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British Journal of Anaesthesia, 1980, Vol. 52, No. 1 29-40
© 1980 The Board of Management and Trustees of the British Journal of Anaesthesia

research-article

MASS SPECTROMETER MEASUREMENT OF OXYGEN UPTAKE AND CARBON DIOXIDE EXCHANGE DURING CARDIOPULMONARY BYPASS

T. R. ABBOTT, M.B., CH.B., F.F.A.R.C.S., B. GOODWIN, M.B., CH.B., F.F.A.R.C.S., G. CLARK, M.B., CH.B., F.F.A.R.C.S. and G. J. REES, M.B., CH.B., F.F.A.R.C.S.

Royal Liverpool Children's Hospital Myrtle Street, Liverpool L7 7DG

Correspondence to T. R. A.

Oxygen uptake (Vo2) and carbon dioxide output (Vco2) were measured continuously in four children during cardiopulmonary bypass, using the variation in concentration of a tracer gas, argon, as a measure of flow, and a mass spectrometer to monitor gas concentrations. Normal values for the ratio of Vco2 : Vot (= 0.8) indicated that gas exchange equilibrium had been established following sudden changes in body temperature. During rapid cooling, 10% carbon dioxide is necessary to ensure carbon dioxide homeostasis within the body.


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