Why is preventing hypotension crucial in resuscitation for moderate-severe TBI?

• A. It maintains cerebral perfusion pressure and cerebral oxygen delivery
• B. It reduces the risk of infection
• C. It prevents seizures
• D. It accelerates wound healing

Answer: (A)

In moderate to severe TBI, preventing hypotension is essential because the brain’s blood flow needs to stay steady to avoid secondary injury after the initial trauma. Cerebral perfusion pressure, which drives blood flow to the brain, is roughly the difference between mean arterial pressure and intracranial pressure. If blood pressure falls, CPP drops, and when intracranial pressure is already high, the brain can become underperfused. With impaired autoregulation after injury, the brain can’t compensate, so lower systemic pressure means less blood reaching brain tissue and less oxygen delivered where it’s most needed. Keeping blood pressure from dropping helps maintain CPP and cerebral oxygen delivery, reducing the risk of further brain injury. The other aims—reducing infection, preventing seizures, or speeding wound healing—are important but do not address the immediate need to preserve brain perfusion and oxygen delivery during resuscitation.