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KMID : 0356019860010010092
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Koean Jounral of Critical Care Medicine
1986 Volume.1 No. 1 p.92 ~ p.98
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Comparison of Car4iac Output Determination by Direct Fick and Thermodilution Methods in Man
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Abstract
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Measurement of cardiac output by thermodiiution method is easy to perform and can be repeated at very short intervals and offers a number of theoretical and practical advantages.
The purpose of this paper is to reevaluate the accuracy and reproducibility of the thermodilution cardiac output by comparing the results with those obtained by the direct Fick technique.
From January through April, 198I (4 months), 26 simultaneous cardiac output measurements were made using thermodilution and dlreck Fick methods in 12 patients in the intensive care unit of Severance Hospital following open heart surgery.
The average age of the patients was 34.8±12.0 (SD) years (range, 17-57 years). For cardiac output determination by thermodiiution technique (COTD) a Swan-Ganz Therrnodi1utlon Catheter, Model 93A-131-7F (Edwards Laboratories), a Cardiac Output Computer, Model 9520A, and Strip Chart Recorder, Model 9810 (Edwards L aboratories) were used. For the determination of cardiac output by direct Fick principle (COFick), a VanSlyke Manometrie Apparatus (Thomas) for the measurements of arteriovenous oxygen content difference and a Coilin´s Respirometer with Kymograph for the measurement of oxygen consumption were used, The correlation between the simultaneously measured COTD and COFick was found to be COFick = 0.95. COTD + 0.1073, (r= 0.9777, P $lt; 0,001).
For 26 double or triple determinations of COTD, the values ranged from 1.77 L/min to 6.66 L/min, with a reproducibility of 2.18%. The maximum difference of COTD for COFick was between +11,99% and -12.99% (Mean±SD = 6.07±3.97%).
Measurement of cardiac output by thermodilution method provides a simple, rapid, reproduclb1e and highly accurate method for multipie cardiac output measurements suitable for use at the bedside.
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