Pediatric HESI Practice Questions

Correct Answer: D

Rationale: The varicella vaccine is specifically designed to prevent chickenpox. Measles, mumps, and rubella are prevented by different vaccines: Measles is prevented by the measles, mumps, and rubella (MMR) vaccine; Mumps is prevented by the MMR vaccine; and Rubella is also prevented by the MMR vaccine. Therefore, the correct answer is D, Chickenpox, as it is the disease prevented by the varicella vaccine.

Correct Answer: C

Rationale: The correct answer is C. Infants receive passive immunity through antibodies from the mother during pregnancy and breastfeeding, which protect them initially. Choice A is incorrect because a 6-week-old infant born without an immune system would not be able to limit exposure to pathogens effectively. Choice B is incorrect as antibodies produced by colonic bacteria are not a significant source of immunity in infants. Choice D is incorrect as the fetal thymus primarily plays a role in T cell development rather than antibody production during gestation.

Correct Answer: D

Rationale: The correct answer is 'Low-grade fever.' A low-grade fever is a typical, mild side effect that can occur after the Hib vaccine is administered. It is a sign that the body's immune system is responding to the vaccine and is generally not a cause for concern. Lethargy, urticaria, and generalized rash are not commonly associated side effects of the Hib vaccine. Lethargy may be a sign of other issues, while urticaria and generalized rash are more indicative of allergic reactions rather than typical responses to the Hib vaccine.

Correct Answer: A

Rationale: Incisors are the teeth that typically erupt first in infants, usually around 6 months of age. These teeth play a crucial role in biting and cutting food. Canines, upper molars, and lower molars are not the primary teeth to erupt in infants. Canines usually erupt after incisors, while molars, whether upper or lower, come in later during the teething process.

Correct Answer: B

Rationale: Establishing a bedtime routine is the most appropriate suggestion for a parent seeking help with a child experiencing night terrors. Bedtime routines can create a sense of security and predictability for the child, potentially reducing the frequency of night terrors. Encouraging the child to talk about the night terrors (Choice A) may not be effective during the episode as the child is usually not fully awake. Allowing the child to sleep with the parents (Choice C) may inadvertently reinforce the behavior and hinder the child's ability to learn to self-soothe. Waking the child during the night (Choice D) may disrupt the sleep cycle and exacerbate the night terrors.