Rate-adaptive therapy with sensor cross-checking
First Claim
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1. An implantable device, comprising:
- an exertion level sensor for measuring exertion levels;
an activity level sensor for measuring activity levels; and
,a processor for controlling the delivery of pacing pulses, wherein the processor is programmed to;
determine a periodic maximum exertion level over a specified period of time;
associate the periodic maximum exertion level with a simultaneously taken activity level measurement;
associate the simultaneously taken activity level measurement with a particular percentage of the patient'"'"'s reserve exercise capacity;
estimate a maximum exercise capacity from the periodic maximum exertion level and a percentage of reserve exercise capacity represented by the simultaneously taken activity level measurement; and
,compute the patient'"'"'s maximum exercise capacity as an average of a plurality of estimated maximum exercise capacities.
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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.
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Citations
10 Claims
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1. An implantable device, comprising:
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an exertion level sensor for measuring exertion levels; an activity level sensor for measuring activity levels; and
,a processor for controlling the delivery of pacing pulses, wherein the processor is programmed to; determine a periodic maximum exertion level over a specified period of time; associate the periodic maximum exertion level with a simultaneously taken activity level measurement; associate the simultaneously taken activity level measurement with a particular percentage of the patient'"'"'s reserve exercise capacity; estimate a maximum exercise capacity from the periodic maximum exertion level and a percentage of reserve exercise capacity represented by the simultaneously taken activity level measurement; and
,compute the patient'"'"'s maximum exercise capacity as an average of a plurality of estimated maximum exercise capacities. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification