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. Author manuscript; available in PMC: 2014 Dec 1.
Published in final edited form as: Respir Physiol Neurobiol. 2013 Aug 11;189(3):10.1016/j.resp.2013.07.027. doi: 10.1016/j.resp.2013.07.027

Figure 12.

Figure 12

Relationship between V̇A/Q̇ heterogeneity and efficiency of gas exchange. Left: A V̇A/Q̇distribution for a single animal at the smallest piece size without volume normalization. The width of the V̇A/Q̇ distribution on a log scale is one measure of V̇A/Q̇ heterogeneity. The traditional measure has been the logSD(V̇A/Q̇). Right: Using the A-aO2 difference as a measure of gas exchange efficiency in the 5 rats, there is a modest relationship between the A-aO2 difference and the logSD(V̇A/Q̇) within each animal. The V̇A/Q̇ lack of a stronger relationship is discussed below.