Nutritional Assessment Using a Pulmonary Artery Catheter
Cobean-Roy-A. Gentilello-Larry-M. Parker-Ann. Jurkovich-Gregory-J. The Journal of Trauma. 1992 Sep. 33(3). pp 452-456. To determine if oxygen consumption (VO sub 2) derived from the Fick equation (FE) can be used to determine energy expenditure (EE), 29 paired indirect calorimetry (IC) and FE VO sub 2 determinations were obtained. The Weir equation was used to calculate EE from the FE VO sub 2 value. There was a strong correlation between the methods (r = 0.82, p < 0.001). Mean EE by IC and FE was 2460 +- 539 and 2372 +- 787 kcal/day, respectively, a difference of 88 +- 467 kcal/day. A single IC determination is often used to guide nutrition for several days. To evaluate this practice, FE and IC determinations were repeated in 8 patients. There was a 19% difference in EE between initial and follow-up IC, which was identical to the mean difference between paired FE and IC measurements. FE can be used to estimate EE, and is as accurate as using a single IC reading to predict EE on subsequent days.
Original Text by Clifford R. Wheeless, III, MD.
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