Rate-adaptive therapy with sensor cross-checking
AssigneeCardiac Pacemakers, Inc.
InventorsWeimin Sun, Bruce R. Jones, Douglas J. Lang
Life of this patent
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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.
Claims28
A system, comprising:
- an exertion level sensor;
- an activity level sensor;
- and
- a processor coupled to the exertion level sensor and the activity level sensor, the processor programmed to estimate a maximum exercise capacity by determining a maximum exertion level from exertion levels measured by the exertion level sensor and cross-checking the maximum exertion level with an activity level measured by the activity level sensor, the activity level associated with the maximum exertion level.
A method, comprising:
- 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.
A system comprising:
- means for measuring exertion levels and determining a periodic maximum exertion level;
- means for measuring activity levels and associating the periodic maximum exertion level with a corresponding activity level measurement;
- and
- means for estimating a maximum exercise capacity by cross-checking the periodic maximum exertion level with the corresponding activity level measurement.
Dependencies are inferred from the claim text.