APPARATUS FOR MEASURING BLOOD VOLUME AND METHOD OF EVALUATING RESULT OF MEASUREMENT BY APPARATUS FOR MEASURING BLOOD VOLUME
First Claim
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1. An apparatus for measuring a blood volume, the apparatus comprising:
- a first calculator which calculates a first blood volume by using information on a cardiac output of a subject; and
a second calculator which calculates a second blood volume by us ing information on oxygen metabolism of the subject.
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Abstract
An apparatus for measuring a blood volume, includes: a first calculator which calculates a first blood volume by using information on a cardiac output of a subject; and a second calculator which calculates a second blood volume by using information on oxygen metabolism of the subject.
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Citations
17 Claims
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1. An apparatus for measuring a blood volume, the apparatus comprising:
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a first calculator which calculates a first blood volume by using information on a cardiac output of a subject; and a second calculator which calculates a second blood volume by us ing information on oxygen metabolism of the subject. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for measuring a blood volume, the apparatus comprising:
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a first calculator which calculates a first blood volume by using information on a cardiac output of a subject; and a third calculator which calculates a third blood volume from a change amount of a demand of a blood volume from a reference time to a time, the change amount being estimated by using information on a cardiac output and oxygen metabolism of the subject at the reference time. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method of evaluating a result of measurement of a blood volume by an apparatus for measuring the blood volume, the method comprising:
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inputting at least a sex, an age, a body surface area, a blood pressure, and a heart rate as specific information of a subject; calculating oxygen metabolism relating to a cardiac output of the subject and calculating a second blood volume based on the calculated oxygen metabolism; calculating a first blood volume based on a pulse wave propagation time and the heart rate, from an expression of CO=(α
K·
PWTT+β
K)·
HR where CO is the first blood volume, PWTT is the pulse wave propagation time, HR is the heart rate, and α
K and β
K are coefficients inherent to the subject; andperforming evaluation based on a difference of change rates of the first and second blood volumes which are calculated from a reference time to an estimation time when the first and second blood volumes are calculated. - View Dependent Claims (15, 16, 17)
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Specification