Which sign is commonly associated with increased intracranial pressure?

Which sign is commonly associated with increased intracranial pressure?

• A. Pupil changes
• B. Hypernatremia
• C. Hypothermia
• D. Normal gait

Answer: (A)

Pupil changes are the most direct reflection of rising intracranial pressure because swelling or a mass effect can compress the oculomotor nerve as it travels near the brainstem. When this nerve is compressed, the parasympathetic fibers that constrict the pupil are inhibited, leading to a dilated pupil on the affected side that may be slow to react or nonreactive to light. Because this focal effect on a cranial nerve is an early and readily observable sign of increased ICP, it serves as a reliable bedside indicator and prompt cue for urgent assessment and intervention. Hypernatremia is an electrolyte imbalance, not a direct sign of ICP rise; hypothermia is a systemic response that can occur after brain injury but isn’t specific to intracranial pressure; a normal gait suggests no clear motor deficit and does not indicate elevated ICP.

Pupil changes are the most direct reflection of rising intracranial pressure because swelling or a mass effect can compress the oculomotor nerve as it travels near the brainstem. When this nerve is compressed, the parasympathetic fibers that constrict the pupil are inhibited, leading to a dilated pupil on the affected side that may be slow to react or nonreactive to light. Because this focal effect on a cranial nerve is an early and readily observable sign of increased ICP, it serves as a reliable bedside indicator and prompt cue for urgent assessment and intervention.

Hypernatremia is an electrolyte imbalance, not a direct sign of ICP rise; hypothermia is a systemic response that can occur after brain injury but isn’t specific to intracranial pressure; a normal gait suggests no clear motor deficit and does not indicate elevated ICP.