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British Journal of Anaesthesia, 1967, Vol. 39, No. 8 659-666
© 1967 The Board of Management and Trustees of the British Journal of Anaesthesia

other

THE HIGH OXYGEN MIXTURES DELIVERED BY THE AIR-MIX CONTROL OF THE BIRD MARK 7 VENTILATOR

G. A. HARRISON

Department of Anaesthetics, St. Vincent's Hospital Sydney, Australia

The reasons for the high oxygen mixtures delivered by the Bird Mark 7 ventilator were investigated by measuring the flow of gases through various parts of the ventilator. The major causes were the constant flow of 100 per cent oxygen from the nebulizer, the decrease and eventual cessation of flow through the venturi as the airway pressure rose, and the decrease in the proportion of entrained air at low flow settings.


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