Pyloric Stenosis

Infantile hypertrophic pyloric stenosis is thickening of the pyloric muscle, narrowing the outlet from the stomach to the duodenum. The resulting gastric outlet obstruction causes progressive, forceful, non-bilious vomiting after feeds; the infant may remain hungry because little milk has reached the intestine. It most commonly presents between 2 and 12 weeks of age. RN priorities follow the physiology: recognize the vomiting pattern, assess hydration and weight, identify the expected electrolyte disturbance, keep the infant NPO as ordered, restore fluid and electrolyte balance, and prepare for Ramstedt pyloromyotomy after metabolic stabilization. Persistent vomiting, dehydration, or metabolic alkalosis requires urgent admission and transfer to a pediatric surgical centre.