Correct Answer: A

Rationale: Infection is the leading cause of shock in infants and children due to their heightened vulnerability to sepsis. Infants and children possess developing immune systems, rendering them more susceptible to infections that can progress to septic shock. While cardiac failure is a severe condition, it is not as commonly the primary cause of shock in this age group. Accidental poisoning, though a potential shock inducer, is less prevalent in infants and children compared to infections. Severe allergic reactions, though significant, are not as frequent as infections in precipitating shock in infants and children.

Correct Answer: D

Rationale: The correct answer is D: surgical removal of the affected section of bowel. Hirschsprung disease is characterized by a segment of the colon lacking nerve cells, leading to obstruction. The definitive treatment involves surgically removing the affected segment, followed by a pull-through procedure to restore normal bowel continuity. Daily enemas (choice A) are not the primary treatment for Hirschsprung disease. While dietary adjustments may be advised, a low-fiber diet (choice B) alone is not curative for this condition. A permanent colostomy (choice C) is considered a last resort if surgical interventions fail or in severe cases, but it is not the initial therapeutic approach for managing Hirschsprung disease.

Correct Answer: B

Rationale: When a limb is protruding from the vagina during active labor, the appropriate management includes positioning the mother in a head-down position with her hips elevated. This position helps relieve pressure on the umbilical cord, reducing the risk of compromising fetal blood flow and oxygenation. Administering oxygen is essential to maintain oxygenation levels for both the mother and the fetus. Providing transport to a healthcare facility equipped to manage this obstetric emergency is crucial for ensuring a safe delivery. Choice A is incorrect because a semi-Fowler's position does not effectively relieve pressure on the umbilical cord. Choice C is incorrect as applying traction to the protruding limb can lead to injury or complications for both the mother and the fetus. Choice D is incorrect because attempting to manipulate the limb without proper positioning and preparation can worsen the situation and increase risks during delivery.

Correct Answer: A

Rationale: The correct intervention for a sprained ankle is to apply ice for 20 minutes every hour for the first 24 hours, then remove for 60 minutes to prevent tissue damage. This regimen helps reduce swelling and pain. Bed rest with the leg elevated for an extended period (36 hours) may lead to stiffness and decreased range of motion. While NSAIDs can be used for pain, they may not be necessary if pain is manageable with ice and rest. Using a compression dressing for 72 hours continuously may impede proper circulation and delay healing by restricting blood flow.

Correct Answer: C

Rationale: The correct answer is C. Infants may have difficulty regulating glucose and electrolytes due to their immature endocrine systems. This can lead to issues such as hypoglycemia and electrolyte imbalances. Choice A is incorrect because endocrine glands actually begin developing early in gestation, not just in the third trimester. Choice B is incorrect as endocrine glands are not fully functional at birth; they continue to mature and develop after birth. Choice D is incorrect as a child's endocrine system has a significant impact on growth and development through the secretion of hormones that regulate various processes in the body, but it does not specifically address the difficulty in regulating glucose and electrolytes seen in infants.