A 58-year-old man from rural Maharashtra presents with progressive dyspnea on exertion for 6 months and orthopnea. He has a history of acute rheumatic fever at age 12. On examination, blood pressure is 140/90 mmHg, heart rate 88/min regular, JVP elevated at 6 cm. Auscultation reveals a loud S1, an opening snap, and a low-pitched diastolic murmur best heard at the apex in the left lateral decubitus position. Chest X-ray shows pulmonary edema and straightening of the left heart border. Echocardiography confirms a mitral valve area of 1.2 cm². What is the most appropriate next step in management?

Explanation

## Clinical Diagnosis **Key Point:** This patient has symptomatic mitral stenosis (MS) with hemodynamically significant stenosis (MVA 1.2 cm²; normal >4 cm²). ### Diagnostic Features - **Loud S1** — increased LV contractility and stiffness of anterior mitral leaflet - **Opening snap** — abrupt halting of mitral leaflet motion in early diastole - **Low-pitched diastolic murmur** — turbulent flow across stenotic mitral valve - **Pulmonary edema** — elevated LA pressure transmitted backward - **Straightening of left heart border** — left atrial enlargement ## Management Algorithm for Symptomatic MS ```mermaid flowchart TD A[Symptomatic Mitral Stenosis]:::outcome --> B{MVA and Valve Morphology?}:::decision B -->|MVA > 1.5 cm² + Favorable anatomy| C[Percutaneous Mitral Balloon Valvuloplasty]:::action B -->|MVA ≤ 1.0 cm² OR Unfavorable anatomy| D[Surgical Commissurotomy/Replacement]:::action C --> E[Relief of symptoms]:::outcome D --> F[Definitive treatment]:::outcome ``` ### Why Percutaneous Mitral Balloon Valvuloplasty (PMBV)? **High-Yield:** PMBV is the procedure of choice for symptomatic MS with: - MVA 1.0–1.5 cm² (this patient: 1.2 cm²) - Favorable valve anatomy (pliable leaflets, minimal calcification, no LA thrombus) - Absence of moderate-to-severe mitral regurgitation **Clinical Pearl:** PMBV avoids long-term anticoagulation and valve replacement complications in young patients with rheumatic MS. Success rate >80% with appropriate patient selection [cite:Harrison 21e Ch 297]. ### Why Not the Other Options? | Option | Rationale | |--------|----------| | **Medical therapy alone** | Diuretics and ACE inhibitors relieve congestion but do not address the fixed anatomic obstruction; symptomatic MS requires intervention | | **Surgical commissurotomy** | Indicated when PMBV is contraindicated or fails; not first-line in modern practice | | **Valve replacement** | Reserved for unfavorable anatomy, severe calcification, or failed PMBV; carries higher morbidity and requires lifelong anticoagulation | **Warning:** Do not confuse symptomatic MS requiring intervention with asymptomatic MS (which may be managed medically with anticoagulation if AF present).