A patient with a subarachnoid bolt has an intracranial pressure (ICP) reading of 22 mm Hg. The nurse records this measurement in the chart as which of the following?
A) Low
B) High
C) Insignificant
D) Normal
Ans: B
Feedback: Normal intracranial pressure is 10 to 20 mm Hg, measured in the lateral ventricles. A measurement of 22 mm Hg is significant. The volume and pressure of the three components in the cranial vault (brain tissue, flood, and cerebrospinal fluid (CSF) are usually in a state of equilibrium and produce the intracranial pressure. Without compensation of the cranial components, ICP begins to rise. ICP from any cause decreases cerebral perfusion, stimulates further swelling, and shifts brain tissue through openings of the rigid dura; this results in herniation, which is a dire, frequently fatal event.
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