THE CARDIAC OUTPUT IN MAN

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Abstract
The av. error of a determination of the relative concn. of ethyl iodide by an adaptation of the katharometer in Starr and Gamble''s method for the determination of cardiac output in man. is [plus or minus] 0.04 mgm. per liter or [plus or minus] 0.006% by volume. The method makes a marked saving in the operator''s time. A duplicate determination of cardiac output, including the analyses and calculation d( results, can be made in 70 min. Cardiac outputs in the lying, sitting, standing and inverted positions have been compared in fasting subjects at rest. Av. values in sitting and standing positions respectively were 87 and 82% of that when lying, and 76 and 60% per beat. In erect position, arteriovenous Oa difference was greater than in horizontal position, even with head bent, while the cardiac output per min. and per beat was less.