IMPLANTABLE CARDIAC DEVICE WITH DYSPNEA MEASUREMENT
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Abstract
Cardiac monitoring and/or stimulation methods and systems employing dyspnea measurement. An implantable cardiac device may sense transthoracic impedance and determine a patient activity level. An index indicative of pulmonary function is implantably computed to detect an episode of dyspnea based on a change, trend, and/or value exceeding a threshold at a determined patient activity level. Trending one or more pulmonary function index values may be done to determine a patient'"'"'s pulmonary function index profile, which may be used to adapt a cardiac therapy. A physician may be automatically alerted in response to a pulmonary function index value and/or a trend of the patient'"'"'s pulmonary index being beyond a threshold. Computed pulmonary function index values and their associated patient'"'"'s activity levels may be stored periodically in a memory and/or transmitted to a patient-external device.
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Citations
21 Claims
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1. (canceled)
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2. A system, comprising:
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a respiration sensor configured to sense respiration of a patient; an activity sensor configured to sense an activity level of the patient; a controller operatively coupled to the respiration sensor and the activity sensor, the controller configured to; determine a patient index based at least part on the sensed respiration of the patient; detect a physiological condition based on the determined patient index being beyond a threshold, wherein the threshold is based at least in part on the sensed activity level of the patient; and provide an output based, at least in part, on the detected physiological condition. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system, comprising:
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a respiration sensor configured to sense respiration of a patient; an activity sensor configured to sense an activity level of the patient; a controller operatively coupled to the respiration sensor and the activity sensor, the controller configured to; repeatedly determine a patient index value based at least in part on the sensed respiration of the patient, and associate each of the patient index values with a corresponding activity level detected at least in part by the activity sensor; determine a patient index versus activity level profile for the patient based at least in part on one or more of the patient index values and corresponding activity levels; and provide an output based, at least in part, on the patient index versus activity level profile. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A system, comprising:
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a respiration sensor configured to sense transthoracic impedance of a patient; an activity sensor configured to sense an activity level of the patient; a controller operatively coupled to the respiration sensor and the activity level sensor, the controller configured to; record a plurality of patient index values over time, each of the plurality of patient index values based at least part on the sensed transthoracic impedance; record a plurality of patient activity levels over time; detect a physiological condition based on one or more of the recorded patient index values exceeding a threshold, wherein the threshold is dependent on one or more of the recorded patient activity levels; and provide an output based, at least in part, on the detected physiological condition. - View Dependent Claims (21)
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Specification