Methods and systems that use implanted posture sensor to monitor pulmonary edema
First Claim
1. A method to monitor pulmonary edema of a patient, comprising:
- (a) detecting, using an implanted posture sensor, when a posture of the patient changes from a first predetermined posture to a second predetermined posture;
(b) determining, based on an impedance signal, an amount of time it takes the impedance signal to achieve a steady state after the posture of the patient changes from the first predetermined posture to the second predetermined posture,where the impedance signal is obtained using implanted electrodes and is indicative of at least one of left atrial pressure or intra-thoracic fluid volume of the patient, andwhere the amount of time it takes the impedance signal to achieve a steady state, after the posture of the patient changes from the first predetermined posture to the second predetermined posture, is indicative of a degree of pulmonary edema; and
(c) monitoring the pulmonary edema of the patient based on the determined amount of time it takes the impedance signal to achieve the steady state after the posture of the patient changes from the first predetermined posture to the second predetermined posture.
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Abstract
In specific embodiments, a method to monitor pulmonary edema of a patient, comprises (a) detecting, using an implanted posture sensor, when a posture of the patient changes from a first predetermined posture to a second predetermined posture, (b) determining an amount of time it takes an impedance signal to achieve a steady state after the posture of the patient changes from the first predetermined posture to the second predetermined posture, where the impedance signal is obtained using implanted electrodes and is indicative of left atrial pressure and/or intra-thoracic fluid volume of the patient, and (c) monitoring the pulmonary edema of the patient based on the determined amount of time it takes the impedance signal to achieve the steady state after the posture of the patient changes from the first predetermined posture to the second pre-determined posture.
27 Citations
14 Claims
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1. A method to monitor pulmonary edema of a patient, comprising:
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(a) detecting, using an implanted posture sensor, when a posture of the patient changes from a first predetermined posture to a second predetermined posture; (b) determining, based on an impedance signal, an amount of time it takes the impedance signal to achieve a steady state after the posture of the patient changes from the first predetermined posture to the second predetermined posture, where the impedance signal is obtained using implanted electrodes and is indicative of at least one of left atrial pressure or intra-thoracic fluid volume of the patient, and where the amount of time it takes the impedance signal to achieve a steady state, after the posture of the patient changes from the first predetermined posture to the second predetermined posture, is indicative of a degree of pulmonary edema; and (c) monitoring the pulmonary edema of the patient based on the determined amount of time it takes the impedance signal to achieve the steady state after the posture of the patient changes from the first predetermined posture to the second predetermined posture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system to monitor pulmonary edema of a patient comprising:
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an implantable posture sensor adapted to determine a posture of the patient; an implantable impedance sensor adapted to obtain, using implanted electrodes, an impedance signal indicative of at least one of left atrial pressure or intra-thoracic fluid volume of the patient; and a pulmonary edema monitor adapted to determine, based on the impedance signal, an amount of time it takes the impedance signal to achieve a steady state after the posture of the patient changes from a first predetermined posture to a second predetermined posture, where the amount of time it takes the impedance signal to achieve a steady state, after the posture of the patient changes from the first predetermined posture to the second predetermined posture, is indicative of a degree of pulmonary edema; and monitor the pulmonary edema of the patient based on the determined amount of time it takes the impedance signal to achieve the steady state after the posture of the patient changes from the first predetermined posture to the second predetermined posture. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification