أي علامة تُعد من أوائل علامات نقص الأكسجين عند البالغ؟

Which is one of the earliest signs of hypoxia in an adult?

1. Cyanosis of the lips and extremities
2. Dilated pupils and unresponsiveness
3. New restlessness and anxiety
4. Bradycardia

Answer: C) New restlessness and anxiety. Restlessness, anxiety, confusion, tachycardia and tachypnoea are early signs. Cyanosis and bradycardia are late signs of severe hypoxia.