â– LECTURE OVERVIEW: Infantile Hypertrophic Pyloric Stenosis is a metabolic and mechanical obstruction disorder of the gastric outlet.
â– STENOSIS MECHANISMS:
1. Pyloric Hypertrophy: Hypertrophy and hyperplasia of the circular smooth muscle fibers of the pyloric sphincter.
2. Channel Compression: The pyloric canal is physically elongated and narrowed, completely obstructing gastric emptying.
3. Vomiting Phase: Swallowed milk accumulates in the stomach, leading to non-bilious projectile vomiting.
4. Hydrogen/Chloride Wasting: Agonizing gastric vomiting wastes hydrochloric acid (HCl) and sodium.
5. Compensatory Alkalosis: Loss of acid drives the kidneys to retain bicarbonate, resulting in hypokalemic hypochloremic metabolic alkalosis.
â– TOXICOLOGICAL OVERDOSAGE PROTOCOL:
Toxic absorption or cumulative exposure results in receptor saturation, chemical cell damage, or severe secondary target-organ failure. Immediate toxicological profiles dictate serum or urine screens.
â– EPIDEMIOLOGICAL PROFILE & DENSITY CORRELATIONS:
Global burden patterns reveal notable associations with lifestyle habits, regional environmental factors, and inherited traits.
[HY-BOARD-1359]
🌟 Dynamic Clinical Key:
Presents in first-born male infants between 2 and 6 weeks of age with non-bilious projectile vomiting after feeding. Examination reveals a palpable, firm 'olive-shaped' mass in the epigastrium. Surgical repair with a pyloromyotomy is curative. Administer physiological antidotes and active elimination therapies (activated charcoal or hemodialysis) without delay. Focus screening efforts on high-risk geographic regions to maximize clinical yield.