During hypoxemia, agitation may occur due to which change?

• A. Renal dysfunction
• B. Neurological changes
• C. Muscular fatigue
• D. Hyperglycemia

Answer: (B)

When blood oxygen is low, the brain’s oxygen supply drops and neurons start to fail their energy needs. The brain is highly sensitive to hypoxia, so cerebral hypoxia disrupts neural activity and often presents as agitation, restlessness, or irritability. This neurological change is the most direct and immediate result of hypoxemia, making agitation a classic sign of cerebral oxygen deficit. Renal dysfunction, muscular fatigue, and hyperglycemia can cause problems too, but they do not explain the immediate behavioral and cognitive changes that occur with reduced brain oxygen delivery.