Question:medium
The most important prognostic factor in congenital diaphragmatic hernia is?
The most important prognostic factor in congenital diaphragmatic hernia is?
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Think of what actually causes death: lung hypoplasia leading to refractory pulmonary hypertension, not the surgery.
Updated On: Jun 24, 2026
- Pulmonary hypertension
- Timing of surgery
- Size of the defect
- Gestational age at which the child was born
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The Correct Option is A
Solution and Explanation
To rank the prognostic factors in congenital diaphragmatic hernia, trace the disease back to what actually kills these infants. The herniated bowel and other viscera occupy the chest while the lungs are still forming, so the lungs end up small and underdeveloped, a state called pulmonary hypoplasia. A hypoplastic lung carries fewer alveoli and a thick, hyper-reactive pulmonary vasculature, and after delivery this vasculature fails to relax, generating severe pulmonary hypertension. The resulting right-to-left shunting and persistent hypoxemia are the proximate cause of neonatal death, which is why modern management stabilizes the circulation first and repairs the diaphragm only later. Viewed this way, the operation is not the survival-limiting step, so timing of surgery is not the answer. Defect size and gestational age do influence outcome, but each does so indirectly by changing how much lung develops and therefore how bad the pulmonary hypertension becomes. The factor that sits closest to mortality, and that all other variables funnel through, is the severity of pulmonary hypertension arising from lung hypoplasia. $\text{Lung hypoplasia} \rightarrow \text{pulmonary hypertension} \rightarrow \text{prognosis}$.\[\boxed{\text{Pulmonary hypertension}}\]
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