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Figure 17-6
A, Average distribution
of ventilation-perfusion ratios (V̇A/
)
in normal young semirecumbent subjects. The 95% range covers from 0.3 to 2.1 (between
dashed lines). B,
Corresponding variations in PO2
and PCO2
in alveolar gas. (Redrawn from West JB: Blood flow to the lung and gas
exchange. Anesthesiology 41:124, 1974.)
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