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Figure 36-3
Arterial PO2
as a function of FIO2
and shunt fraction
(
S/T).
Assumptions are shown on the upper left of the graph. The presence of a shunt decreases
arterial PO2
for a given FIO2
.
As S/T
increases, supplemental O2
has progressively less effect on arterial PO2
.
(Adapted from Benumof JL: Anesthesia for Thoracic Surgery, 2nd ed. Philadelphia,
WB Saunders, 1995, and Lawler PGP, Nunn JF: A reassessment of the validity of the
iso-shunt graph. Br J Anaesth 56:1325, 1984.)
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