Which reflex is defined by hypertension, bradycardia, and an altered respiratory pattern in response to increased intracranial pressure?

• A. Cushing's reflex
• B. Herniation syndrome
• C. Subarachnoid hemorrhage
• D. Epidural hematoma

Answer: (A)

When intracranial pressure rises, the body tries to preserve blood flow to the brain by a compensatory reflex. This response increases systemic blood pressure to help drive blood through the now-tense cranial vessels, while the baroreceptors react to that high pressure by slowing the heart rate. The brainstem centers that regulate breathing become stressed or disrupted by the pressure, leading to an altered (often irregular or apneic) breathing pattern. This combination of hypertension, bradycardia, and changed respiration is the classic Cushing response, signaling dangerous ICP levels and the possibility of imminent brain herniation, so it demands urgent attention to reduce ICP.

Other options describe conditions or consequences related to increased ICP but do not define this reflex pattern. Herniation syndrome is the process that can result from very high ICP, subarachnoid hemorrhage and epidural hematoma are specific pathologies that can cause ICP elevation, but they don’t name the reflex itself.