COMPARISON OF THE FICK AND DYE INJECTION METHODS OF MEASURING THE CARDIAC OUTPUT IN MAN

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Abstract
The dye injn. method and the direct Fick method of measuring cardiac output were compared in 48 almost simultaneous detns. on 31 subjects. The results agreed within 25% in all but 6 detns. The distribution of results about the line of identity was symmetrical, so that the avg. of all detns. by one method was almost identical with the avg. by the other. The scatter was no greater than would be expected when known inaccuracies in both methods are considered. The data include parallel detns. of cardiac output at rest and during light and heavy exercise in normal individuals, and measurements at rest and occasionally during light exercise in patients suffering from various cardiorespiratory diseases.

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