The nurse obtains these assessment findings for a patient who has a head injury. Which finding should be reported rapidly to the health care provider?

a. Urine output of 800 mL in the last hour
b. Intracranial pressure of 16 mm Hg when patient is turned
c. Ventriculostomy drains 10 mL of cerebrospinal fluid per hour
d. LICOX brain tissue oxygenation catheter shows PbtO2 of 38 mm Hg