Most common cause of acquired hea disease in children
**Core Concept**
Acquired heart disease in children can result from various congenital and acquired conditions. Rheumatic heart disease (RHD), a complication of rheumatic fever, is a leading cause of acquired heart disease in children worldwide.
**Why the Correct Answer is Right**
Rheumatic fever, caused by Group A beta-hemolytic streptococci (GABHS), can lead to RHD due to autoimmune-mediated inflammation and fibrosis of the heart valves. The autoimmune response is triggered by molecular mimicry between streptococcal antigens and cardiac tissue. This process results in valve dysfunction, particularly affecting the mitral valve. The involvement of the mitral valve is more common than the aortic valve in RHD.
**Why Each Wrong Option is Incorrect**
**Option A:** Congenital heart disease is a leading cause of heart disease in children, but it is not an acquired condition. Congenital heart disease is present at birth.
**Option B:** Kawasaki disease is an acquired condition that causes inflammation in blood vessels, including coronary arteries. However, it is not the most common cause of acquired heart disease in children.
**Option C:** Cardiac tumors are rare in children and are not a common cause of acquired heart disease.
**Clinical Pearl / High-Yield Fact**
Rheumatic heart disease is a significant public health burden in developing countries, where access to healthcare and streptococcal infection management may be limited.
**Correct Answer: C. Kawasaki disease is an acquired condition that causes inflammation in blood vessels, including coronary arteries. However, it is not the most common cause of acquired heart disease in children.