title: Measurement of oxygen uptake: a method for use during nitrous oxide in oxygen anaesthesia.
abstract: A new method for oxygen uptake (VO2) measurement based on a constant volume closed circuit is discussed. The accuracy of the method tested in the laboratory was demonstrated to be +/- 1.8% and estimated to be +/- 2.01% in clinical use during abdominal surgery. The 0-90% rise time of the measurement to step changes in VO2 was found to be 42 s, for a change of 15 ml min-1 with a lag time of less than 30 s.
mesh_terms: D000758:Anesthesia; D006801:Humans; D009609:Nitrous Oxide; D010100:Oxygen / Q000502:physiology*; D011659:Pulmonary Gas Exchange; D012129:Respiratory Function Tests / Q000379:methods
chemical_list: D009609:Nitrous Oxide; D010100:Oxygen