• S Tissot, B Delafosse, O Bertrand, Y Bouffard, J P Viale, and G Annat.
• Service d'Anesthésie-Réanimation, Hôpital E. Herriot, Lyon, France.
• Intensive Care Med. 1995 Feb 1; 21 (2): 149-53.

ObjectiveTo evaluate a monitor of pulmonary gas exchange (Deltatrac, Datex) in a clinical setting.DesignAfter in vitro evaluation, comparison over 2 min between VO2 and VCO2 values measured by the Deltatrac and the Douglas bag technique. Comparisons were also achieved over 8 h periods between the Deltatrac and a system using a mass-spectrometer.SettingPolyvalent intensive care unit (ICU 15 beds) in a 1200 bed general hospital.PatientsComparison with the Douglas bag technique in 10 patients undergoing controlled ventilation. Comparison with the mass-spectrometer system in 25 other patients undergoing controlled or pressure support ventilation.Measurements And ResultsCompared to the results obtained by the Douglas bag technique, the bias (+/- 2 SD) for VO2 and VCO2 was -3.5 +/- 26.6 and 6.1 +/- 12.7 ml.min-1, respectively. By comparison with the mass-spectrometer system, the bias for VO2 and RQ was -5.8 +/- 16.0 ml.min-1 and 0.018 +/- 0.048, respectively. No drift between the two systems was observed over time.ConclusionsThe Deltatrac appears suitable for VO2 and VCO2 measurements in ventilated patients and equivalent to a mass-spectrometer system for long term measurements.

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