What symptoms should a nurse expect in a 6-week-old infant admitted for evaluation of suspected pyloric stenosis?

Choice A rationale Projectile vomiting is a common symptom in infants with pyloric stenosis. This is due to the narrowing of the pylorus, the muscular valve at the bottom of the stomach, which prevents breast milk or formula from passing through to the small intestine. Choice B rationale Effortless regurgitation is not typically associated with pyloric stenosis. The hallmark symptom of pyloric stenosis is projectile vomiting. Choice C rationale Metabolic acidosis is not a typical symptom of pyloric stenosis. The hallmark symptom of pyloric stenosis is projectile vomiting. Choice D rationale While a distended abdomen can occur in some cases of pyloric stenosis, it is not the most common symptom. The hallmark symptom of pyloric stenosis is projectile vomiting.