Method and apparatus for determining cardiac output
First Claim
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1. An apparatus for measuring cardiac output comprising:
- means for measuring a first parameter indicative of a patient'"'"'s oxygen uptake;
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 an estimate of such a patient'"'"'s cardiac output based on the output of the first parameter and the second parameter; and
outputting means for outputting a result indicative of such a patient'"'"'s cardiac output.
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Abstract
A method and apparatus for use in determining the cardiac output. The method includes measuring a first parameter indicative of a patient'"'"'s oxygen uptake 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. An apparatus for measuring cardiac output comprising:
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means for measuring a first parameter indicative of a patient'"'"'s oxygen uptake; 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 an estimate of such a patient'"'"'s cardiac output based on the output of the first parameter and the second parameter; and outputting means for outputting a result indicative of such a patient'"'"'s cardiac output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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13. A method for measuring cardiac output comprising:
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(1) measuring a first parameter indicative of a patient'"'"'s oxygen uptake 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 first parameter and the second parameter measurements set forth in step (1); and (4) determining an estimate of the patient'"'"'s cardiac output based on the first parameter and the second parameter information collected in steps (1) and (3).
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Specification