Which statement is true regarding intracranial pressure (ICP)?
a. Increased ICP allows increased cerebral cortex perfusion.
b. A normal adult ICP reading is from 5 to 8 mm Hg.
c. Manual blood pressure readings determine accurate ICP readings.
d. A ventricular catheter is the most accurate method of monitoring ICP.
ANS: D
ICP rises with an increase in volume of the brain, cerebrospinal fluid (CSF), and/or cerebral blood supply or with decompensation. In adults, normal ICP ranges from 10 to 20 mm Hg. When an abnormal elevation is sustained, ICP prevents adequate perfusion of the cerebral cortex. ICP monitoring is accomplished by implanting a ventricular catheter, subarachnoid screw, or epidural sensor. Insertion of a ventricular catheter is an invasive procedure but the most accurate method of ICP monitoring.
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