Method and apparatus for determining cardiac output
First Claim
1. A method for measuring cardiac output comprising:
- (1) quantitatively measuring a patient'"'"'s airflow, a first parameter indicative of a percent oxygen inhaled and exhaled by such a patient, and a second parameter indicative of such a patient'"'"'s fractional arterial oxygen concentration;
(2) inducing a change in such a patient'"'"'s arterial oxygen concentration;
(3) repeating the airflow, the first parameter and the second parameter measurements set forth in step (1); and
(4) determining the patient'"'"'s cardiac output based on the airflow, the first parameter, and the second parameter information collected in steps (1) and (3).
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Abstract
A method and apparatus for use in determining the cardiac output. The method include quantitatively measuring the patient'"'"'s airflow, a first parameter indicative of the percent oxygen inhaled and exhaled by the patient, and a second parameter indicative of the patient'"'"'s fractional arterial oxygen concentration. The method also includes inducing a change in the patient'"'"'s arterial oxygen concentration while taking these measurements to monitor the effects of the change in the patient'"'"'s arterial oxygen concentration. The cardiac output is determined from the data collected regarding the effects of the change in the patient'"'"'s arterial oxygen concentration.
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Citations
25 Claims
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1. A method for measuring cardiac output comprising:
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(1) quantitatively measuring a patient'"'"'s airflow, a first parameter indicative of a percent oxygen inhaled and exhaled by such a patient, and a second parameter indicative of such a patient'"'"'s fractional arterial oxygen concentration;
(2) inducing a change in such a patient'"'"'s arterial oxygen concentration;
(3) repeating the airflow, the first parameter and the second parameter measurements set forth in step (1); and
(4) determining the patient'"'"'s cardiac output based on the airflow, the first parameter, and the second parameter information collected in steps (1) and (3). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for measuring cardiac output comprising:
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a patient flow measuring system adapted to quantitatively measuring a patient'"'"'s airflow;
an oxygen analyzing system adapted to measure a first parameter indicative of a percent oxygen inhaled and exhaled by such a patient;
means for measuring a second parameter indicative of such a patient'"'"'s fractional arterial oxygen concentration;
means for inducing a change in such a patient'"'"'s arterial oxygen concentration;
a processor adapted to determine such a patient'"'"'s cardiac output based on the output of the measured airflow, the first parameter, and the second parameter; and
outputting means for outputting a result indicative of such a patient'"'"'s cardiac output in human perceivable form. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification