1. Efficient Breathing Circuit for Use at Altitude
Kyle T.S. Pattinson, FRCA, Ron B. Somogyi, BSc, Joseph A. Fisher, MD, FRCP(C), Arthur R. Bradwell, FRCP 
Wilderness & Environmental Medicine 
Volume 16, Issue 2, Pages (June 2005)
DOI: /PR
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2. Figure 1
Changes in parameters in the patient with acute mountain sickness while under treatment with the Fisher circuit. a, Ambient air. b, Reduced ambient air entry with rebreathing. c, 500mL·min−1 of oxygen. d, 1.2L·min−1 of oxygen.
Wilderness & Environmental Medicine  , DOI: ( /PR )
Copyright © 2005 Wilderness Medical Society Terms and Conditions

3. Figure 2
The Fisher high-altitude breathing circuit (components not to scale).
Wilderness & Environmental Medicine  , DOI: ( /PR )
Copyright © 2005 Wilderness Medical Society Terms and Conditions