A CPP of 50 mm Hg indicates which condition regarding brain blood flow?

A CPP of 50 mm Hg indicates which condition regarding brain blood flow?

• A. Normal brain blood flow
• B. High brain blood flow
• C. Impaired brain blood flow
• D. Adequate cerebral perfusion

Answer: (C)

Cerebral perfusion pressure shows the driving force for blood flow to the brain. It’s calculated as mean arterial pressure minus intracranial pressure, and normal CPP is roughly 60–100 mm Hg. A CPP of 50 mm Hg falls below that normal range, so cerebral blood flow is not adequate. The brain can autoregulate within a limited range, but at this low level perfusion is impaired, increasing the risk of ischemia. In practice, clinicians aim to keep CPP above about 60 mm Hg to ensure adequate cerebral perfusion.

Cerebral perfusion pressure shows the driving force for blood flow to the brain. It’s calculated as mean arterial pressure minus intracranial pressure, and normal CPP is roughly 60–100 mm Hg. A CPP of 50 mm Hg falls below that normal range, so cerebral blood flow is not adequate. The brain can autoregulate within a limited range, but at this low level perfusion is impaired, increasing the risk of ischemia. In practice, clinicians aim to keep CPP above about 60 mm Hg to ensure adequate cerebral perfusion.