Manifestations of acute brain ischemia (Cushing reflex)are due primarily to
A) parasympathetic nervous system activation.
B) sympathetic nervous system activation.
C) autoregulation of body systems.
D) loss of brainstem reflexes.

Question

Quizplus · Accepted Answer

An extreme increase in ICP can precipitate an intense reaction by the sympathetic nervous system as it attempts to maintain cerebral perfusion through the compressed blood vessels.This has been termed an ischemic response or Cushing reflex.Manifestations of acute brain ischemia are because of sympathetic nervous system activation.The sympathetic nervous system activates to attempt to lower the intracranial pressure accompanied by acute brain ischemia.The Cushing reflex generally is viewed as a "last-ditch" effort by the brain to reestablish cerebral perfusion but is not as a result of loss of brainstem reflexes.

Manifestations of Acute Brain Ischemia (Cushing Reflex)are Due Primarily to