A 28-year-old man with severe traumatic brain injury is being managed in the ICU. His mean arterial pressure is 95 mmHg and intracranial pressure measured by parenchymal monitor is 22 mmHg. According to Brain Trauma Foundation guidelines, what should be done?
- A Induce hypothermia to 33 degrees Celsius
- B Hyperventilate to a PaCO2 of 25 mmHg to reduce intracranial pressure
- C No intervention, as cerebral perfusion pressure is above the recommended threshold ✓
- D Treat the raised intracranial pressure to bring cerebral perfusion pressure into the 60 to 70 mmHg range
Explanation
Cerebral perfusion pressure equals mean arterial pressure minus intracranial pressure, here 95 minus 22, giving 73 mmHg. Guidelines recommend avoiding aggressive attempts to push CPP above about 70 mmHg because aggressive fluids and pressors cause adult respiratory distress syndrome without brain benefit, while keeping CPP above roughly 60 mmHg. Since this patient exceeds that range, no intervention is needed. Hyperventilation to PaCO2 of 25 mmHg causes cerebral vasoconstriction and ischaemia and is reserved for impending herniation, and prophylactic hypothermia has shown no mortality benefit.
Reference: Brain Trauma Foundation Guidelines for the Management of Severe Traumatic Brain Injury, 4th ed.
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