MCQ IN MEDICINE

Detailed explanation-1: -Over 2 to 3 decades, valvular stenosis and/or regurgitation results. In chronic rheumatic heart disease, the mitral valve alone is the most commonly affected valve in an estimated 50% to 60% of cases. Combined lesions of both the aortic and mitral valves occur in 20% of cases.

Detailed explanation-2: -Mitral stenosis (MS) is a form of valvular heart disease characterized by the narrowing of the mitral valve orifice. The most common cause of mitral stenosis is rheumatic fever, though the stenosis typically does not become clinically relevant until several decades later.