1. Comparison of oxygen consumption calculated by Fick’s principle (using a central venous catheter) and measured by indirect calorimetry.
- Author
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Inadomi, Chiaki, Terao, Yoshiaki, Yamashita, Kazunori, Fukusaki, Makoto, Takada, Masafumi, and Sumikawa, Koji
- Subjects
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OXYGEN consumption , *INDIRECT calorimetry , *CENTRAL venous pressure , *CARDIAC output , *DENSITOMETRY - Abstract
We investigated the clinical usefulness of the Fick method using central venous oxygen saturation $$ Scv_{O_2 } $$ and cardiac output (CO) measured by pulse dye densitometry (PDD) for monitoring oxygen consumption ( $$ \dot V_{O_2 } $$ ). This prospective clinical study was performed in 28 mechanically ventilated postoperative patients after major abdominal surgery. $$ \dot V_{O_2 } $$ was determined by two methods, i.e., the Fick method and indirect calorimetry. The Fick method was employed using CO measured by PDD and $$ Scv_{O_2 } $$ obtained from a central venous catheter (CVC). $$ \dot V_{O_2 } $$ measured by indirect calorimetry was averaged for 15 min. Fifty-six sets of measurements were performed. $$ \dot V_{O_2 } $$ values determined by the Fick method were significantly lower than those measured by indirect calorimetry (110 ± 29 vs 148 ± 28 ml·min−1·m−2; P < 0.01). Bland and Altma analysis showed that the mean bias and precision were 33 ml·min−1·m−2 and 32 ml·min−1 −2, respectively. The correlat between the two measurements of $$ \dot V_{O_2 } $$ was weak ( r 2 = 0.145; P = 0.0038), indicating that the Fick method using PDD and $$ Scv_{O_2 } $$ is not clinically acceptable for the monitoring of $$ \dot V_{O_2 } $$ . [ABSTRACT FROM AUTHOR]
- Published
- 2008
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