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When evaluating an ABG from a client with a subdural hematoma, the nurse notes the PaCO2 is 30 mm Hg. Which of the following responses best describes this result?

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Correct Answer:
Appropriate; lowering carbon dioxide (CO2) reduces intracranial pressure (ICP).
Description:
A normal PaCO2 value is 35 to 45 mm Hg. CO2 has vasodilating properties; therefore, lowering PaCO2 through hyperventilation will lower ICP caused by dilated cerebral vessels.Option B: Oxygenation is evaluated through PaO2 and oxygen saturation. Option D: Alveolar hypoventilation would be reflected in an increased PaCO2.
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