(Select all that apply): A nurse is educating a group of patients about different oxygen delivery devices. Which of the following are examples of low-flow oxygen delivery systems?

Choice D rationale:

The nurse should connect the nasal cannula to a humidifier first. Dry and irritated nares are common side effects of oxygen therapy via nasal cannula, and using a humidifier adds moisture to the oxygen, reducing irritation and discomfort for the patient.

Choice A rationale:

Applying petroleum jelly to the nares is not the first action to take. It might provide temporary relief, but it is essential to address the root cause of dryness, which is the lack of moisture in the oxygen delivered.

Choice B rationale:

Increasing the flow rate of oxygen is not the first step because it may not address the dryness issue. It can lead to a higher concentration of oxygen, but it won't solve the problem of dry and irritated nares.

Choice C rationale:

Changing the nasal cannula to a face mask is not necessary to address the dryness. Face masks may not be well-tolerated by some patients, and it's better to try less invasive interventions first.

Choice A rationale:

At a flow rate of 4 L/min, oxygen therapy through a nasal cannula can increase the risk of oxygen toxicity, especially if used for prolonged periods. Oxygen toxicity can cause damage to the lungs and other organs.

Choice B rationale:

Carbon dioxide retention is not a common complication at this flow rate. It may occur in patients with severe chronic obstructive pulmonary disease (COPD) at higher oxygen flow rates.

Choice C rationale:

Nasal dryness is a common but relatively minor complication of oxygen therapy via nasal cannula. It can cause discomfort but is not a severe concern.

Choice D rationale:

Fire hazard is not directly related to the use of a nasal cannula but rather to the use of oxygen in the presence of flammable materials or near open flames. It is a concern for all oxygen delivery devices, not specific to nasal cannulas.