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British Journal of Anaesthesia, 1985, Vol. 57, No. 8 803-806
© 1985 The Board of Management and Trustees of the British Journal of Anaesthesia

research-article

THE MINIMUM RESERVOIR CAPACITY NECESSARY TO AVOID AIR-DILUTION

A. NAUNTON, M.B., CH.B., F.F.A.R.C.S

Westminster Hospital London SW1.
Present address: Department of Anaesthetics, Brompton Hospital, Fulham Road, London SW3 6HP.

The fresh gas flow rate necessary to prevent rebreathing in 1-piece anaesthesia is well established at twice total ventilation. The minimum reservoir volume to avoid air dilution of anaesthetic gases in the alveolus at this flow rate is, however, undecided. A lung model was constructed to represent spontaneous respiration, and the value of minimum reservoir volume as a proportion of tidal volume determined experimentally. The values so obtained were in close accord with those calculated theoretically. Extension of the theoretical analysis leads to a recommendation that a reservoir volume one-third that of tidal volume, as originally suggested by Ayre in 1956, will prevent air-dilution.


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