Which factor contributes to brain injury in the post-cardiac arrest period?

Which factor contributes to brain injury in the post-cardiac arrest period?

• A. Ischemia and Cerebral Edema
• B. Hypertension During Resuscitation
• C. Hyperthermia Unrelated to Arrest
• D. Hypoglycemia Alone

Answer: (A)

Brain injury after cardiac arrest is driven primarily by global ischemia during the arrest, followed by edema once circulation returns. The brain is starved of oxygen and glucose, causing energy failure, excitotoxic damage, and cell death. When blood flow is restored, this injury is amplified by reperfusion processes that promote swelling (cerebral edema), which raises intracranial pressure and further impairs cerebral perfusion. This combination—ischemic injury during the arrest plus edema after resuscitation—is the main contributor to brain injury in the post-arrest period. While factors like temperature, glucose, or blood pressure can influence outcomes, they do not establish the principal mechanism of injury in this context as clearly as ischemia with edema.

Brain injury after cardiac arrest is driven primarily by global ischemia during the arrest, followed by edema once circulation returns. The brain is starved of oxygen and glucose, causing energy failure, excitotoxic damage, and cell death. When blood flow is restored, this injury is amplified by reperfusion processes that promote swelling (cerebral edema), which raises intracranial pressure and further impairs cerebral perfusion. This combination—ischemic injury during the arrest plus edema after resuscitation—is the main contributor to brain injury in the post-arrest period. While factors like temperature, glucose, or blood pressure can influence outcomes, they do not establish the principal mechanism of injury in this context as clearly as ischemia with edema.