Lutembacher’s syndrome comprises of –
**Core Concept**
Lutembacher's syndrome is a rare cardiac condition characterized by the association of a congenital atrial septal defect (ASD) with a patient having a pre-existing mitral stenosis. This results in a unique hemodynamic situation, where blood flow from the left to the right atrium is shunted through the ASD, while blood flow from the right to the left atrium is obstructed by the mitral stenosis.
**Why the Correct Answer is Right**
The combination of ASD and mitral stenosis in Lutembacher's syndrome leads to a paradoxical increase in pulmonary vascular resistance, as blood flow from the left to the right atrium increases the volume load on the right heart. This increased volume load results in right heart enlargement and failure. The mitral stenosis, on the other hand, causes left atrial enlargement and failure. The unique hemodynamic situation in Lutembacher's syndrome is due to the combination of these two lesions.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to Lutembacher's syndrome, which is characterized by a combination of ASD and mitral stenosis, not aortic stenosis.
**Option B:** This option is incorrect because Lutembacher's syndrome does not involve a patent foramen ovale (PFO), which is a different type of congenital heart defect.
**Option C:** This option is not accurate because Lutembacher's syndrome is not characterized by a ventricular septal defect (VSD), which is a different type of congenital heart defect.
**Clinical Pearl / High-Yield Fact**
Lutembacher's syndrome is a classic example of a "double-barreled" cardiac lesion, where two separate abnormalities combine to produce a unique hemodynamic situation. Remember that any patient with a congenital heart defect who presents with symptoms of heart failure should be evaluated for the possibility of Lutembacher's syndrome.
**Correct Answer:** C.