What is the correct delivery device and flow rate for a person who has collapsed suddenly and is receiving compression-only CPR?

In a scenario where a person has collapsed suddenly and is receiving compression-only CPR, the appropriate delivery device for supplemental oxygen is a CPR mask with an oxygen inlet set to the highest available flow rate.

Using a CPR mask allows for a more effective delivery of oxygen directly to the lungs, especially during a critical situation where the patient is unresponsive and not breathing adequately. By attaching the mask to an oxygen source and setting it to the highest flow rate, it ensures that the maximum amount of oxygen is available, enhancing the chances of providing adequate oxygenation until advanced medical help arrives.

This method is particularly deemed suitable for emergencies where time is of the essence and immediate action is necessary to support the victim's breathing and improve the chances of survival. Other methods, such as nasal cannulas or simple masks, may not provide sufficient oxygen delivery or could be less effective in these urgent circumstances.