## Most Common Cause of Left Ventricular Hypertrophy **Key Point:** Chronic systemic hypertension is the most common cause of left ventricular hypertrophy (LVH) worldwide and in India, accounting for >90% of cases in the general population. ### Pathophysiology of Hypertension-Induced LVH 1. **Increased afterload** from sustained elevation of systemic blood pressure 2. **Myocyte hypertrophy** — individual cardiac myocytes enlarge in response to mechanical stress 3. **Concentric pattern** — wall thickens symmetrically; cavity size remains normal or decreases 4. **Diastolic dysfunction** develops early; systolic function preserved initially ### Differential Causes of LVH | Cause | Prevalence | Pattern | Key Feature | |-------|-----------|---------|-------------| | **Chronic hypertension** | Most common (>90%) | Concentric | Symmetric wall thickening | | Aortic stenosis | Rare in India now | Concentric | Valvular obstruction on echo | | HCM | <1% population | Eccentric/asymmetric | Genetic, SAM, obstruction | | Athletic heart | Physiologic | Eccentric | Athlete, reversible | **High-Yield:** In any Indian patient with LVH, hypertension is the default diagnosis until proven otherwise. The prevalence of hypertension in urban India is 25–30%, making it the leading cause of cardiac remodeling. **Clinical Pearl:** LVH from hypertension is initially *reversible* if blood pressure is controlled early; prolonged hypertension leads to fibrosis and irreversible diastolic dysfunction. ### Why Hypertension Dominates - **Epidemiology:** ~250 million hypertensive individuals in India; aortic stenosis is now rare due to rheumatic heart disease decline - **Mechanism:** Sustained pressure overload triggers sustained myocyte growth - **Time course:** Develops over years of uncontrolled BP [cite:Robbins 10e Ch 12]
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