AANP Family Nurse Practitioner (FNP) Certification Practice Exam

Non-bilious vomiting is a hallmark symptom of pyloric stenosis, particularly in infants. This condition is characterized by a narrowing of the pylorus—the opening from the stomach into the small intestine. As a result, the food that is ingested cannot pass easily into the intestine, leading to projectile vomiting after feedings. The vomitus does not contain bile because the obstruction occurs before the bile duct entry, making it non-bilious.

Infants with pyloric stenosis often appear hungry and may want to feed again shortly after vomiting. The persistent vomiting can also lead to signs of dehydration and electrolyte imbalances, which may warrant urgent medical attention. Recognizing this symptom early is crucial for management and treatment, which typically involves surgical intervention to correct the pyloric obstruction.

In contrast, symptoms such as abdominal pain, diarrhea, and fever are less directly associated with pyloric stenosis and may suggest other gastrointestinal conditions or infections. Understanding the specific symptomatology of pyloric stenosis helps in differentiating it from other potential causes of vomiting in infants.