Flutter valve assembly in mask piece stops patient’s
exhaled air from returning to reservoir bag
• Delivers oxygen concentrations up to and above 95 percent
• Flow rate must be adequate to keep reservoir bag partly inflated
during inspiration
• Paramedics should ensure that mask is seated firmly over patient’s
mouth and nose
• Ensure reservoir bag is never less than 2/3 full
• Most often used in patients who need high‐concentration oxygen
delivery (10 to 15 L/min)
• Should not be used in patients with apnea or poor
respiratory effo