• Br J Anaesth · Aug 1979

    Comparative Study Clinical Trial Controlled Clinical Trial

    Comparison of anti-pollution modifications of Mapleson A and D anaesthetic systems.

    • P K Andersen and P Hole.
    • Br J Anaesth. 1979 Aug 1; 51 (8): 797-9.

    AbstractHafnia A and Hafnia D anaesthetic systems are non-polluting modifications of the Mapleson A and D systems. The excess gas is vented in the Hafnia systems directly and continuously via a calibrated ejector flowmeter. Sixteen adult patients anaesthetized for abdominal surgery were ventilated and either Hafnia A or D systems at six different fresh gas flows. No difference between the Hafnia A and D systems could be demonstrated in the values of arterial carbon dioxide tension measured with the same fresh gas flow, despite gas flows in opposite directions.

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