## Most Common Cause of Mitral Stenosis in India **Key Point:** Rheumatic heart disease (RHD) remains the leading cause of mitral stenosis globally and especially in India, accounting for >80% of cases in developing nations. ### Epidemiology in the Indian Context - RHD prevalence in India: 1–5 per 1000 population (varies by region) - Acute rheumatic fever (ARF) is the precursor; repeated episodes lead to valvular fibrosis and stenosis - Socioeconomic factors: poor living conditions, overcrowding, delayed antibiotic access, and recurrent streptococcal infections increase incidence - Peak age of presentation: 20–40 years (often younger than in developed nations) ### Pathophysiology of Rheumatic Mitral Stenosis 1. Post-streptococcal autoimmune inflammation 2. Valve leaflet fibrosis, thickening, and commissural fusion 3. Gradual narrowing of the mitral orifice (normal area ~4–6 cm²; symptomatic at <2 cm²) 4. Increased left atrial pressure → pulmonary congestion and atrial fibrillation ### Why Other Options Are Less Common | Condition | Frequency | Notes | |-----------|-----------|-------| | **Rheumatic heart disease** | >80% in India | Primary cause; preventable with early ARF treatment | | **Mitral valve prolapse** | 2–3% | Usually asymptomatic; rarely causes stenosis | | **Degenerative calcific stenosis** | <5% in India | More common in elderly Western populations; age >70 | | **Congenital parachute mitral valve** | <1% | Rare; presents in infancy/childhood | **Clinical Pearl:** In an Indian patient presenting with mitral stenosis, assume RHD until proven otherwise. A history of ARF, recurrent sore throats, or poor socioeconomic background strengthens the diagnosis. **High-Yield:** The most effective prevention is **penicillin prophylaxis** after ARF and **prompt treatment of streptococcal pharyngitis** — this is a key exam concept for public health and preventive medicine. **Mnemonic:** **RHD-MS** = Rheumatic Heart Disease is the Most common Stenosis cause in India.
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