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What will be the cerebral perfusion pressure(CPP) if a client with a head injury is being monitored for increased intracranial pressure (ICP), his blood pressure being 90/60 mmHG and the ICP being 18 mmHg?



A. 52 mm Hg
B. 88 mm Hg
C. 48 mm Hg
D. 68 mm Hg

This question is part of Increased Intracranial Pressure (ICP) by RNpedia.com
Asked by RN pedia, Last updated: Jan 16, 2020

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2 Answers

F. Ray

F. Ray, Student, Kansas City

Answered Dec 26, 2018

I don’t know if the previous answer was given by someone who is studying to be a nurse or happens to know a lot about this subject, but it makes sense to me. My research has shown that the formula for this is correct; you take the MAP (or mean arterial pressure) and subtract the ICP (or intracranial pressure) to find the cerebral perfusion pressure.

This is an important thing to calculate correctly. If the CCP is too low, the brain may not be getting enough oxygen. If it’s too high, the brain could be under too much pressure. Our brains are fragile things, and it’s best not to mess with their natural environment if possible. However, sometimes, it can’t be helped due to injuries.

 

John Smith

John Smith

Answered Apr 25, 2017

52 mm Hg

CPP is derived by subtracting the ICP from the mean arterial pressure (MAP). For adequate cerebral perfusion to take place, the minimum goal is 70 mmHg. The MAP is derived using the following formula: MAP = ((diastolic blood pressure x 2) + systolic blood pressure) / 3 MAP = ((60 x2) + 90) / 3 MAP = 70 mmHg To find the CPP, subtract the clients ICP from the MAP; in this case , 70 mmHg 18 mmHg = 52 mmHg.
 

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