Hemodynamic analysis
First Claim
1. A method of monitoring changes in a living body, the method comprising:
- measuring a hemodynamic variable of a living body during two different cycles of a cyclical function of the body, the hemodynamic variable being measured at substantially the same instant in each cycle; and
comparing values of the hemodynamic variable measured during the two different cycles.
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Accused Products
Abstract
To track significant changes in a hemodynamic variable of a living body regardless of measurement noise induced by cyclical functions of the body, the hemodynamic variable is measured at substantially the same instant during several cycles and the measured values compared to identify any statistically significant changes. The measurements may be discrete or continuous. The heart may be stimulated by a cardiac device during some of the cycles and parameters of the device such as the A-V delay of a pacemaker may be adjusted in accordance with the measured change in the hemodynamic variable, which may be, among others, blood pressure or blood volume.
74 Citations
45 Claims
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1. A method of monitoring changes in a living body, the method comprising:
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measuring a hemodynamic variable of a living body during two different cycles of a cyclical function of the body, the hemodynamic variable being measured at substantially the same instant in each cycle; and
comparing values of the hemodynamic variable measured during the two different cycles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. In an implantable cardiac stimulation device implanted in a patient'"'"'s body, a method comprising:
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measuring a hemodynamic variable of the body at a first instant during a first cycle of a selected cyclical function of the body;
operating the cardiac device to stimulate the heart of the body during a second cycle of the function;
measuring the hemodynamic variable at an instant during the second cycle that is substantially the same as the first instant; and
adjusting an operating parameter of the cardiac device in accordance with a difference between values of the hemodynamic variable measured during the first and second cycles. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A method of operating a cardiac stimulation device implanted in a patient and configured to provide pacing pulses to the heart of the patient, the method comprising:
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measuring a hemodynamic variable of the patient at a first instant during a first respiratory cycle of the patient;
operating the cardiac device to stimulate the heart of the patient during a second respiratory cycle of the patient;
measuring the hemodynamic variable at an instant during the second respiratory cycle that is substantially the same as the first instant; and
adjusting any one or more of an atrio-ventricular delay, an interchamber delay, and RV-LV delay, and an LA-LV delay of the cardiac device in accordance with a difference between values of the hemodynamic variable measured during the first and second respiratory cycles. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. An apparatus for monitoring changes in a living body, comprising:
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a detector configured to measure a hemodynamic variable of a living body during two different cycles of a cyclical function of the body and at substantially the same instant in each cycle; and
a controller configured to compare values of the hemodynamic variable measured during the two different cycles. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45)
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Specification