The medical complication that led to the anoxic brain injury was a problem with the

• A. Endotracheal tube.
• B. Defibrillator.
• C. Intravenous line.
• D. Cast.

Answer: (B)

Anoxic brain injury happens when the brain is deprived of oxygen for enough time to cause damage. In an emergency like cardiac arrest, quickly restoring circulation is essential so that oxygenated blood keeps reaching the brain. The defibrillator is the device used to treat life-threatening heart rhythms by delivering a shock to restart a normal rhythm. If there’s a problem with the defibrillator—such as failing to deliver a needed shock or malfunctioning—the heart may not recover its rhythm promptly, leading to prolonged cerebral oxygen deprivation and brain injury.

The other options relate to different potential sources of hypoxia (airway problems with an endotracheal tube, issues from an IV line, or an immobility-related cast), but they do not address the immediate electrical management of a dangerous heart rhythm that, when faulty, can cause anoxic brain injury.