## Epidemiological Distinction Between CAD and RHD in India ### Coronary Artery Disease (CAD) **Key Point:** CAD in India shows a distinctly modern epidemiological pattern driven by urbanization and lifestyle factors. - Male predominance (M:F ratio ~3:1 to 4:1) - Concentrated in urban and semi-urban areas - Strong association with modifiable risk factors: smoking, sedentary lifestyle, dyslipidemia, hypertension, diabetes, obesity - Rising incidence correlates with economic development and Westernization - Affects economically productive age groups (40–60 years) ### Rheumatic Heart Disease (RHD) **Key Point:** RHD follows a traditional epidemiological pattern linked to poverty, poor sanitation, and recurrent streptococcal infections. - Female predominance (especially mitral stenosis; M:F ratio ~1:2) - Rural and semi-urban predominance; associated with lower socioeconomic status - Driven by recurrent group A streptococcal pharyngitis and acute rheumatic fever (ARF) - Preventable through early antibiotic treatment and penicillin prophylaxis - Affects younger populations (15–40 years) ### Comparative Table | Feature | CAD | RHD | |---------|-----|-----| | **Gender** | Male predominance | Female predominance | | **Geography** | Urban/semi-urban | Rural/semi-urban | | **Socioeconomic** | Rising with affluence | Associated with poverty | | **Primary Risk Factors** | Modifiable (smoking, lipids, HTN, DM) | Recurrent streptococcal infection | | **Age of Onset** | 40–60 years | 15–40 years | | **Prevention** | Lifestyle + pharmacotherapy | Antibiotic prophylaxis | **High-Yield:** The **male predominance and urban concentration of CAD** versus the **female predominance and rural concentration of RHD** is the single best epidemiological discriminator in the Indian context. **Clinical Pearl:** India is experiencing a dual burden: RHD remains endemic in rural areas while CAD is rapidly rising in urban centers, reflecting the epidemiological transition. [cite:Park 26e Ch 8] 
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