Question

What is the cerebral perfusion pressure (CPP) if BP is 90/60 and ICP is 18?
1. 48 mmHg
2. 65 mmHg
3. 52 mmHg
4. 30 mmHg

Answer 1

Correct Answer - Option 3 : 52 mmHg

Concept:

• Cerebral perfusion pressure (CPP) refers to the pressure that drives cerebral blood flow to the brain. This blood flow provides oxygen to the brain.
• Cerebral perfusion pressure is the pressure gradient.
• It is opposed by two forces mean arterial pressure (MAP) and intracranial pressure (ICP).

Therefore, CPP = MAP - ICP

Explanation:

• MAP is calculated by the formula of diastolic pressure (DBP) + 1/3{Systolic pressure (SBP) – diastolic pressure (DBP)}
• DBP = 60 mmhg SBP = 90 mmhg
• MAP =  60 + (90 - 60)/3
• MAP = 180 + 30/3 = 70
• CPP = MAP - ICP {ICP = 18}
• CPP = 70 - 18 = 52 mmhg