Increased Intracranial Pressure: Early Signs and Care

Medical-Surgical · Neurology·Updated 2026-10-28

What it is

The skull is a closed box holding brain tissue, blood and cerebrospinal fluid; when one volume increases, another must decrease or intracranial pressure (ICP) rises (Monro-Kellie doctrine). As ICP rises, cerebral perfusion pressure (CPP = mean arterial pressure minus ICP) falls, the brain becomes ischemic, and tissue eventually herniates. Nursing care therefore lowers ICP and protects CPP: head position and venous drainage, oxygenation and normal CO2, and avoiding anything that raises intrathoracic or intra-abdominal pressure.

What the NCLEX focuses on

A change in level of consciousness (restlessness, irritability, new confusion or drowsiness) is the earliest and most sensitive sign.
Late signs: Cushing triad (rising systolic pressure with a widening pulse pressure, bradycardia, irregular respirations), a fixed dilated pupil and abnormal posturing.
A unilateral dilated, sluggish or nonreactive pupil signals oculomotor nerve (CN III) compression on the same side.
Glasgow Coma Scale: 15 is normal and 8 or less is severe, requiring airway protection; a drop of 2 points is reported immediately.
Decorticate posturing (flexion) that changes to decerebrate posturing (extension) means brainstem involvement and a worse prognosis.
Mannitol is working when urine output rises and consciousness improves; monitor serum osmolality, electrolytes and for fluid overload (crackles) as fluid shifts into the vascular space.
ICP rises with hypoxemia, hypercapnia, fever, coughing, straining, suctioning, neck flexion or rotation, sharp hip flexion, clustered care, pain and seizures.

Priority nursing actions

Maintain the airway and oxygenation; keep PaCO2 in the normal range and avoid routine hyperventilation.
Elevate the head of the bed 30 degrees with the head and neck midline, and avoid sharp hip flexion.
Perform serial neurologic checks (GCS, pupils, motor response, vital signs) against baseline and report any decline immediately.
Give prescribed osmotic therapy (mannitol or hypertonic saline) and monitor intake and output, serum sodium and osmolality.
Prevent ICP spikes: space care activities, suction only when needed, give stool softeners, treat fever and pain, and keep the room quiet.

Numbers to know

Value	Normal or target	Why it matters
ICP	5 to 15 mm Hg; treat when sustained above 20 mm Hg	Sustained elevation reduces cerebral blood flow
CPP	At least 60 mm Hg	Below 50 mm Hg causes ischemia and neuronal death
Glasgow Coma Scale	15 normal; 8 or less severe	A score of 8 or less requires airway protection
Head of bed	30 degrees with the neck midline	Promotes venous drainage from the brain
Suctioning	Preoxygenate with 100% oxygen; each pass 10 seconds or less	Hypoxemia and coughing raise ICP
PaCO2	35 to 45 mm Hg (4.7 to 6.0 kPa)	Hypercapnia dilates cerebral vessels and raises ICP

Common exam traps

Choosing Trendelenburg or a flat position: wrong because it impedes venous drainage from the brain and raises ICP.
Choosing to cluster care activities back to back: wrong because each activity raises ICP; space them so pressure returns to baseline.
Choosing hourly vigorous coughing and deep breathing: wrong because coughing raises intrathoracic pressure and ICP.
Choosing to wait for vital sign changes before reporting new restlessness: wrong because Cushing triad is a late sign; the change in consciousness is the cue to act.
Choosing a large pillow that flexes the neck for comfort: wrong because neck flexion obstructs jugular venous outflow.

What to teach

Family: keep visits calm and the room quiet, and avoid upsetting conversation at the bedside.
Awake client: avoid straining at stool, holding the breath and bending at the waist; exhale when turning or moving up in bed.
After discharge for a head injury: return at once for worsening headache, repeated vomiting, increasing drowsiness, unequal pupils, a seizure or clear drainage from the nose or ear.

Try 2 NCLEX-style questions on this topic

From the NCLEXPace question bank. Pick your answers, then check them inside NCLEXPace.

Question 1 · QID 0CF0E92C

During hourly checks on a client with a traumatic brain injury, the nurse finds the right pupil is now 6 mm and does not react to light; the left is 3 mm and brisk. The client is increasingly difficult to arouse. Which interpretation is correct?

Select the best answer.

A. Possible oculomotor nerve compression from increasing intracranial pressure requires emergency evaluation
B. The client is entering deeper sleep, causing temporary asymmetric pupillary responses and reduced arousal during nighttime neurologic checks
C. The opioid analgesic is producing an exaggerated unilateral pupillary response along with expected sedation from pain treatment
D. The anisocoria most likely reflects normal baseline pupil asymmetry that has become more noticeable as the client becomes fatigued

Question 2 · QID A984B84A

Which nursing interventions are appropriate for a client with increased intracranial pressure? Select all that apply.

A. Space nursing care activities apart rather than clustering them
B. Encourage vigorous coughing and deep breathing every hour
C. Position with the neck flexed for comfort
D. Preoxygenate and limit suctioning to brief passes only when needed
E. Administer prescribed stool softeners
F. Keep the room quiet with lighting dimmed

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Sources

Harding MM, Kwong J, Hagler D, Reinisch C. Lewis's Medical-Surgical Nursing: Assessment and Management of Clinical Problems. 12th ed. Elsevier; 2023; Chapter: Acute Intracranial Problems.
Carney N, Totten AM, O'Reilly C, et al. Guidelines for the Management of Severe Traumatic Brain Injury, Fourth Edition. Neurosurgery. 2017;80(1):6-15.

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