A nurse at a pediatric hotline receives a call from a mother who plans to administer aspirin to a toddler for a fever and wants to know the dosage.

Which of the following statements by the nurse is an appropriate response?

Choice A rationale:
Abdominal rigidity and pain on palpation are not typical signs of pyloric stenosis. Pyloric stenosis usually presents with non-bilious projectile vomiting, a palpable olive-shaped mass in the upper abdomen, and signs of dehydration.
Choice B rationale:
A rounded abdomen and hypoactive bowel sounds are characteristic signs of pyloric stenosis. The hypertrophied pyloric muscle obstructs the passage of food from the stomach to the duodenum, leading to gastric distention, visible peristalsis, and vomiting. The infant may appear hungry after vomiting and will continue to feed, leading to weight loss.
Choice C rationale:
Visible peristalsis and weight loss are consistent with pyloric stenosis. The visible peristalsis occurs as the infant tries to force the stomach contents through the narrowed pyloric sphincter. Weight loss is a result of poor feeding and vomiting.
Choice D rationale:
Distention of the lower abdomen and constipation are not typical findings in pyloric stenosis. Constipation suggests a lower gastrointestinal issue, while pyloric stenosis primarily affects the upper gastrointestinal tract.

Choice A rationale
Shingles, also known as herpes zoster, is a viral infection that causes a painful rash and is caused by the varicella-zoster virus, the same virus that causes chickenpox.
Choice B rationale
Tinea pedis is a foot infection due to a dermatophyte fungus. It is the most common dermatophyte infection and is particularly prevalent in hot, tropical, urban environments. Interdigital involvement is most commonly seen (this presentation is also known as athlete’s foot, although some people use the term for any kind of tinea pedis).
Choice C rationale
Fever blister, also known as cold sores, are caused by the herpes simplex virus. They are small, fluid-filled blisters that develop on the lips or around the mouth.
Choice D rationale
Pinworms are a type of parasite that lives in the lower intestine of humans. They are tiny, narrow worms. They are white and less than a half-inch long.