A client recovering from a head injury has a blood pressure of 158/90 mm Hg and an intracranial pressure reading of 17 mm Hg. What is this client's cerebral perfusion pressure?
What will be an ideal response?
35.6
Rationale: Cerebral perfusion pressure (CPP) is calculated by subtracting the intracranial pressure (ICP) from the MAP (MAP - ICP = CPP). Mean arterial pressure is calculated by the equation 1/3(SBP-DBP)+DBP = MAP. For this situation first calculate MAP: 1/3 (158-90) + 90 = 1/3 (158) = 52.6. Then use the equation MAP – ICP or 52.6 – 17 = 35.6.
Global Rationale: Cerebral perfusion pressure (CPP) is calculated by subtracting the intracranial pressure (ICP) from the MAP (MAP - ICP = CPP). Mean arterial pressure is calculated by the equation 1/3(SBP-DBP)+DBP = MAP. For this situation first calculate MAP: 1/3 (158-90) + 90 = 1/3 (158) = 52.6. Then use the equation MAP – ICP or 52.6 – 17 = 35.6.
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