Implantable cardiac device with dyspnea measurement
First Claim
1. An implantable cardiac device, comprising:
- a housing configured for implantation in a patient;
an implantable sensor configured to sense transthoracic impedance;
an implantable activity sensor configured to make an activity measurement indicative of patient activity;
a memory provided in the housing;
a controller provided in the housing and coupled to the respective sensors and the memory, the controller configured to;
determine a patient pulmonary function index indicative of patient pulmonary function based at least part on the sensed transthoracic impedance;
detect a physiological condition based on the determined index being beyond a threshold, the threshold based at least in part on a plurality of patient pulmonary function index values and associated patient activity levels; and
provide an output based, at least in part, on the detected physiological condition.
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Accused Products
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
20 Claims
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1. An implantable cardiac device, comprising:
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a housing configured for implantation in a patient; an implantable sensor configured to sense transthoracic impedance; an implantable activity sensor configured to make an activity measurement indicative of patient activity; a memory provided in the housing; a controller provided in the housing and coupled to the respective sensors and the memory, the controller configured to; determine a patient pulmonary function index indicative of patient pulmonary function based at least part on the sensed transthoracic impedance; detect a physiological condition based on the determined index being beyond a threshold, the threshold based at least in part on a plurality of patient pulmonary function index values and associated patient activity levels; and provide an output based, at least in part, on the detected physiological condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An implantable cardiac device, comprising:
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a housing configured for implantation in a patient; an implantable sensor configured to sense transthoracic impedance; an implantable activity sensor configured to sense a patient activity level; a memory provided in the housing; a controller provided in the housing and coupled to the respective sensors and the memory, the controller configured to; repeatedly determine a pulmonary function index value indicative of patient pulmonary function based at least in part on the sensed transthoracic impedance, and associate each of the pulmonary function index values with a corresponding activity level value detected at least in part by the implantable activity sensor; determine a patient'"'"'s pulmonary function versus activity level profile based at least in part on one or more of the pulmonary function index values and corresponding activity level values; and provide an output based, at least in part, on the patient'"'"'s pulmonary function versus activity level profile. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. An implantable cardiac device, comprising:
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a housing configured for implantation in a patient; an implantable sensor configured to sense transthoracic impedance; an implantable activity sensor configured to make an activity measurement indicative of patient activity; a memory provided in the housing and configured to store at least a pulmonary function versus activity level profile comprising a plurality of index values associated with different ranges of patient activity levels; a controller provided in the housing and coupled to the respective sensors and the memory, the controller configured to; determine a patient pulmonary function index indicative of patient pulmonary function based at least part on the sensed transthoracic impedance; determine a patient activity level based at least in part on the implantable activity sensor; detect a physiological condition based on the determined patient pulmonary function index exceeding an index value of the profile stored in the memory, the index value associated with an activity range of the profile which the patient activity level is determined to be within; and provide an output based, at least in part, on the detected physiological condition. - View Dependent Claims (20)
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Specification