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Indirect Calorimetry in Mechanically Ventilated Patients: A Prospective, Randomized, Clinical Validation of 2 Devices Against a Gold Standard. | LitMetric
Background And Aims : The 2 currently available indirect calorimeters, CCM Express Indirect Calorimeter (MedGraphics, St Paul, MN) and Quark RMR ICU Indirect Calorimeter (COSMED, Rome, Italy), have not been validated against a gold standard in mechanically ventilated patients. Our aim was to do so using a gold-standard, modified Tissot bell-spirometer method in mechanically ventilated patients who were hemodynamically, respiratory, and metabolically stable.Methods : We studied 30 patients undergoing general anesthesia and major gynecological surgery. We measured oxygen consumption ([Formula: see text]O) and resting energy expenditure (REE) in a randomized, sequential, crossover design with double determination of each device.Results : Compared with the modified Tissot bell-spirometer, the CCM Express Indirect Calorimeter demonstrated a mean Δ-REE of +361 kcal/d, corresponding to a 31% overestimation of energy requirements. Bland-Altman analysis for REE showed a mean (SD) bias of 384 (124) with limits of agreement 142-627 kcal/d. QUARK RMR ICU demonstrated a mean Δ-REE of 81 kcal/d, corresponding to a 7% overestimation of energy requirements. Bland-Altman plot analysis showed a mean (SD) bias of 77 (167) with limits of agreement -249 to 404 kcal/d.Conclusions : The QUARK RMR ICU Indirect Calorimeter compared better with the gold standard for values of [Formula: see text]O and REE than did the CCM Express Indirect Calorimeter in mechanically ventilated patients who were circulatory and respiratory stable. Both indirect calorimeters had low precision.
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