Which of the following oxygen delivery devices provides the most precise and consistent fraction of inspired oxygen (FiO2) regardless of the patient's breathing pattern?

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.

Choice A rationale:

The nurse should instruct the patient to avoid smoking or being near open flames while using oxygen. Oxygen supports combustion, and smoking or exposure to flames can lead to a fire hazard.

Choice C rationale:

Checking the position of the oxygen delivery device frequently is important to ensure proper oxygen delivery and avoid any displacement or obstruction that may compromise the therapy's effectiveness.

Choice D rationale:

Instructing the patient to report any signs of hypoxia (low oxygen levels) or hypercarbia (high carbon dioxide levels) to the provider is crucial for early detection of potential complications and appropriate management.

Choice E rationale:

Instructing the patient to adjust the flow rate of oxygen as needed allows them to respond to varying oxygen requirements, especially during activities or changes in their respiratory condition.

Choice B rationale:

Using cotton or wool clothing and bedding is not a recommended instruction for oxygen therapy. Synthetic materials are preferred as they are less likely to catch fire compared to cotton or wool.