Bronchopulmonary dysplasia seen in all except –
**Bronchopulmonary Dysplasia (BPD)**
### Core Concept
Bronchopulmonary dysplasia (BPD) is a chronic respiratory disease primarily affecting premature infants, characterized by the destruction and inflammation of the lung tissue. It results from the combination of mechanical ventilation and oxygen therapy, leading to oxidative stress and inflammation in the developing lung.
### Why the Correct Answer is Right
The development of BPD is closely linked to the immaturity of the premature lung, which is prone to injury from mechanical ventilation and oxygen therapy. The use of high-frequency oscillatory ventilation (HFOV) and surfactant replacement therapy can mitigate this risk, but the underlying pathophysiology involves the disruption of normal lung development. The key factors contributing to BPD include the degree of prematurity, the duration of mechanical ventilation, and the level of oxygen therapy.
### Why Each Wrong Option is Incorrect
**Option A:** Premature infants with respiratory distress syndrome (RDS) are at high risk of developing BPD, as the use of mechanical ventilation and oxygen therapy can exacerbate lung injury. Premature infants with RDS are indeed at risk of BPD.
**Option B:** Infants with congenital diaphragmatic hernia (CDH) are also at risk of developing BPD due to the underlying pulmonary hypoplasia and the need for prolonged mechanical ventilation. CDH is associated with BPD.
**Option C:** Infants born to mothers with chronic hypertension are at risk of developing BPD, as the underlying maternal condition can lead to placental insufficiency and fetal growth restriction. Chronic hypertension in the mother is associated with BPD.
**Option D:** Infants born to mothers with well-controlled diabetes are not at increased risk of developing BPD. Well-controlled maternal diabetes does not increase the risk of BPD.
### Clinical Pearl / High-Yield Fact
Infants born at or after 32 weeks' gestation are less likely to develop BPD compared to those born earlier. The risk of BPD decreases significantly with increasing gestational age.
### Correct Answer: D. Infants born to mothers with well-controlled diabetes are not at increased risk of developing BPD.