Wilderness Medical Society snowmass 2005 Page 112
Colin Grissom, M.D. "New Hope For Surviving the Avalanche"
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6
Figure 2. Curves of individual respiratory parameters in subjects breathing with a tight
fitting face mask connected to respiratory tubing running into one or two liter volume air
pockets in dense snow (n=28). The X-axis represents time in minutes. Some subjects did
not complete the 30 minutes of the study secondary to dyspnea or hypoxia. Panel a
shows arterial oxygen saturation as measured by a digital pulse oximeter (SpO2 %) on
the left Y-axis (continuous line) and fraction of inspired oxygen (O2 %) on the right Y-
axis (dotted line). Panel b shows partial pressure of end-tidal carbon dioxide (ETCO2)
(kPa) on the left Y-axis (continuous line) and fraction of inspired carbon dioxide (FICO2
%) on the right Y-axis (dotted line). (From reference
8
).
