A client with a head injury begins to report worsening symptoms. Which finding should the nurse recognize as an early sign of increased intracranial pressure (ICP)?

A ruptured cerebral aneurysm causes acute subarachnoid hemorrhage with sudden arterial bleeding into the subarachnoid space. This results in rapid intracranial pressure elevation, meningeal irritation, and focal neurological deficits due to disrupted cerebral perfusion and cranial nerve compression.

Rationale:

A. Light sensitivity occurs due to meningeal irritation from blood in the subarachnoid space. This triggers photophobia commonly seen in subarachnoid hemorrhage. The inflammatory response around meninges increases sensory nerve irritation leading to intolerance of bright light exposure.

B. Loss of consciousness occurs due to abrupt rise in intracranial pressure and decreased cerebral perfusion. A ruptured aneurysm can cause sudden global cerebral hypoperfusion, leading to syncope or coma depending on hemorrhage severity and brainstem involvement.

C. A dilated pupil indicates cranial nerve III compression from expanding hematoma or herniation. Oculomotor nerve dysfunction disrupts parasympathetic control of pupil constriction, producing unilateral mydriasis and suggesting impending transtentorial herniation, a neurosurgical emergency.

D. Visual disturbances occur from increased intracranial pressure and optic pathway involvement. Compression or ischemia of visual cortex or optic nerves leads to blurred vision, diplopia, or transient vision loss depending on hemorrhage location and severity.

E. Nausea and vomiting result from stimulation of the medullary vomiting center due to elevated intracranial pressure. Increased pressure disrupts normal brainstem function and is a common early sign of acute intracranial pathology including aneurysmal rupture.

F. Numbness on one side of the face reflects focal cranial nerve involvement or cortical sensory pathway disruption. A ruptured aneurysm may compress trigeminal pathways or cause localized ischemia leading to unilateral facial sensory deficits and neurological asymmetry.

Increased intracranial pressure involves rising intra-cranial volume, reduced cerebral perfusion pressure, impaired neuronal oxygenation, and progressive brain tissue compression. Early recognition is essential to prevent secondary brain injury, herniation syndromes, and irreversible neurologic deterioration in clients with head trauma.

Rationale:

A. Coma is a late and severe manifestation of increased intracranial pressure indicating significant cerebral dysfunction and brainstem involvement. It reflects advanced neurologic deterioration rather than an early warning sign. Loss of consciousness and profound cerebral depression occur in later stages of intracranial hypertension.

B. Headache is an early and common sign of increased intracranial pressure due to stretching of pain-sensitive intracranial structures such as dura mater and blood vessels. It often precedes more severe neurologic changes. Increased intracranial tension and reduced cerebral compliance contribute to persistent headache symptoms.

C. Fixed pupils indicate severe brainstem compression and are a late and life-threatening sign of increased intracranial pressure. This finding suggests impending herniation and requires emergency intervention. It reflects loss of cranial nerve function and advanced brainstem compromise.

D. Posturing (decorticate or decerebrate) is a late neurologic sign indicating severe brain injury and brainstem involvement. It represents significant disruption of motor pathways and increased intracranial pressure progression. Abnormal motor response patterns and severe neurologic impairment occur at advanced stages of intracranial hypertension.