extent of lung collapse and fluid accumulation if findings from chest x-rays are uncertain; helpful in identifying loculated (saclike) collection of blood

Arterial blood

PaO2: 80-100 mm Hg;

Hypoxemia; PaO2 < 80 mm

Determine adequacy of


PaCO2: 35-45 mm Hg;

Hg; SaO2 < 95%; PaCO2

oxygenation; accumulation

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