Accession Number:

AD0806415

Title:

A COMPARISON OF CARDIAC OUTPUT DETERMINED BY THE FICK PROCEDURE AND A DIRECT METHOD USING THE ROTAMETER,

Descriptive Note:

Corporate Author:

ARMY MEDICAL RESEARCH LAB FORT KNOX KY

Report Date:

1950-01-05

Pagination or Media Count:

13.0

Abstract:

This investigation was undertaken to determine the adequacy of the widely used Fick procedure of measuring cardiac output. The output of the heart in the closed or open-chest anesthetized dog, as determined by the Fick procedure, was compared with that simultaneously derived from a rotameter measuring right heart input or output. In general, the conventional technique of the Fick method was followed. In a few experiments, the rotameter against which the Fick method was checked was connected to the venae cavae by a cannula of special design and recorded right heart input minus coronary venous flow. In the remaining experiments, the rotameter was connected to the pulmonary artery and measured right heart output. When the results of the Fick procedure were compared with those of a direct method of high accuracy the rotameter, excellent agreement was observed in a variety of hemodynamic states. Twelve of 13 comparisons in the present work agreed within less than or - 8 per cent. This small deviation was within the range of summated errors which might have existed on the basis of known technical inaccuracies. It should be possible to determine cardiac output with an equal degree of accuracy in unanesthetized animals, provided errors in technique do not exceed those set in the present work. Author

Subject Categories:

  • Biomedical Instrumentation and Bioengineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE