What oxygen flow rate is recommended when managing syncope?

• A. 5 litres per minute
• B. 15 litres per minute
• C. 8 litres per minute
• D. 2 litres per minute

Answer: (B)

During syncope, the priority is to rapidly provide high-concentration oxygen to prevent cerebral hypoxia as perfusion returns to normal. Delivering oxygen through a non-rebreathing mask at a high flow, about 15 litres per minute, achieves near‑maximal oxygen delivery (high FiO2) even if the patient’s breathing is shallow or irregular. Lower flow rates, whether via nasal cannula or simple masks, deliver significantly less oxygen and may not adequately support oxygenation during this event. If breathing ceases or airway management is needed, a bag‑valve mask with high-flow oxygen should be used to ensure saturations are maintained.