A 40 year old woman has had several episodes of rheumatic fever as a child. She is currently afebrile and feels well, and has come to a hospital for monitoring echocardiography. Which of the following would be most likely to be seen in this patient’s mitral valve?
**Core Concept**
The patient is at risk of developing valvular heart disease due to recurrent rheumatic fever, which causes autoimmune inflammation and scarring of the heart valves, particularly the mitral valve. This condition is known as rheumatic heart disease (RHD).
**Why the Correct Answer is Right**
In RHD, the mitral valve becomes fibrotic and stenotic, leading to narrowing of the valve opening and impeding blood flow from the left atrium to the left ventricle. This results in left atrial enlargement and potentially pulmonary congestion. The fibrotic changes are characterized by the formation of Aschoff bodies, which are granulomatous lesions composed of immune cells and fibroblasts. Over time, the valve becomes calcified, further reducing its mobility and increasing the risk of valve incompetence.
**Why Each Wrong Option is Incorrect**
* **Option A:** Mitral regurgitation would be more characteristic of acute rheumatic carditis, where the valve leaflets are still inflamed and dysfunctional, rather than the chronic scarring and fibrosis seen in RHD.
* **Option B:** Mitral valve prolapse is a condition of the mitral valve where the leaflets bulge back into the left atrium during systole, but it is not typically associated with rheumatic fever.
* **Option C:** Tricuspid valve involvement is not a common feature of rheumatic heart disease, which primarily affects the mitral and aortic valves.
**Clinical Pearl / High-Yield Fact**
Rheumatic heart disease is a significant cause of valvular heart disease worldwide, particularly in developing countries where access to antibiotics and other treatments is limited. The presence of RHD can be diagnosed on echocardiography by the presence of valve thickening, calcification, or stenosis, and is often associated with a history of recurrent rheumatic fever.
**Correct Answer:** C. Mitral valve stenosis.