Which finding most strongly suggests early hypoxemia in a hospitalized adult?

• A. Restlessness and agitation.
• B. Confusion and headache.
• C. Hypotension with bradycardia.
• D. Jaundice and fever.

Answer: (A)

Early hypoxemia most strongly affects the brain, and neurons are highly sensitive to reduced oxygen. When arterial oxygen is low, cerebral oxygen delivery drops, triggering increased sympathetic activity and a distressed, unsettled mental state. Restlessness and agitation are the earliest neurobehavioral signs you’ll see in an adult with declining oxygenation, making them the best clue among these options. Confusion and headache can develop as hypoxemia worsens, but they’re not as immediate or specific to the initial oxygen drop. Hypotension with bradycardia isn’t typical in early hypoxemia and suggests more severe instability or a different issue. Jaundice and fever don’t reflect oxygenation status at all and point toward hepatic, infectious, or inflammatory processes. Recognizing restlessness and agitation promptly guides timely assessment and intervention to improve oxygenation.