The patient is suspected of having a new brain tumor. Which test will the nurse expect to be ordered to detect a small tumor?

Surgical removal of an encapsulated acoustic tumor (vestibular schwannoma) carries a high risk for neurological complications due to its location near the brainstem and cranial nerves. Key postoperative risks include increased intracranial pressure (ICP), hydrocephalus, and seizures, which require close monitoring for early intervention.

Rationale for correct answers:

A. Increased intracranial pressure (ICP): Swelling or CSF accumulation after brain surgery can elevate ICP, leading to headache, vomiting, or altered consciousness. Prompt recognition is vital to prevent brain herniation.

C. Hydrocephalus: Obstruction of CSF pathways during surgery can cause hydrocephalus with headache, nausea, and mental status changes. Ventricular drainage may be required to relieve pressure.

E. Seizures: Brain tissue irritation or postoperative edema can trigger seizures. Clients are often placed on prophylactic anticonvulsants to minimize this risk.

Rationale for incorrect answers:
B. Hemorrhagic shock: This surgery rarely causes systemic blood loss severe enough to induce shock because it is localized to the brain. Shock would be an unusual and late complication.
D. Hypoglycemia: This is not a typical postoperative risk unless the client has comorbid diabetes or inadequate perioperative glucose management.

Take home points

• Major postoperative risks are neurologic: ICP increase, hydrocephalus, and seizures.
• Hemorrhagic shock and hypoglycemia are uncommon in acoustic tumor removal.
• Early recognition of neurologic changes is essential for preventing complications.

Increased intracranial pressure (ICP) occurs when the volume of brain tissue, blood, or cerebrospinal fluid rises within the rigid skull. This condition leads to impaired cerebral perfusion, which can quickly progress to brain herniation if unaddressed. Early recognition of signs and symptoms is critical for preventing permanent neurological damage. Common early findings include changes in mental status, behavioral changes, headache, and pupil abnormalities, which reflect pressure on brain tissue and cranial nerves.

Rationale for correct answers:

A. Disoriented to time and place: Confusion and disorientation are early indicators of cerebral hypoperfusion. They reflect rising ICP affecting the cerebral cortex.

B. Restlessness and irritability: These are early behavioral changes caused by decreased cerebral oxygenation and pressure on brain tissue. They often precede more severe neurological deterioration.

C. Unequal pupils: Indicates pressure on cranial nerve III or brain herniation risk. Pupil asymmetry is a critical neurologic warning sign.

E. Headache: A common manifestation of stretching meninges and pressure changes. It often worsens with coughing, straining, or position changes.

Rationale for incorrect answer:
D. ICP 15 mmHg: Normal ICP ranges from 10–15 mmHg, so 15 is at the upper limit but not elevated. Clinically significant ICP is typically >20 mmHg.

Take home points

• Early signs of ICP increase include confusion, restlessness, headache, and pupil changes.
• Unequal pupils are an emergency indicator of possible herniation.
• ICP is considered elevated above 20 mmHg, requiring prompt intervention.