1. The effect of bi-level positive airway pressure mechanical ventilation on gas exchange during general anaesthesia 
Yu G , Yang K , Baker A.B. , Young I  
British Journal of Anaesthesia 
Volume 96, Issue 4, Pages (April 2006)
DOI: /bja/ael033
Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

2. Fig 1 One-way valve system and connections.
British Journal of Anaesthesia  , DOI: ( /bja/ael033)
Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

3. Fig 2
Valve for collecting exhaled gas. (a) Inspiration; (b) expiration.
British Journal of Anaesthesia  , DOI: ( /bja/ael033)
Copyright © 2006 British Journal of Anaesthesia Terms and Conditions

4. Fig 3
Distribution of ventilation (V) and blood flow (Q) against ventilation–perfusion ratio (V/Q) on a logarithmic scale in two patients when awake, for BiPAP ventilation, and for IPPV with and without PEEP
British Journal of Anaesthesia  , DOI: ( /bja/ael033)
Copyright © 2006 British Journal of Anaesthesia Terms and Conditions