What percentage of oxygen is recommended to be delivered through a bag mask?

Delivering 100% oxygen at a flow rate of 15 L/min through a bag-mask ventilation device is recommended to ensure that the patient receives the highest possible fraction of inspired oxygen (FiO2). This is especially important in critical care settings, where patients may be experiencing respiratory failure or other life-threatening conditions that necessitate optimal oxygenation.

Using this approach maximizes the oxygen concentration in the air being delivered, which is crucial for supporting patients who may not be able to adequately oxygenate themselves. In emergencies, providing a high concentration of oxygen can help improve arterial oxygen saturation and support vital organ function while further interventions, such as intubation or advanced respiratory support, are considered. The specific flow rate of 15 L/min helps ensure a proper seal with the mask while providing sufficient volume to improve ventilation efficiency.

Other options suggest lower concentrations of oxygen or inadequate flow rates, which may not meet the immediate respiratory needs of critically ill patients.