PAEA Surgery End Of Rotation (EOR) Practice Exam

Which demographic is most commonly affected by pyloric stenosis?

1. Firstborn males

2. Female infants

3. Secondborn males

4. Firstborn females

The correct answer is: Firstborn males

Pyloric stenosis is predominantly observed in firstborn males. This condition occurs when the pylorus, the opening from the stomach into the small intestine, becomes narrowed, leading to obstruction. Statistically, males are affected more frequently than females, with a ratio of about 3:1. Additionally, the association with being a firstborn suggests a genetic or environmental factor that plays a role in its development. The likelihood increases for males who are the firstborn, which might be related to maternal factors during pregnancy or genetics. While females can also develop this condition, the incidence is significantly lower in that demographic. Hence, understanding this pattern helps in early identification and management, making firstborn males the group most commonly recognized as affected by pyloric stenosis.