Question
What is the most common cause of gastric outlet obstruction in a 4-week-old baby?
The correct answer is
Congenital hypertrophic pyloric stenosis
Gastric Outlet Obstruction in Infants
Gastric outlet obstruction (GOO) refers to a blockage at the final part of the stomach (pylorus) or the beginning of the duodenum. Identifying the cause is crucial, especially in young infants.
Identifying the Most Common Cause in a 4-Week-Old
For a 4-week-old baby presenting with symptoms of gastric outlet obstruction, the most frequent diagnosis is Congenital hypertrophic pyloric stenosis.
- Condition: This condition involves a progressive thickening of the pyloric sphincter muscle, located between the stomach and the small intestine.
- Age Group: Symptoms typically emerge between 2 weeks and 2 months of age, making a 4-week-old infant a classic presentation age.
- Result: The enlarged muscle obstructs the passage of food from the stomach, leading to characteristic forceful or projectile vomiting.
Evaluating Other Options
Other potential causes of obstruction are less common in this specific age group compared to pyloric stenosis:
- Duodenal Atresia: This is a congenital absence or blockage of the duodenum. While it causes obstruction, it often presents earlier and more severely than typical CHPS.
- Annular Pancreas: This rare anomaly involves pancreatic tissue encircling the duodenum. It is a less common cause of obstruction than CHPS.
- Foreign Body: It is highly unlikely for a 4-week-old infant to ingest a foreign body causing obstruction.
Given the typical age of presentation and prevalence, Congenital hypertrophic pyloric stenosis is the most common cause of gastric outlet obstruction in a 4-week-old baby.
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