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Figure 71-8
Relationship between cardiac index and arterial oxygenation
with shunt fractions (QVA
/QT
) ranging from 5% to 30%. With
large intrapulmonary shunts, a small drop in cardiac index results in a large fall
in arterial oxygenation. (Redrawn from Philbin DM, Sullivan SF, Bowman FO,
et al: Postoperative hypoxemia. Contribution of cardiac output. Anesthesiology
32:136, 1970.)
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