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 operatively coupled to the respective sensors and the memory, the controller configured to;
determine a patient index based at least part on the sensed transthoracic impedance;
detect a physiological condition based on the determined patient index being beyond a threshold, the threshold based at least in part on a plurality of previous patient index values and associated patient activity levels; and
provide an output based, at least in part, on the detected physiological condition.
0 Assignments
0 Petitions
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.
1 Citation
20 Claims
-
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 operatively coupled to the respective sensors and the memory, the controller configured to; determine a patient index based at least part on the sensed transthoracic impedance; detect a physiological condition based on the determined patient index being beyond a threshold, the threshold based at least in part on a plurality of previous patient 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, 11)
-
-
12. A system, comprising:
-
a sensor configured to sense transthoracic impedance; an activity sensor configured to sense a patient activity level; a memory; a controller operatively coupled to the respective sensors and the memory, the controller configured to; repeatedly determine a patient index value based at least in part on the sensed transthoracic impedance, and associate each of the patient index values with a corresponding activity level value detected at least in part by the activity sensor; determine a patient index versus activity level profile based at least in part on one or more of the patient index values and corresponding activity level values; and provide an output based, at least in part, on the patient index versus activity level profile. - View Dependent Claims (13, 14, 15, 16, 17, 18)
-
-
19. A system, comprising:
-
a sensor configured to sense transthoracic impedance; an activity sensor configured to make an activity measurement indicative of patient activity; a memory configured to store at least a patient index versus activity level profile that is based on a plurality of patient index values associated with different ranges of patient activity levels; a controller operatively coupled to the respective sensors and the memory, the controller configured to; determine 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; determine a plurality of patient activity levels over time, wherein the plurality of patient activity levels are based at least in part on the activity sensor; detect a physiological condition based on one or more patient index values exceeding a threshold of the patient index versus activity level profile, the threshold being associated with an activity range of the profile that 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)
-
Specification