Physiological response to posture change
First Claim
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1. A method comprising:
- using an implantable medical device to determine a change in a posture of a body;
determining a change in a physiological parameter in response to the change in posture; and
generating a device response as a function of the change in the physiological parameter,wherein the physiological parameter includes one or more of a heart rate, a heart rate variability, a heart sound, a respiration rate, and a blood pressure, and the change in the physiological parameter comprises at least one of;
a sensed change in heart rate that is less than a normal subject'"'"'s change in heart rate;
a sensed change in blood pressure that is more than a normal subject'"'"'s change in blood pressure;
a sensed change in heart sound energy that is less than a normal subject'"'"'s change in heart sound energy;
a sensed change in heart rate variability that is less than a normal subject'"'"'s change in heart rate variability; and
a sensed decrease in respiration rate; and
further comprising comparing the change in the physiological parameter, the comparison comprising comparing (1) a ratio of the physiological parameter in the first posture to the physiological parameter in the second posture for a subject with a possible health condition, to (2) the ratio of the physiological parameter in the first posture to the physiological parameter in the second posture for a normal subject or population.
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Abstract
In an embodiment, an implantable medical device includes a controller circuit, a posture sensing circuit, and a physiological sensing circuit. The controller circuit senses a change in a physiological signal as a result of a change in posture, and generates a response as a function of that change. In another embodiment, the controller circuit identifies a heart failure condition as a function of the change in the physiological signal.
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Citations
11 Claims
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1. A method comprising:
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using an implantable medical device to determine a change in a posture of a body; determining a change in a physiological parameter in response to the change in posture; and generating a device response as a function of the change in the physiological parameter, wherein the physiological parameter includes one or more of a heart rate, a heart rate variability, a heart sound, a respiration rate, and a blood pressure, and the change in the physiological parameter comprises at least one of; a sensed change in heart rate that is less than a normal subject'"'"'s change in heart rate; a sensed change in blood pressure that is more than a normal subject'"'"'s change in blood pressure; a sensed change in heart sound energy that is less than a normal subject'"'"'s change in heart sound energy; a sensed change in heart rate variability that is less than a normal subject'"'"'s change in heart rate variability; and a sensed decrease in respiration rate; and further comprising comparing the change in the physiological parameter, the comparison comprising comparing (1) a ratio of the physiological parameter in the first posture to the physiological parameter in the second posture for a subject with a possible health condition, to (2) the ratio of the physiological parameter in the first posture to the physiological parameter in the second posture for a normal subject or population. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification