1. Preoxygenation: a comparison of three different breathing systems
J. Hirsch, I. Führer, P. Kuhly, W. Schaffartzik 
British Journal of Anaesthesia 
Volume 87, Issue 6, Pages (December 2001)
DOI: /bja/
Copyright © 2001 British Journal of Anaesthesia Terms and Conditions

2. Fig 1
On the left, the tubing system fitted with a 3.5 litre reservoir bag is shown. The valves in the inspiratory and expiratory branches create a unidirectional gas flow. Preoxygenation with the NasOral system was performed as shown with the inspiratory branch in position A. Using the face mask or mouthpiece, the tubing was connected as indicated in position B. The connector consisted of a standard Y-piece and a filter and had a volume of about 30 ml. By connecting a mouthpiece with a nose-clip, a face mask and a NasOral system (as shown on the right) to this tubing system, the efficacy of the three devices was compared.
British Journal of Anaesthesia  , DOI: ( /bja/ )
Copyright © 2001 British Journal of Anaesthesia Terms and Conditions