System and Method for Determining Arterial Compliance and Stiffness
First Claim
1. A system for calculating an arterial compliance index for determining the arterial stiffness of an artery of a subject, wherein the system does not excite the artery to induce a perturbation in the artery, the system comprising:
- a blood pressure monitoring device configured to measure a systolic blood pressure reading and a diastolic blood pressure reading for the artery of the subject;
a blood flow velocity monitoring device configured to measure a peak-systolic blood flow velocity, wherein the peak-systolic blood flow velocity is a first measure of velocity of blood flowing within the artery of the subject at a peak point of a systolic phase of contraction of the subject'"'"'s heart muscle, and an end-diastolic blood flow velocity, wherein the end-diastolic blood flow velocity is a second measure of velocity of blood flowing within the artery of the subject at an end point of a diastolic phase of relaxation of the subject'"'"'s heart muscle; and
a central processing unit configured to calculate the arterial compliance index as a function of the subject'"'"'s;
(a) systolic blood pressure reading as measured by the blood pressure monitoring device;
(b) diastolic blood pressure reading as measured by the blood pressure monitoring device;
(c) peak-systolic blood flow velocity determined during the systolic phase of contraction of the subject'"'"'s heart muscle; and
(d) end-diastolic blood flow velocity determined during a period of relaxation of the subject'"'"'s heart muscle.
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Abstract
A system and method for calculating the arterial compliance, stiffness, and arterial flow and resistance indices for any artery in issue of a subject having a blood pressure monitoring device configured to calculate systolic and diastolic blood pressure readings for an artery of the subject, a blood flow velocity monitoring device configured to calculate the velocity of blood flowing within the artery of the subject at a peak point of a systolic phase of contraction of the subject'"'"'s heart muscle, peak-systolic velocity, and the velocity of blood flowing within the artery of the subject at an end point of a diastolic phase of the subject'"'"'s heart muscle, end-diastolic velocity, and a central processing unit comprising a computer readable program embodied within the central processing unit configured to calculate the arterial compliance, stiffness, and arterial flow and resistance indices as a function of the area of the artery under initial systolic and end diastolic pressure, the area of the artery generating arterial elastic recoil pressure for continuous flow during the systolic and diastolic phases, peak-systolic and end-diastolic arterial flow velocities, and systolic and diastolic blood pressure.
23 Citations
30 Claims
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1. A system for calculating an arterial compliance index for determining the arterial stiffness of an artery of a subject, wherein the system does not excite the artery to induce a perturbation in the artery, the system comprising:
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a blood pressure monitoring device configured to measure a systolic blood pressure reading and a diastolic blood pressure reading for the artery of the subject; a blood flow velocity monitoring device configured to measure a peak-systolic blood flow velocity, wherein the peak-systolic blood flow velocity is a first measure of velocity of blood flowing within the artery of the subject at a peak point of a systolic phase of contraction of the subject'"'"'s heart muscle, and an end-diastolic blood flow velocity, wherein the end-diastolic blood flow velocity is a second measure of velocity of blood flowing within the artery of the subject at an end point of a diastolic phase of relaxation of the subject'"'"'s heart muscle; and a central processing unit configured to calculate the arterial compliance index as a function of the subject'"'"'s; (a) systolic blood pressure reading as measured by the blood pressure monitoring device; (b) diastolic blood pressure reading as measured by the blood pressure monitoring device; (c) peak-systolic blood flow velocity determined during the systolic phase of contraction of the subject'"'"'s heart muscle; and (d) end-diastolic blood flow velocity determined during a period of relaxation of the subject'"'"'s heart muscle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for calculating an arterial compliance index for determining the arterial stiffness of an artery of a subject, wherein the system does not excite the artery to induce a perturbation in the artery, the system comprising:
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a blood pressure monitoring device configured to measure a systolic blood pressure reading and a diastolic blood pressure reading for the artery of the subject; a device for measuring a first diameter of the artery at a peak systolic pressure and a second diameter of the artery at a peak diastolic pressure; a central processing unit configured to calculate the arterial compliance index as a function of the subject'"'"'s; (a) systolic blood pressure reading as measured by the blood pressure monitoring device; (b) diastolic blood pressure reading as measured by the blood pressure monitoring device; (c) the first diameter of the artery determined at a peak systolic phase of contraction of the subject'"'"'s heart muscle as measured by the device; and (d) the second diameter of the artery determined at a peak diastolic phase of relaxation of the subject'"'"'s heart muscle as measured by the device. - View Dependent Claims (13)
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14. A system for calculating an arterial compliance index for determining the arterial stiffness of an artery of a subject, wherein the system does not excite the artery to induce a perturbation in the artery, the system comprising:
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a blood pressure monitoring device configured to measure a systolic blood pressure reading and a diastolic blood pressure reading for the artery of the subject; a device for measuring a first area of the artery at a peak systolic pressure and a second area of the artery at a peak diastolic pressure; a central processing unit configured to calculate the arterial compliance index as a function of the subject'"'"'s; (a) systolic blood pressure reading as measured by the blood pressure monitoring device; (b) diastolic blood pressure reading as measured by the blood pressure monitoring device; (c) the first area of the artery determined at a peak systolic phase of contraction of the subject'"'"'s heart muscle as measured by the device; and (d) the second area of the artery determined at a peak diastolic phase of relaxation of the subject'"'"'s heart muscle as measured by the device. - View Dependent Claims (15)
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16. A system for calculating an arterial compliance index for determining the arterial stiffness of the ascending aorta artery of a subject, wherein the system does not excite the artery to induce a perturbation in the artery, the system comprising:
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a blood pressure monitoring device configured to measure a systolic blood pressure reading and a diastolic blood pressure reading for the artery of the subject; a device for measuring a systole time, wherein the systole time is defined as a time during which the left ventricle of the heart of the subject is contracting and for measuring a diastole time, wherein the diastole time is defined as a time during which the left ventricle of the heart of the subject is relaxing; a heart rate measuring device for determining the heart rate of the subject; and a central processing unit configured to calculate the arterial compliance index as a function of the subject'"'"'s; (a) systolic blood pressure reading as measured by the blood pressure monitoring device; (b) diastolic blood pressure reading as measured by the blood pressure monitoring device; (c) the heart rate; (d) the systole time; and (e) the diastole time. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification