Question

The most important prognostic factor in congenital diaphragmatic hernia is?

• A. Pulmonary hypertension
• B. Timing of surgery
• C. Size of the defect
• D. Gestational age at which the child was born

Hint:

Think of what actually causes death: lung hypoplasia leading to refractory pulmonary hypertension, not the surgery.

Answer 1

The Correct Option is A

Step 1: Understand the pathophysiology of congenital diaphragmatic hernia (CDH). The diaphragmatic defect allows abdominal viscera to herniate into the thorax during fetal life, compressing the developing lungs and causing pulmonary hypoplasia.
Step 2: The hypoplastic lung has a reduced and abnormally muscularized pulmonary vascular bed. After birth this produces persistent pulmonary hypertension, with right-to-left shunting and refractory hypoxemia.
Step 3: Outcome in CDH is determined mainly by the degree of lung hypoplasia and the severity of the resulting pulmonary hypertension, not by the operation itself. CDH is no longer a surgical emergency; surgery is delayed until the infant is physiologically stable.
Step 4: The other options are weaker predictors. Timing of surgery does not drive survival once the infant is stabilized. Size of the defect correlates with hypoplasia but acts through the degree of pulmonary hypertension. Gestational age matters generally but is not the dominant factor here.
Conclusion: Pulmonary hypertension (with the underlying pulmonary hypoplasia) is the most important prognostic factor. This matches the printed key (option A).