Which term is described as 'Narrowing of pylorus causing projectile vomiting'?

• A. Pyloric Stenosis
• B. RSV
• C. Croup
• D. Epiglottitis

Answer: (A)

Hypertrophic pyloric stenosis. This condition occurs when the pyloric muscle thickens and narrows the passage from the stomach into the duodenum, creating a gastric outlet obstruction that leads to nonbilious, often projectile vomiting after feeds. Because the obstruction is before the bile ducts enter the intestine, vomiting typically has no bile. You may also notice a small, firm olive-shaped mass in the upper-right abdomen and visible stomach peristalsis. Persistent vomiting with dehydration can cause a hypochloremic, hypokalemic metabolic alkalosis. The other terms describe respiratory illnesses (viral infections or airway inflammation) and do not involve the pylorus or gastric outlet obstruction.