رجل عمره ٤٥ سنة وُجد في غرفة مغلقة بها مدفأة فحم في ليلة باردة، ويشتكي صداعاً شديداً وغثياناً وتشوشاً، وزوجته عندها نفس الأعراض. لونه وردي، والنبض ١١٠، وقراءة جهاز التشبع ٩٩٪. ما التصرف الصحيح؟

A 45-year-old man was found in a closed room with a charcoal heater on a cold night, with severe headache, nausea and confusion; his wife has the same symptoms. He looks pink, HR 110, and pulse oximetry reads 99%. What is the correct action?

1. Reassure him because the saturation is normal and give analgesia
2. 100% oxygen by non-rebreather and a carboxyhaemoglobin level
3. Give 2 L oxygen by nasal cannula only
4. Wait for blood results before any oxygen

Answer: B) 100% oxygen by non-rebreather and a carboxyhaemoglobin level. In carbon monoxide poisoning a standard oximeter reads carboxyhaemoglobin as oxygen, giving a falsely normal value. Treatment is immediate 100% oxygen and measuring carboxyhaemoglobin on a blood gas.