In ICP management, what is the effect of elevating the head of the bed to 30 degrees?

• A. Reduces cerebral perfusion pressure
• B. Improves venous drainage from the brain
• C. Causes neck stiffness
• D. Increases ICP

Answer: (B)

Elevating the head of the bed to about 30 degrees uses gravity to improve venous outflow from the brain. This reduces cerebral venous pressure and cerebral blood volume, which lowers intracranial pressure. Because cerebral perfusion pressure is mean arterial pressure minus intracranial pressure, lowering ICP while keeping MAP stable tends to maintain or even improve CPP. So this position helps ICP management by enhancing drainage rather than increasing ICP or reducing perfusion. It’s not about neck stiffness, and it does not raise ICP.