What is the appropriate flow rate for oxygen delivery via nasal cannula?

The appropriate flow rate for oxygen delivery via nasal cannula is generally considered to be 1-6 liters per minute (Lpm). However, for the purpose of addressing the choice selected, 4-6 Lpm is often recommended as a range where most patients can comfortably receive supplemental oxygen through a nasal cannula while still providing an adequate concentration of oxygen.

At this flow rate, the patient receives a modest amount of oxygen, which can be particularly effective for those with mild to moderate respiratory distress or when you need to provide oxygen to a patient who does not require high flow rates. This level balances patient comfort and effective oxygenation.

It's important to note that higher flow rates, such as those provided in other choices, may not be appropriate with a nasal cannula as they can lead to discomfort or excessive drying of the mucous membranes in the nasal passages. Additionally, above 6 Lpm, the delivery becomes less effective because a significant portion of the oxygen may be lost to the surrounding air due to the anatomical limitations of the nasal passages. Thus, while a nasal cannula can be used at flow rates of less than 6 Lpm, the focus is on providing enough oxygen without compromising the patient's comfort or mucosal integrity.