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British Journal of Anaesthesia, 1983, Vol. 55, No. 8 791-800
© 1983 The Board of Management and Trustees of the British Journal of Anaesthesia

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A SYSTEM FOR THE CONTINUOUS MEASUREMENT OF OXYGEN UPTAKE AND CARBON DIOXIDE OUTPUT IN ARTIFICIALLY VENTILATED PATIENTS

A. M. HENDERSON, B.SC, F.F.A.R.C.S., P. C. FORRESTER, F.F.A.R.C.S, R. F. ARMSTRONG, F.F.A.R.C.S., C. A. MOSSE, B.A., M.SC and D. HALSALL, B.SC

Department of Anaesthetics, University College Hospital, Gower Street London WC1
Department of Physics, University College Hospital, Gower Street London WC1

Correspondence to A. M. H.

A continuous, non-invasive system is described for measuring oxygen uptake (Formula) and carbon dioxide output (Formula) in mechanically ventilated patients. Inspiratory and mixed expiratory gas samples were pumped through fine-bore tubing to a remote mass spectrometer for analysis. The expiratory flow transducer of a Siemens Servo 900B ventilator was used for expiratory flow measurement and inspiratory flow was calculated from this using the Haldane transformation. A desk-top computer calculated Formula, Formula and respiratory quotient. The system has been validated against standard methods of gas analysis and flow measurement (Formula mean difference –lOml min–1: SD9.13; Formula mean difference 8.12ml min–1: SD4.66). Comparison with Douglas bag measurements in patients has been made (Formula mean difference 10.7ml min–1: SD9.8; Formula mean difference –1.07ml min–1: SD4.7).


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