Inspired and expired gas concentrations in man during carbogen breathing.

Hoskin, P J; Abdelath, O; Phillips, H; Gilligan, S; Saunders, M I; Broderick, P; Baddeley, H · Radiother Oncol · 1999

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Abstract

Capnometer measurements during 46 evaluable treatments in which patients were administered carbogen (95% O2, 5% CO2) have demonstrated that the mean inspired carbon dioxide level was 3.1% (range 0-4.7) and the mean inspired oxygen concentration was 70.6% (range 26.4-94). The explanation for this observation is leakage of air into the breathing system during radiotherapy.

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