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Related Experiment Videos

Nutritional assessment using a pulmonary artery catheter.

R A Cobean1, L M Gentilello, A Parker

  • 1Department of Surgery, University of Washington, Harborview Medical Center, Seattle.

The Journal of Trauma
|September 1, 1992
PubMed
Summary

Oxygen consumption (VO2) via the Fick equation (FE) accurately estimates energy expenditure (EE). This method is as reliable as indirect calorimetry (IC) for guiding nutrition over time.

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Area of Science:

  • Physiology
  • Metabolic Research

Background:

  • Accurate energy expenditure (EE) assessment is crucial for clinical nutrition.
  • Indirect calorimetry (IC) is a common method, but its single-point measurements may lack precision for long-term nutritional guidance.

Purpose of the Study:

  • To evaluate the Fick equation (FE) method for determining oxygen consumption (VO2) as a tool for estimating EE.
  • To compare the accuracy and reliability of FE-derived EE with traditional IC measurements.

Main Methods:

  • Collected 29 paired VO2 measurements using both IC and FE methods.
  • Calculated EE from FE VO2 values using the Weir equation.
  • Assessed EE variability by repeating IC and FE measurements in 8 patients.

Main Results:

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  • A strong correlation (r = 0.82, p < 0.001) was found between EE calculated by IC and FE.
  • Mean EE values were comparable: 2460 ± 539 kcal/day (IC) vs. 2372 ± 787 kcal/day (FE).
  • Variability in EE measurements over time was similar for both IC and FE methods.

Conclusions:

  • The Fick equation (FE) provides a reliable estimation of energy expenditure (EE).
  • FE is a viable alternative to indirect calorimetry (IC), offering comparable accuracy for nutritional management.
  • FE measurements demonstrate similar day-to-day variability to IC, supporting its use for predicting EE on subsequent days.