Correct Answer: B

Rationale: The correct instruction the nurse should include when teaching a client about using a metered-dose inhaler (MDI) is to hold the inhaler 1-2 inches from the mouth. This distance ensures proper delivery of the medication into the airways. Choices A, C, and D are incorrect because inhaling for a specific duration, exhaling immediately after inhaling, or holding the inhaler directly at the lips are not recommended practices for the correct use of an MDI.

Correct Answer: B

Rationale: The correct answer is to 'Wear shoes at all times.' This instruction is crucial for preventing foot injuries in clients with diabetes mellitus. Wearing shoes protects the feet from potential injuries and reduces the risk of developing foot ulcers. Cutting toenails straight across (not in a rounded shape) helps prevent ingrown toenails. Applying lotion between the toes can create a moist environment, increasing the risk of fungal infections. Soaking feet in hot water daily can lead to dry skin and potentially cause burns, which is not recommended for individuals with diabetes.

Correct Answer: B

Rationale: The correct answer is B: Increased hematocrit. Increased hematocrit indicates hemoconcentration, which is a sign of fluid volume deficit. When there is a decrease in fluid volume in the body, the blood becomes more concentrated, leading to an increase in hematocrit levels. Choices A, C, and D are incorrect because decreased BUN levels, increased white blood cell count, and decreased hematocrit are not indicative of fluid volume deficit.

Correct Answer: C

Rationale: The correct answer is C: 'Use a special mattress to reduce pressure on the skin.' This intervention is crucial in preventing skin breakdown in clients with limited mobility as it helps to reduce pressure on bony prominences. Repositioning every 4 hours (Choice A) is important but may not be sufficient to prevent skin breakdown entirely. Applying lotion every 2 hours (Choice B) may not address the root cause of skin breakdown related to pressure. Increasing fluid intake (Choice D) is beneficial for overall skin health but may not directly prevent skin breakdown caused by pressure points.

Correct Answer: B

Rationale: The correct answer is B: Bladder distention. Bladder distention is a sign of catheter occlusion because it indicates a failure to drain urine properly. Bladder spasms (Choice A) are more commonly associated with bladder irritability rather than catheter occlusion. Frequent urination (Choice C) is unlikely in a client with an indwelling catheter as the urine should be draining continuously. Hematuria (Choice D) refers to blood in the urine and is not typically a direct sign of catheter occlusion.