Which of the following devices is best suited to deliver 65% oxygen to a patient who is spontaneously breathing?
a. Face mask with non-rebreathing reservoir
b. Low-flow nasal cannula
c. Simple face mask
d. Venturi mask
A
Face masks with reservoirs (partial rebreathing and non-rebreathing reservoir masks) provide oxygen concentration of 60% or higher. The addition of the reservoir increases the amount of oxygen available to the patient during inspiration and allows for the delivery of concentrations of 35% to 60% (partial rebreather) or 60% to 80% (non-rebreather) depending on the flowmeter setting, the fit of the mask, and the patient's respiratory pattern. The high-flow nasal cannula, not the traditional low-flow models, can provide higher flows. The simple face mask can deliver flows up to 60%. The Venturi mask allows better regulation of oxygen concentration and generally does not deliver more than 60% oxygen.
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