Eisenmenger syndrome-True are All except ?
**Core Concept**
Eisenmenger syndrome is a condition characterized by the reversal of left-to-right shunt in congenital heart defects, leading to pulmonary hypertension and cyanosis. This results from a chronic increase in pulmonary vascular resistance, causing a right-to-left shunt.
**Why the Correct Answer is Right**
The correct answer will be a statement that is true about Eisenmenger syndrome. This condition typically develops in patients with large congenital heart defects, such as ventricular septal defects (VSDs) or atrial septal defects (ASDs), which are not adequately repaired. The chronic increase in pulmonary vascular resistance is mediated by the release of vasoconstrictive substances, such as endothelin-1, and the proliferation of pulmonary vascular smooth muscle cells. This leads to a decrease in the cross-sectional area of the pulmonary vessels, further increasing resistance.
**Why Each Wrong Option is Incorrect**
**Option A:** Eisenmenger syndrome is typically diagnosed in childhood. This is incorrect because Eisenmenger syndrome often develops in late childhood or early adulthood, after the initial congenital defect has been present for many years.
**Option B:** The primary treatment for Eisenmenger syndrome is surgical repair of the underlying congenital heart defect. This is incorrect because surgical repair is not always possible, and even if it is, the increased pulmonary vascular resistance may prevent successful repair.
**Option C:** Pulmonary hypertension is a hallmark of Eisenmenger syndrome. This is correct, as the chronic increase in pulmonary vascular resistance is a key feature of this condition.
**Option D:** Eisenmenger syndrome is always associated with a large VSD. This is incorrect because while VSDs are a common cause of Eisenmenger syndrome, other congenital heart defects, such as ASDs, can also lead to this condition.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that Eisenmenger syndrome is a diagnosis of exclusion, and other conditions, such as pulmonary hypertension due to other causes, must be ruled out before making this diagnosis. Additionally, the development of Eisenmenger syndrome is often a sign of uncorrected or undertreated congenital heart disease.
**Correct Answer: D. Eisenmenger syndrome is always associated with a large VSD.**