivering pacing pulses in accordance with a rate-adaptive pacing mode based upon a rate-response curve; and
,wherein the processor is programmed to;
determine a resting exertion level from the measured exertion levels;
determine a maximum exertion level from the measured exertion levels;
associate the maximum exertion level with a corresponding activity level;
estimate a maximum exercise capacity by cross-checking the maximum exertion level with the corresponding activity level; and
adjust a response factor based on the estimated maximum exercise capacity and the resting exertion level, the response factor being a slope of the rate-response curve in a rate-adaptive cardiac pacing mode.
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Abstract
A method and system for automatically adjusting the operating parameters of a rate-adaptive cardiac pacemaker in which maximum exertion levels attained by the patient are measured at periodic intervals and stored in order to compute or update a maximum exercise capacity. The slope of the rate-response curve is then adjusted to map an exertion level corresponding to the updated maximum exercise capacity to a maximum allowable pacing rate. In accordance with the invention, a maximum exercise capacity is determined by cross-checking periodic maximum exertion level sensor values with a motion-level sensor value.
125 Citations
25 Claims
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1. A system, comprising:
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level sensor for measuring exertion levels; an activity level sensor; a processor coupled to the exertion level sensor and the activity level sensor; a pulse generator coupled to the processor for delivering pacing pulses in accordance with a rate-adaptive pacing mode based upon a rate-response curve; and
,wherein the processor is programmed to; determine a resting exertion level from the measured exertion levels; determine a maximum exertion level from the measured exertion levels; associate the maximum exertion level with a corresponding activity level; estimate a maximum exercise capacity by cross-checking the maximum exertion level with the corresponding activity level; and adjust a response factor based on the estimated maximum exercise capacity and the resting exertion level, the response factor being a slope of the rate-response curve in a rate-adaptive cardiac pacing mode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method, comprising:
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measuring exertion levels; measuring activity levels; determining a resting exertion level from the measured exertion levels; determining a maximum exertion level from the measured exertion levels; associating the maximum exertion level with a corresponding activity level; estimating a maximum exercise capacity by cross-checking the maximum exertion level with the corresponding activity level; and adjusting a response factor based on the estimated maximum exercise capacity and the resting exertion level, the response factor being a slope of a rate-response curve in a rate-adaptive cardiac pacing mode. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system comprising:
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means for measuring exertion levels and determining resting and maximum exertion levels; means for measuring activity levels and associating the maximum exertion level with a corresponding activity level measurement; means for estimating a maximum exercise capacity by cross-checking the maximum exertion level with the corresponding activity level measurement; means for delivering pacing pulses in accordance with a rate-adaptive pacing mode based upon a rate-response curve; and
,means for adjusting a response factor based on the estimated maximum exercise capacity and the resting exertion level, the response factor being a slope of the rate-response curve in the rate-adaptive cardiac pacing mode. - View Dependent Claims (22, 23, 24, 25)
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Specification