a 1 month old infant is admitted to the pediatric unit with a tentative diagnosis of hirschsprung disease congenital aganglionic megacolon what proced
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HESI Pediatrics Quizlet

1. How is the diagnosis of Hirschsprung disease confirmed in a 1-month-old infant admitted to the pediatric unit?

Correct answer: B

Rationale: Rectal biopsy is the definitive diagnostic procedure for Hirschsprung disease in infants. It confirms the absence of ganglion cells in the affected bowel segment, which is characteristic of Hirschsprung disease. Colonoscopy (Choice A) is not typically used for confirmation as it may not provide a definitive result. Multiple saline enemas (Choice C) are utilized in the treatment of meconium ileus, a complication of cystic fibrosis, and not in the diagnosis of Hirschsprung disease. Fiberoptic nasoenteric tube (Choice D) is not a diagnostic tool for Hirschsprung disease; it is commonly used for gastrointestinal decompression or feeding purposes but does not confirm the diagnosis.

2. A healthcare provider is assessing a child with suspected bacterial meningitis. What is a common clinical manifestation that the provider is likely to observe?

Correct answer: D

Rationale: A common clinical manifestation of bacterial meningitis is a positive Kernig sign, which indicates meningeal irritation. Kernig sign is elicited when the leg is bent at the hip and knee at 90-degree angles, and pain and resistance are felt with extension at the knee due to inflamed meninges. Options A, B, and C are not typically associated with bacterial meningitis. A rash is more commonly seen in viral illnesses, photophobia can be present but is not specific to bacterial meningitis, and jaundice is not a typical clinical manifestation of this condition.

3. A 6-month-old infant is diagnosed with cystic fibrosis. What explanation should the nurse provide to the parents about this condition?

Correct answer: A

Rationale: The correct answer is A: 'It is a condition affecting the respiratory and digestive systems.' Cystic fibrosis is a genetic disorder that primarily affects the respiratory and digestive systems. It is caused by a defective gene that leads to the production of thick and sticky mucus in these organs. This mucus can clog airways in the lungs and block the ducts in the pancreas, affecting digestion. Choice B is incorrect because cystic fibrosis is not an autoimmune disorder; it is a genetic condition. Choice C is partially correct in that cystic fibrosis is a genetic disorder, but merely managing it with medication oversimplifies the comprehensive care needed for individuals with cystic fibrosis. Choice D is incorrect as cystic fibrosis is not caused by prenatal exposure to toxins but is a genetic condition inherited from parents.

4. In an adolescent suspected of having type 1 diabetes mellitus, which clinical manifestation may be present?

Correct answer: D

Rationale: Poor wound healing is a common clinical manifestation of type 1 diabetes mellitus. Elevated blood glucose levels in diabetes can lead to impaired wound healing by affecting various cellular processes involved in the healing cascade. Moist skin (Choice A) is not typically associated with type 1 diabetes mellitus. Weight gain (Choice B) is more commonly seen in type 2 diabetes due to insulin resistance. Fluid overload (Choice C) is not a typical clinical manifestation of type 1 diabetes mellitus. Therefore, the correct answer is poor wound healing.

5. The instructor is educating a group of students about myelination in a child. Which statement by the students indicates that the teaching was successful?

Correct answer: B

Rationale: The correct answer is B. Myelination occurs in a cephalocaudal (head-to-toe) pattern, improving nerve function progressively. Choice A is incorrect because myelination continues beyond 4 years of age and into adolescence. Choice C is incorrect as myelination speeds up nerve impulses rather than slowing them down. Choice D is incorrect because myelination increases the specificity and efficiency of nerve impulses, making them more focused and precise.

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