Correct Answer: C

Rationale: Proper perineal hygiene, including cleansing with water after voiding, is crucial in preventing UTIs in young girls. Avoiding public toilets and limiting baths are less effective than proper hygiene practices.

Correct Answer: B

Rationale: The peak age for the onset of minimal change nephrotic syndrome (MCNS) is typically between 4 and 5 years old. MCNS is the most common cause of nephrotic syndrome in children, particularly within this age range.

Correct Answer: C

Rationale: The correct answer is C because the PCA pump can be programmed to deliver a continuous basal rate of pain medication to maintain pain control. While the goal of PCA is effective pain relief, it does not guarantee a pain-free state. In the case of a 5-year-old child, the parents or nurse can administer boluses if necessary since the child may not fully comprehend using the PCA button. Monitoring every 1 to 2 hours for patient response is adequate and there is no need for monitoring every 15 minutes, as stated in choice D, unless specific circumstances dictate more frequent monitoring.

Correct Answer: C

Rationale: Severe dehydration is the most common cause of acute renal failure in children, as it leads to prerenal azotemia, which can progress to renal failure if not corrected. Other causes like pyelonephritis and tubular destruction are less common and usually secondary to other conditions.

Correct Answer: A

Rationale: Physiologic manifestations of pain may vary considerably, so they do not provide a consistent measure of pain. Heart rate may increase or decrease. The same signs that may suggest fear, anxiety, or anger also indicate pain. In chronic pain, the body adapts, and these signs decrease or stabilize. Physiologic measurements are of limited value and must be viewed in the context of a pain rating scale, behavioral assessment, and parental report. When the child reports pain on an appropriate pain scale, the appropriate interventions should be used. Therefore, physiologic measurements are not considered a reliable standalone indicator for pain in children, making choice A the correct answer. Choice B is incorrect because physiologic measurements alone do not serve as the best indicator of pain. Choice C is incorrect as physiologic measurements are still limited even when children report pain. Choice D is incorrect as physiologic measurements are not primarily used to determine the truthfulness of a child's pain report.