A 28-year-old woman from rural India presents with dyspnea on exertion and orthopnea for 3 months. On examination, she has an opening snap, diastolic murmur at the apex, and signs of pulmonary edema. Chest X-ray shows cardiomegaly and pulmonary congestion. Echocardiography confirms mitral stenosis with a valve area of 1.2 cm². She is currently on diuretics and digoxin. What is the most appropriate next step in management?

Explanation

## Clinical Context This patient has symptomatic mitral stenosis (MS) with hemodynamically significant stenosis (valve area 1.2 cm²; normal >4 cm²) causing pulmonary edema despite medical therapy. ## Indications for Percutaneous Mitral Balloon Valvotomy (PMBV) **Key Point:** PMBV is the procedure of choice for symptomatic mitral stenosis with favorable valve morphology and no contraindications. | Feature | Indication for PMBV | | --- | --- | | Symptoms | Symptomatic (NYHA II–IV) | | Valve area | <1.5 cm² | | Valve morphology | Pliable, non-calcified leaflets | | LA thrombus | Absent | | MR severity | Mild or none | | Atrial fibrillation | May be present | **High-Yield:** PMBV has superior outcomes to surgical mitral commissurotomy in suitable candidates and is the gold standard in India where rheumatic MS is endemic. ## Why PMBV is Next 1. **Symptomatic despite medical therapy** — diuretics and digoxin provide only symptomatic relief; they do not alter the structural stenosis. 2. **Hemodynamically significant stenosis** — valve area 1.2 cm² is well below the 1.5 cm² threshold for intervention. 3. **Likely favorable anatomy** — no mention of calcification, thrombus, or severe MR; typical of young Indian patients with rheumatic MS. 4. **Avoids surgery** — PMBV is less invasive than open mitral commissurotomy or valve replacement. **Clinical Pearl:** Opening snap and diastolic murmur indicate pliable leaflets—a favorable prognostic sign for PMBV success. ## Management Algorithm ```mermaid flowchart TD A[Symptomatic Mitral Stenosis]:::outcome --> B{Valve area < 1.5 cm²?}:::decision B -->|No| C[Continue medical management]:::action B -->|Yes| D{Favorable morphology?}:::decision D -->|No| E[Surgical commissurotomy or MVR]:::action D -->|Yes| F{LA thrombus?}:::decision F -->|Yes| G[Anticoagulate, then reassess]:::action F -->|No| H[PMBV]:::action H --> I[Symptom relief & improved hemodynamics]:::outcome ``` **Mnemonic:** **PMBV FIRST** — Pliable, Mitral, Balloon, Valvotomy = First-line for suitable MS.