While caring for a patient with a traumatic brain injury, the nurse assesses an ICP of 20 mm Hg and a CPP of 85 mm Hg. What is the best interpretation by the nurse?

Rationale: A. ICP is high: CPP is normal is correct because normal intracranial pressure (ICP) is 5–15 mm Hg. An ICP of 20 mm Hg indicates elevated intracranial pressure, which can compromise cerebral perfusion if it rises further. Cerebral perfusion pressure (CPP) is calculated as MAP – ICP, with normal values between 60–100 mm Hg. A CPP of 85 mm Hg is within normal range, indicating adequate cerebral perfusion despite elevated ICP. The priority is to monitor ICP closely and implement measures to prevent further increases. B. Both pressures are low is incorrect because the CPP is within normal limits, and only the ICP is elevated. Low CPP (100 mm Hg) is rare and usually a result of extreme hypertension or aggressive therapy.