A client must use a non-rebreathing oxygen mask. Which of the following statements is true regarding this type of mask?

Correct Answer: A

Rationale: A non-rebreather mask is used for supplemental oxygen delivery for clients experiencing breathing difficulties. The non-rebreather mask includes a one-way valve that allows exhaled air to escape, preventing the rebreathing of carbon dioxide. The client inhales oxygenated air from a reservoir bag attached to the mask, providing high-concentration oxygen therapy. A non-rebreather mask can deliver FiO2 levels of up to 90%, making it an effective intervention for clients requiring high oxygen concentrations. Therefore, the statement that 'A non-rebreather can provide an FiO2 of 40%' is correct. Choices B, C, and D are incorrect because clients should breathe through their nose and mouth, the mask offers a reservoir for inhaling oxygen, and the mask should be assessed and potentially replaced if soiled or damaged, not routinely changed every 3 hours.

Correct Answer: C

Rationale: The correct answer is 'Water loss is greater than electrolyte loss.' In hypertonic dehydration, there is a higher loss of water compared to electrolytes, leading to elevated concentrations of electrolytes in the body. This condition is characterized by plasma sodium levels above 150 mEq/L. As water moves from the extracellular space to the intracellular space, it results in cellular dehydration. Choice A is incorrect because the plasma sodium levels associated with hypertonic dehydration are typically above 150 mEq/L, not between 130 and 150 mEq/L. Choice B is incorrect as fluid moves from the extracellular space to the intracellular space in hypertonic dehydration. Choice D is incorrect because physical signs and symptoms may not always be grossly apparent in hypertonic dehydration.

Correct Answer: A

Rationale: The key to preventing a pandemic influenza is early detection. Detecting influenza cases early allows for timely public health responses to limit the spread of the virus. Early detection helps in implementing measures such as isolation, treatment, and vaccination to prevent the development of a full-blown pandemic. Antibiotics are not effective against influenza viruses, so early antibiotic treatment is not the key to prevention. While vaccination of at-risk populations is important in controlling the spread of influenza, early detection is crucial as it allows for timely implementation of vaccination strategies. Isolation of suspected cases is a containment measure rather than a prevention strategy; the key to prevention lies in early detection to stop the spread before it becomes a pandemic.

Correct Answer: D

Rationale: The nurse should recommend isometric exercises for the muscles of the casted extremity. Isometric exercises involve contracting and relaxing muscles without moving the affected part. This type of exercise helps maintain muscle strength without moving the joint, which is important for clients with immobilized extremities. Range of motion exercises involve moving the joint through its full range of motion, which may not be suitable for a client with a long leg cast. Aerobic exercises focus on increasing cardiovascular endurance and may not be appropriate for a client with a casted extremity. Isotonic exercises involve muscle contractions with movement, which may not be safe for the affected extremity in a cast.

Correct Answer: A

Rationale: The correct answer is "High Fowler's" position. Sitting in a chair or resting in a bed in a high Fowler's position decreases the cardiac workload and facilitates breathing. This position helps reduce the work of breathing and promotes optimal lung expansion, making it easier for the client to breathe. Supine position (choice B) is lying flat on the back and may not be ideal for clients with congestive heart failure as it can increase pressure on the heart. Left lateral position (choice C) is commonly used for promoting circulation in clients with certain conditions but is not the most appropriate for congestive heart failure. Low Fowler's position (choice D) is not recommended as it does not provide the same benefits in terms of reducing cardiac workload and easing breathing as the high Fowler's position.