Calculate CPP given ICP 34 and BP 108/64.

Calculate CPP given ICP 34 and BP 108/64.

• A. 40 mm Hg
• B. 45 mm Hg
• C. 60 mm Hg
• D. 55 mm Hg

Answer: (B)

Cerebral perfusion pressure is the pressure driving blood flow to the brain, calculated as cerebral MAP minus intracranial pressure. Use MAP ≈ (SBP + 2×DBP)/3. With a BP of 108/64, MAP ≈ (108 + 2×64)/3 = (108 + 128)/3 = 236/3 ≈ 79 mmHg. Then CPP ≈ 79 − 34 = 45 mmHg. So the CPP is about 45 mmHg. Clinically, this level suggests reduced cerebral perfusion, since CPP often aims to be around 60–70 mmHg to ensure adequate brain blood flow. The given numbers don’t support a higher CPP; they reflect the result of the calculation from these values.

Cerebral perfusion pressure is the pressure driving blood flow to the brain, calculated as cerebral MAP minus intracranial pressure. Use MAP ≈ (SBP + 2×DBP)/3. With a BP of 108/64, MAP ≈ (108 + 2×64)/3 = (108 + 128)/3 = 236/3 ≈ 79 mmHg. Then CPP ≈ 79 − 34 = 45 mmHg. So the CPP is about 45 mmHg. Clinically, this level suggests reduced cerebral perfusion, since CPP often aims to be around 60–70 mmHg to ensure adequate brain blood flow. The given numbers don’t support a higher CPP; they reflect the result of the calculation from these values.