The Magill‐Venturi attachment: studies in volunteers and patients

Abstract

Including a venturi injector in a Magill breathing attachment reduces the requirement of compressed gases to 40% of that normally used: 100-120 ml x kg-1 x min-1. The entrainment of ambient air through the venturi injector enables the supply of an adequate flow of gas mixture to the patient. In 10 awake volunteers and 12 patients under N2O/halothane anaesthesia, it was demonstrated that a fresh gas flow from the anesthetic machine of 40 ml x kg-1 x min-1 is sufficient to prevent rebreathing during spontaneous respiration, when the venturi injector is included in the Magill attachment.

Re-evaluation of the Farman entrainer in a low-pressure system for field anaesthesia

“…They also reduced the FGF requirements of the Magill circuit by using the injector to entrain room air. 14 The Farrnan entrainer 9 is the prototype of the air entraining Venturi system. Farman designed his entrainer to convert the draw-over EMO system to a plenum system for paediatric anaesthesia.…”