Correct Answer: B

Rationale: Peeling skin on the hands and feet is a characteristic clinical manifestation of Kawasaki disease, known as desquamation. This occurs during the convalescent phase of the illness. While Kawasaki disease is associated with a high fever, which is a common early sign, and can also present with other symptoms like conjunctivitis, mucous membrane changes, and lymphadenopathy, the peeling skin on the hands and feet is a classic feature that distinguishes Kawasaki disease from other conditions. Generalized rash is not a specific hallmark of Kawasaki disease, and low-grade fever is not typically associated with this condition. Therefore, the correct answer is B, peeling skin on the hands and feet, which is a key feature of Kawasaki disease.

Correct Answer: B

Rationale: Rectal biopsy is the definitive diagnostic procedure for Hirschsprung disease in infants. This procedure reveals the absence of ganglion cells in the affected bowel segment, which is a hallmark of Hirschsprung disease. Colonoscopy (Choice A) is not typically used for diagnosing Hirschsprung disease due to the risk of not accurately reaching the affected segment. Multiple saline enemas (Choice C) are not used to confirm the diagnosis of Hirschsprung disease. Fiberoptic nasoenteric tube (Choice D) is not a standard diagnostic procedure for Hirschsprung disease and does not provide the necessary information to confirm the absence of ganglion cells in the affected bowel segment.

Correct Answer: B

Rationale: Encouraging deep breathing exercises is crucial preoperative teaching for a child scheduled for a tonsillectomy as it helps improve lung function and can prevent postoperative complications like pneumonia. Explaining the procedure in detail may heighten the child's anxiety, making it less ideal. While discussing hydration is important, it may not be the top priority for preoperative teaching for this specific procedure. Play therapy can reduce fear and anxiety, but encouraging deep breathing exercises directly contributes to better postoperative outcomes by enhancing respiratory function.

Correct Answer: A

Rationale: Seizures in children most often result from an abrupt rise in body temperature, leading to febrile seizures. Febrile seizures are common in young children and are typically triggered by a rapid increase in body temperature, often due to infections or other causes. An inflammatory process in the brain (Choice B) is less common as a cause of seizures in children and is usually associated with specific conditions like encephalitis or meningitis. While a temperature greater than 102°F (Choice C) may trigger a febrile seizure, it is the abrupt rise in temperature that is the primary cause. Choice D, a life-threatening infection, is a broad and less specific cause compared to the direct trigger of an abrupt rise in body temperature.

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.