When a patient's intracranial pressure (ICP) is being monitored with an intraventricular catheter, which information obtained by the nurse is most important to communicate to the health care provider?

a. Oral temperature 101.6° F
b. Apical pulse 102 beats/min
c. Intracranial pressure 15 mm Hg
d. Mean arterial pressure 90 mm Hg