title: Clinical validation of the Deltatrac monitoring system in mechanically ventilated patients.
abstract: OBJECTIVE
  To evaluate a monitor of pulmonary gas exchange (Deltatrac, Datex) in a clinical setting.
  
  
  METHODS
  After 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.
  
  
  METHODS
  Polyvalent intensive care unit (ICU 15 beds) in a 1200 bed general hospital.
  
  
  METHODS
  Comparison 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.
  
  
  RESULTS
  Compared 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.
  
  
  CONCLUSIONS
  The Deltatrac appears suitable for VO2 and VCO2 measurements in ventilated patients and equivalent to a mass-spectrometer system for long term measurements.
authors.affiliation: Service d'Anesthésie-Réanimation, Hôpital E. Herriot, Lyon, France.
authors.forename: S
authors.initials: S
authors.lastname: Tissot
authors.forename: B
authors.initials: B
authors.lastname: Delafosse
authors.forename: O
authors.initials: O
authors.lastname: Bertrand
authors.forename: Y
authors.initials: Y
authors.lastname: Bouffard
authors.forename: J P
authors.initials: JP
authors.lastname: Viale
authors.forename: G
authors.initials: G
authors.lastname: Annat
mesh_terms: D000704:Analysis of Variance; D002138:Calibration; D002153:Calorimetry, Indirect / Q000295:instrumentation* / Q000706:statistics & numerical data; D005069:Evaluation Studies as Topic; D006801:Humans; D066298:In Vitro Techniques; D013058:Mass Spectrometry / Q000295:instrumentation / Q000706:statistics & numerical data; D008991:Monitoring, Physiologic / Q000295:instrumentation / Q000706:statistics & numerical data; D010101:Oxygen Consumption; D012121:Respiration, Artificial / Q000295:instrumentation* / Q000706:statistics & numerical data; D013997:Time Factors