A 52-year-old man from rural Maharashtra presents with progressive dyspnea on exertion for 6 months and orthopnea for 2 weeks. He has a history of recurrent fever and joint pain in his teens. On examination: BP 100/70 mmHg, HR 110/min, JVP elevated, bilateral basal crackles, and a pansystolic murmur at the apex. Chest X-ray shows cardiomegaly with pulmonary edema. Echocardiography reveals dilated left ventricle (LVEDD 65 mm), global hypokinesis, ejection fraction 28%, and moderate mitral regurgitation. What is the most likely diagnosis?

Explanation

## Clinical Diagnosis: Dilated Cardiomyopathy Secondary to Rheumatic Heart Disease ### Key Clinical Features **Key Point:** The combination of rheumatic fever history (recurrent fever and joint pain in adolescence), dilated left ventricle with global hypokinesis, reduced ejection fraction (28%), and secondary mitral regurgitation is pathognomonic for dilated cardiomyopathy (DCM) from rheumatic heart disease. ### Pathophysiology 1. **Rheumatic carditis** → chronic inflammation of myocardium and valve apparatus 2. **Myocardial fibrosis and inflammation** → progressive loss of contractile function 3. **Valvular damage** → mitral stenosis/regurgitation → volume overload 4. **Eccentric hypertrophy** → progressive chamber dilation and systolic dysfunction ### Diagnostic Criteria Met | Feature | Finding | Significance | |---------|---------|---------------| | **History** | Rheumatic fever in teens | Establishes prior carditis | | **Hemodynamics** | Elevated JVP, orthopnea | Biventricular failure | | **Auscultation** | Pansystolic murmur at apex | Mitral regurgitation | | **Echo findings** | LVEDD 65 mm, EF 28%, global hypokinesis | Dilated DCM pattern | | **Chest X-ray** | Cardiomegaly + pulmonary edema | Acute decompensation | **High-Yield:** Rheumatic heart disease remains the leading cause of acquired cardiomyopathy in India and developing nations, accounting for ~10–15% of DCM cases in endemic regions [cite:Harrison 21e Ch 297]. ### Differential Echo Patterns **Clinical Pearl:** Unlike restrictive cardiomyopathy (endomyocardial fibrosis), which shows **normal or mildly dilated LV with restrictive filling**, rheumatic DCM presents with **marked LV dilation and reduced ejection fraction**. Restrictive disease also lacks the secondary valvular lesions seen here. ### Management Principles 1. **ACE inhibitors / ARBs** — first-line for systolic dysfunction 2. **Beta-blockers** — reduce mortality in DCM 3. **Diuretics** — manage congestion 4. **Anticoagulation** — if EF <35% or atrial fibrillation 5. **Valve surgery** — if severe mitral regurgitation or stenosis causing hemodynamic compromise **Warning:** Do not confuse secondary mitral regurgitation (from LV dilation) with primary rheumatic mitral stenosis — the former is a consequence of DCM, not the primary lesion.