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A Validation and Comparison Study of Two Metabolic Monitors

St. Paul's Hospital, Department of Surgery and Division of Critical Care Medicine, University of British Columbia, Vancouver, British Columbia, Canada

Tom Rich

St. Paul's Hospital, Department of Surgery and Division of Critical Care Medicine, University of British Columbia, Vancouver, British Columbia, Canada

Juan Ronco, M.D.

St. Paul's Hospital, Department of Surgery and Division of Critical Care Medicine, University of British Columbia, Vancouver, British Columbia, Canada

Two portable metabolic cart systems of indirect calorimetry (Deltatrac Metabolic Monitor, 2900 MMC System) were validated. CO₂ and N ₂ were delivered at precise rates into a constructed lung model to simulate CO₂ production (VCO₂) and O₂ consumption (VO₂). VCO₂ (200-400 ml/min) and VO₂ (250-750 ml/min) were measured at varying combinations of minute ventilation (VE) (6, 10, 20 liter/min) and FiO₂ (0.21, 0.30, 0.60, 0.80). VCO ₂ was measured with overall errors of 1.5% and 2.4% for the Deltatrac and 2900 monitors, respectively. VO₂ was measured with overall errors of 1.9% and 3.2% by the Deltatrac and 2900 monitors, respectively. Both monitors performed equally well for measurement of VO₂ at FiO₂ up to 0.6, but the Deltatrac had less error for measurements of VO₂ at FiO₂ of 0.8. (Journal of Parenteral and Enteral Nutrition 14:259-261, 1990)

Journal of Parenteral and Enteral Nutrition, Vol. 14, No. 3, 259-261 (1990)
DOI: 10.1177/0148607190014003259


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