What is the most common cause of mitral stenosis in India?

Question

Accepted Answer

B. Rheumatic heart disease. ## 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.

Answer

A. Mitral valve prolapse

Answer

C. Congenital parachute mitral valve

Answer

D. Degenerative calcific stenosis

What is the most common cause of mitral stenosis in India?

Explanation

Most Common Cause of Mitral Stenosis in India

Epidemiology in the Indian Context

Pathophysiology of Rheumatic Mitral Stenosis

Why Other Options Are Less Common

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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