During a temporizing hyperventilation in severe TBI, what PaCO2 target is used for a short duration?

During a temporizing hyperventilation in severe TBI, what PaCO2 target is used for a short duration?

• A. 40-45 mmHg
• B. 25-30 mmHg
• C. 30-35 mmHg
• D. 50-60 mmHg

Answer: (C)

Temporizing hyperventilation lowers intracranial pressure by reducing cerebral blood flow through cerebral vasoconstriction caused by lowering PaCO2. For a short duration in severe TBI, targeting a PaCO2 of about 30–35 mmHg provides quick ICP reduction while avoiding too deep hypocapnia, which can compromise cerebral perfusion. Going lower, such as 25–30 mmHg, increases the risk of cerebral ischemia, especially if autoregulation is impaired. Keeping it near 40–45 mmHg would not significantly lower ICP, and 50–60 mmHg would raise CO2 levels and promote vasodilation and higher ICP.

Temporizing hyperventilation lowers intracranial pressure by reducing cerebral blood flow through cerebral vasoconstriction caused by lowering PaCO2. For a short duration in severe TBI, targeting a PaCO2 of about 30–35 mmHg provides quick ICP reduction while avoiding too deep hypocapnia, which can compromise cerebral perfusion. Going lower, such as 25–30 mmHg, increases the risk of cerebral ischemia, especially if autoregulation is impaired. Keeping it near 40–45 mmHg would not significantly lower ICP, and 50–60 mmHg would raise CO2 levels and promote vasodilation and higher ICP.