Which findings constitute the Cushing triad indicating late-stage intracranial hypertension?

• A. Hypertension, bradycardia, irregular respirations
• B. Hypotension, tachycardia, hyperventilation
• C. Fever, neck stiffness, photophobia
• D. Hypothermia, apnea, mydriasis

Answer: (A)

Understanding this question starts with recognizing the Cushing triad, a late sign of intracranial hypertension. As intracranial pressure climbs, cerebral perfusion pressure falls. In response, the body raises systemic blood pressure to try to maintain cerebral blood flow, producing hypertension with a widened pulse pressure. The increased ICP also stimulates a reflex vagal response that slows the heart, causing bradycardia. Meanwhile, brainstem compression disrupts normal respiratory control, leading to irregular respirations. Together, these three findings point to dangerous ICP elevation and potential brain herniation.

This combination is the hallmark of the Cushing triad, which is why it’s the best answer. The other symptom clusters correspond to different conditions (for example, fever with neck stiffness suggests meningitis; hypotension with tachycardia and hyperventilation can occur with shock or metabolic disturbances; hypothermia with apnea and mydriasis isn’t the classic triad for ICP), so they don’t fit the scenario of late-stage intracranial hypertension.