Appropriate interpretation of indirect calorimetry for determining energy expenditure of patients in intensive care units

Cunningham, Kenneth; Aeberhardt, Laurel E.; Wiggs, Barry; Phang, P. Terry

doi:10.1016/0002-9610(94)90255-0

Cited by 26 publications

(16 citation statements)

References 10 publications

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“…22 This degree of accuracy is much more difficult to obtain with small values for VЈ O 2 and VЈ CO 2 as selected for testing in our study. Achieving results within ±5% of predicted for a VЈ O 2 of 20 mL/min would require accuracy of ±1 mL/ min.…”

Section: Discussionmentioning

confidence: 99%

“…Had trials been conducted for longer periods of time, the 95% confidence intervals for each series of trials might have been narrower. 22 Clinically, this variation creates a problem, since measurements to determine resting energy expenditure are usually made when the patient's metabolic parameters are in steady state. Steady state is determined as a time interval during which average VЈ O 2 and VЈ CO 2 change by less than 10% and average RQ changes by less than 5%.…”

Section: Discussionmentioning

confidence: 99%

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An in vitro validation of a commercially available metabolic cart using pediatric ventilator volumes

1998

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

An in vitro validation of a commercially available metabolic cart using pediatric ventilator volumes

1998

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“…All indirect calorimetry measurements were performed at steady state (33) in room air, and the metabolic cart was calibrated at the beginning of each day. All physiologic values were within normal range, and the narrow physiologic range of RQs should be considered a sensitive indicator of measurement accuracy.…”

Section: Discussionmentioning

confidence: 99%

Effect of red blood cell transfusion on oxygen consumption in the anemic pediatric patient

Grant

Huether²,

Witte³

2003

Pediatric Critical Care Medicine

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A significant increase in Vo(2) was noted after a red blood cell transfusion in pediatric patients with isovolemic anemia. These findings suggest that Vo(2) was dependent on the supply of oxygen in this subset of pediatric patients. Responding to increased oxygen delivery by increasing Vo(2) implies that these patients were functioning in a state of relative oxygen deficit and had made physiologic adaptive changes to function in this state.

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“…Data for analysis were selected from the last 10 minutes of each period according to the coefficient of variation (CV) of average VO 2 and VCO 2 across 5 consecutive 1‐minute segments, targeting a CV <5% for both gases . The mean of 5 consecutive 1‐minute segments in which the CV <5% was then calculated for use in the further analysis.…”

Section: Methodsmentioning

confidence: 99%

Reliability of, and Agreement Between, two Breath‐by‐Breath Indirect Calorimeters at Varying Levels of Inspiratory Oxygen

et al. 2019

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Background Indirect calorimetry (IC) is considered the accurate way of measuring energy expenditure (EE). IC devices often apply the Haldane transformation, introducing errors at inspiratory oxygen fraction (FiO2) >60%. The aim was to assess measurement reliability and agreement between an unevaluated IC (device 2) (Beacon Caresystem, Mermaid Care A/S, Noerresundby, Denmark) not using Haldane transformation and an IC that does (device 1) (Ecovx, GE, Helsinki, Finland) at varying FiO2. Methods Twenty healthy male subjects participated, with 16 completing the study (33 ± 9 years, 83.3 ± 16 kg, 1.83 ± 0.08 m). Subjects were mechanically ventilated in pressure support (3cmH2O; positive end‐expiratory pressure: 3cmH2O) at FiO2 of 21%, 50%, 85%, and 21% for 15 minutes at each FiO2. Mean EE, oxygen consumption (VO2), and CO2 production (VCO2) were compared within and between devices across FiO2 levels. Results Device 2 showed within‐device EE significant differences at 21% vs 50% FiO2 and device 1 for VCO2 at 50% vs. 85% FiO2. For all variables, both devices showed reliable measurements at 21% and 50% FiO2, but at 85%, FiO2 bias and limits of agreement increased. Between devices, there were significant differences for EE at both 21% and 85% FiO2 for VO2 and for VCO2 at 85% FiO2. Conclusion Both systems measured EE, VO2, and VCO2 at 21%–85% FiO2 reliably but with bias at 85% FiO2. The devices were in agreement at 21% and 50% FiO2, but further studies need to confirm accuracy at high FiO2.

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Appropriate interpretation of indirect calorimetry for determining energy expenditure of patients in intensive care units

Cited by 26 publications

References 10 publications

An in vitro validation of a commercially available metabolic cart using pediatric ventilator volumes

An in vitro validation of a commercially available metabolic cart using pediatric ventilator volumes

Effect of red blood cell transfusion on oxygen consumption in the anemic pediatric patient

Reliability of, and Agreement Between, two Breath‐by‐Breath Indirect Calorimeters at Varying Levels of Inspiratory Oxygen

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