Eisenmenger complex is common in adult in ?
**Core Concept**
Eisenmenger complex is a cyanotic congenital heart defect characterized by a large left-to-right shunt that eventually reverses due to pulmonary hypertension, leading to a right-to-left shunt and cyanosis. This condition typically develops in adulthood.
**Why the Correct Answer is Right**
The Eisenmenger complex is a result of prolonged left-to-right shunting, which leads to pulmonary hypertension and subsequently reverses the shunt direction. This reversal is due to the increased resistance in the pulmonary vasculature, causing blood to flow from the right heart to the left heart, resulting in cyanosis. The most common underlying defect in Eisenmenger complex is a large ventricular septal defect (VSD).
**Why Each Wrong Option is Incorrect**
**Option A:** Tetralogy of Fallot is another cyanotic congenital heart defect, but it is typically diagnosed in infancy, not adulthood.
**Option B:** Atrial septal defects (ASDs) may lead to left-to-right shunting, but they rarely progress to Eisenmenger complex.
**Option C:** Patent ductus arteriosus (PDA) can also cause left-to-right shunting, but it is less likely to result in Eisenmenger complex compared to VSD.
**Clinical Pearl / High-Yield Fact**
Eisenmenger complex often presents with symptoms of cyanosis, clubbing, and exertional dyspnea. It is essential to differentiate Eisenmenger complex from other cyanotic heart defects, as the management and prognosis differ significantly.
**Correct Answer: D. Ventricular septal defect**