Method and system of determining cardiac contractility
First Claim
1. A method of determining the cardiac contractility of a cardiovascular system, said method comprising:
- determining a value for the stroke volume of the cardiovascular system;
determining a value for the preload of the cardiovascular system;
determining a value for the afterload of the cardiovascular system;
utilizing the value of said stroke volume, the value of said preload, and the value of said afterload to determine said cardiac contractility; and
wherein said preload comprises a parameter selected from the group consisting of end-diastolic volume, end-diastolic volume index, end-diastolic pressure, pulmonary capillary pressure, end-diastolic stress, and left ventricle end-diastolic dimension.
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Accused Products
Abstract
A method and system is provided for determining the cardiac contractility of a cardiovascular system. The method includes utilizing values representing stroke volume, preload, and afterload to calculate the cardiac contractility. The calculation may include a mathematical relationship in which the cardiac contractility is represented by a first edge of a tetrahedron, the preload is represented by a second edge of the tetrahedron, the afterload is represented by a third edge of the tetrahedron, and the stroke volume is represented by the volume of the tetrahedron. A display apparatus is also provided. The display apparatus includes a schematic representation of a tetrahedron and indicia indicating that the cardiac contractility, the preload, the afterload, and the stroke volume are represented by mutually distinct parameters of the tetrahedron.
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Citations
21 Claims
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1. A method of determining the cardiac contractility of a cardiovascular system, said method comprising:
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determining a value for the stroke volume of the cardiovascular system;
determining a value for the preload of the cardiovascular system;
determining a value for the afterload of the cardiovascular system;
utilizing the value of said stroke volume, the value of said preload, and the value of said afterload to determine said cardiac contractility; and
wherein said preload comprises a parameter selected from the group consisting of end-diastolic volume, end-diastolic volume index, end-diastolic pressure, pulmonary capillary pressure, end-diastolic stress, and left ventricle end-diastolic dimension. - View Dependent Claims (2, 3, 4, 5)
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6. A method of determining the cardiac contractility of a cardiovascular system, said method comprising:
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determining a value for the stroke volume of the cardiovascular system;
determining a value for the preload of the cardiovascular system;
determining a value for the afterload of the cardiovascular system;
utilizing the value of said stroke volume, the value of said preload, and the value of said afterload to determine said cardiac contractility; and
wherein said afterload comprises a parameter selected from the group consisting of arterial pressure, left ventricle systolic pressure, arterial impedance, vascular resistance, systolic pressure, left ventricle meridional stress, left ventricle circumferential stress, and systolic stress. - View Dependent Claims (7, 8, 9, 10, 11)
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12. A display apparatus for displaying the cardiac contractility of a cardiovascular system, the display apparatus comprising:
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a computer usable medium having computer readable program code embodied therein, said computer usable medium having;
computer readable program code for schematically representing a tetrahedron; and
computer readable program code for generating indicia correlating said cardiac contractility, the preload of said cardiovascular system, the afterload of said cardiovascular system, and the stroke volume of said cardiovascular system to mutually distinct parameters of said tetrahedron. - View Dependent Claims (13, 14, 15, 16)
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17. An instructional tool for teaching principles of cardiovascular function to non-medical personnel, said instructional tool including one or more display apparatuses, the display apparatuses including:
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a computer usable medium having computer readable program code embodied therein, said computer usable medium having;
computer readable program code for schematically representing a tetrahedron; and
computer readable program code for generating indicia correlating cardiac contractility, preload, afterload, and stroke volume to mutually distinct parameters of said tetrahedron.
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18. A measurement system for determining the cardiac contractility of a cardiovascular system, comprising a processor which:
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receives an input value representing the stroke volume of the cardiovascular system;
receives an input value representing the preload of the cardiovascular system;
receives an input value representing the afterload of the cardiovascular system; and
determines said cardiac contractility utilizing said input value representing said stroke volume, said input value representing said preload, and said input value representing said afterload;
wherein said preload comprises a parameter selected from the group consisting of end-diastolic volume, end-diastolic volume index, end-diastolic pressure, pulmonary capillary pressure, end-diastolic stress, and left ventricle end-diastolic dimension. - View Dependent Claims (19, 21)
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20. A measurement system for determining the cardiac contractility of a cardiovascular system, comprising a processor which:
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receives an input value representing the stroke volume of the cardiovascular system;
receives an input value representing the preload of the cardiovascular system;
receives an input value representing the afterload of the cardiovascular system; and
determines said cardiac contractility utilizing said input value representing said stroke volume, said input value representing said preload, and said input value representing said afterload;
wherein said afterload comprises a parameter selected from the group consisting of arterial pressure, left ventricle systolic pressure, arterial impedance, vascular resistance, systolic pressure, left ventricle meridional stress, left ventricle circumferential stress, and systolic stress.
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Specification