In vitro evaluation of a compact metabolic measurement instrument.
The ability of the Datex Deltatrac (Sensor-Medics, Anaheim, CA) to accurately measure oxygen consumption (VO2v) and carbon dioxide production (VCO2) was examined in vitro using the carbon dioxide addition and nitrogen dilution methods. The accuracy of respiratory quotient (RQ = VCO2/VO2) measurements was assessed using methanol combustion (RQ = 0.67). Both in the canopy (blow-by) and respirator (FiO2: 0.21-0.6, PEEP: 0-12 cm H2O) modes the Deltatrac's measurements of VO2 and VCO2 were within +/- 7% of values predicted from CO2 and N2 simulations. Similar results were obtained with methanol combustion. In vitro testing revealed that the Deltatrac accurately measures VO2 and VCO2 under a variety of simulated clinical conditions.
Weissman
C
C
Department of Anesthesiology, College of Physicians & Surgeons, Columbia University, New York, New York 10032.
Sardar
A
A
Kemper
M
M
D002151:Calorimetry / Q000295:instrumentation*; D002153:Calorimetry, Indirect / Q000295:instrumentation*; D002245:Carbon Dioxide / Q000378:metabolism*; D004734:Energy Metabolism; D004867:Equipment Design; D005069:Evaluation Studies as Topic; D006801:Humans; D009584:Nitrogen; D010101:Oxygen Consumption; D012121:Respiration, Artificial
D002245:Carbon Dioxide; D009584:Nitrogen