What is the Cushing reflex and what does it signal in TBI?

What is the Cushing reflex and what does it signal in TBI?

• A. Hypertension, bradycardia, and irregular respirations; signals increased intracranial pressure and potential brain herniation.
• B. Tachycardia and hypotension.
• C. Normal vital signs.
• D. Fever and tachypnea.

Answer: (A)

The Cushing reflex is the brain’s late, brainstem-driven response to rising intracranial pressure in traumatic brain injury. When ICP climbs, cerebral perfusion pressure falls, prompting the body to raise systemic blood pressure in an attempt to maintain blood flow to the brain. This hypertension with a widened pulse pressure is accompanied by a reflex bradycardia from baroreceptor input, and the brainstem disturbance causes irregular, often gasping or erratic respirations. Together, these signs form the Cushing triad and signal that ICP is dangerously high and brain herniation risk is imminent, requiring urgent efforts to reduce ICP and protect the brain. The other patterns described don’t reflect this late, brainstem-mediated response.

The Cushing reflex is the brain’s late, brainstem-driven response to rising intracranial pressure in traumatic brain injury. When ICP climbs, cerebral perfusion pressure falls, prompting the body to raise systemic blood pressure in an attempt to maintain blood flow to the brain. This hypertension with a widened pulse pressure is accompanied by a reflex bradycardia from baroreceptor input, and the brainstem disturbance causes irregular, often gasping or erratic respirations. Together, these signs form the Cushing triad and signal that ICP is dangerously high and brain herniation risk is imminent, requiring urgent efforts to reduce ICP and protect the brain. The other patterns described don’t reflect this late, brainstem-mediated response.