Correct Answer: C

Rationale: Positioning the client in semi-Fowler's with the knees flexed is the most appropriate action to promote comfort in a client with acute low back pain. This position helps alleviate low back pain by reducing the pressure on the spine and supporting its natural curvature. Ambulating with a walker could strain the back, performing abdominal curls may exacerbate the pain, and straight leg raises while lying supine could cause further discomfort. Therefore, only positioning the client in semi-Fowler's with the knees flexed is the correct choice for promoting comfort in this scenario.

Correct Answer: A

Rationale: To calculate the rate: (1000 ml / 4 hours) = 250 ml/hour; (250 ml/hour) / (60 minutes/hour) = 4.17 ml/minute; (4.17 ml/minute) * (10 gtt/ml) = 41.7 gtt/minute, rounded to 42 gtt/minute. Therefore, the nurse should regulate the infusion at 42 gtt/minute to deliver the prescribed fluid challenge accurately. The other choices are incorrect as they do not reflect the correct calculation based on the given information.

Correct Answer: C

Rationale: Vomiting is a common sign of digitalis toxicity and should be closely monitored. While tachycardia is a common sign of heart failure, it is not typically associated with digitalis toxicity (Choice A). Dyspnea (Choice B) and muscle cramps (Choice D) are not specific signs of digitalis toxicity and can be present in other conditions. Therefore, the presence of vomiting should raise concerns about digitalis toxicity in the child with heart failure.

Correct Answer: A

Rationale: Blowing cool air from a hair dryer under the cast is a safe method to relieve itching without damaging the cast or causing injury. The air helps to dry out the moisture that is causing the itching. Twisting the cast back and forth (choice B) can create pressure points and discomfort for the child. Shaking powder into the cast (choice C) can introduce foreign material that may cause skin irritation. Pushing a pencil under the cast edge (choice D) can injure the child's skin or even dislodge the cast.

Correct Answer: B

Rationale: Advising the client to maintain a voiding diary is the appropriate action in this case. A voiding diary helps track symptoms and patterns essential for diagnosing conditions like benign prostatic hyperplasia or other urinary issues. Palpating the client's suprapubic area for distention (Choice A) may provide information about bladder fullness but does not address the need for tracking symptoms. Instructing the client in techniques for cleansing the glans penis (Choice C) is not relevant to the client's urinary complaints. Obtaining a urine specimen for culture and sensitivity (Choice D) may be necessary but does not directly address the client's symptoms of weak urine flow and difficulty initiating the urine stream.