A nurse is caring for a client who is receiving oxygen therapy via a nasal cannula. How should the nurse explain to the client how this method of oxygen delivery performs?
Delivers a low concentration of oxygen.
Delivers a constant rate of oxygen.
Delivers a high concentration of oxygen.
Delivers a constant flow of a specific concentration of oxygen.
The Correct Answer is D
Choice A Reason:
“Delivers a low concentration of oxygen” is incorrect because a nasal cannula can deliver varying concentrations of oxygen depending on the flow rate set by the healthcare provider. The concentration can range from low to moderate, typically between 24% to 44%.
Choice B Reason:
“Delivers a constant rate of oxygen” is partially correct but not entirely accurate. While the flow rate can be constant, the key aspect is the specific concentration of oxygen delivered, which is more relevant to the client’s understanding.
Choice C Reason:
“Delivers a high concentration of oxygen” is incorrect because nasal cannulas are generally used for low to moderate oxygen delivery. High concentrations of oxygen are typically delivered through other devices like non-rebreather masks or high-flow nasal cannulas.
Choice D Reason:
“Delivers a constant flow of a specific concentration of oxygen” is correct. This explanation accurately describes how a nasal cannula works. It provides a continuous flow of oxygen at a specific concentration, which is adjusted based on the client’s needs and the healthcare provider’s prescription.

Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A Reason:
Repeating auscultation after asking the client to take a deep breath and cough is the first intervention the nurse should take. This action helps to clear any secretions or mucus that might be causing the crackles. If the crackles persist after the client coughs, it indicates that the sounds are likely due to fluid in the lungs, which requires further assessment and intervention. This step ensures that the nurse accurately identifies the cause of the crackles before proceeding with other interventions.
Choice B Reason:
Instructing the client to limit fluid intake to less than 2,000 mL/day might be appropriate in cases of fluid overload or heart failure, but it is not the first intervention. The nurse needs to confirm the cause of the crackles before making any recommendations about fluid intake. Limiting fluid intake without proper assessment could lead to dehydration and other complications.
Choice C Reason:
Placing the client on bed rest in semi-Fowler’s position can help improve lung expansion and oxygenation by reducing pressure on the diaphragm. However, this is not the first intervention. The nurse should first determine if the crackles are due to secretions that can be cleared by coughing. Semi-Fowler’s position is beneficial for patients with respiratory distress, but it does not address the immediate need to reassess lung sounds.
Choice D Reason:
Preparing to administer antibiotics is not the first intervention. Antibiotics are used to treat infections, and the nurse needs to confirm whether the crackles are due to an infection or another cause before administering medication. Immediate administration of antibiotics without proper assessment could lead to inappropriate treatment and antibiotic resistance.
Correct Answer is C
Explanation
Choice A reason: Cover
Covering a wound with slough is not an appropriate intervention. Slough is a type of necrotic tissue that can impede the healing process by providing a medium for bacterial growth and preventing the formation of healthy granulation tissue. Simply covering the wound without addressing the slough can lead to infection and delayed healing.
Choice B reason: Clean
Cleaning the wound is a necessary step in wound care, but it is not sufficient on its own to address the presence of slough. While cleaning can help reduce the bacterial load and remove some debris, it does not effectively remove the slough itself. Slough often requires more targeted interventions such as debridement to be effectively managed.
Choice C reason: Debride
Debridement is the most appropriate intervention for a wound with slough. Debridement involves the removal of necrotic tissue, including slough, to promote a clean wound bed and facilitate the healing process. There are several methods of debridement, including autolytic, enzymatic, mechanical, and surgical, each with its own indications and benefits. Removing the slough allows for better assessment of the wound and promotes the formation of healthy granulation tissue.
Choice D reason: Leave Alone
Leaving a wound with slough alone is not advisable. Slough can harbor bacteria and impede the healing process, leading to chronic wounds and potential infection. Without intervention, the wound is unlikely to progress through the normal stages of healing.
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