A 32-year-old woman from rural India presents to the outpatient clinic with progressive dyspnea on exertion for 6 months. She reports orthopnea and occasional hemoptysis. On examination, she is in sinus rhythm with a heart rate of 92/min. Auscultation reveals a loud S1, an opening snap at 80 ms after A2, and a low-pitched diastolic murmur best heard at the apex with the patient in the left lateral decubitus position. Chest X-ray shows straightening of the left heart border and pulmonary edema. Echocardiography confirms a mitral valve area of 1.2 cm². What is the most appropriate next step in management?

Explanation

## Clinical Diagnosis: Severe Mitral Stenosis **Key Point:** This patient has symptomatic severe mitral stenosis (MVA ≤1.5 cm²) with hemoptysis and pulmonary edema — hallmarks of decompensation. ### Diagnostic Features Identified - **Loud S1:** Indicates a mobile mitral valve and high LV pressure at end-diastole - **Opening snap (80 ms after A2):** The shorter the interval, the more severe the stenosis; 80 ms = severe MS - **Diastolic murmur at apex:** Classic for mitral stenosis; low-pitched, heard best in left lateral decubitus position - **Straight left heart border (CXR):** Indicates left atrial enlargement - **MVA 1.2 cm²:** Severe stenosis (normal >4 cm²; moderate 1.5–2.5 cm²) ### Management Algorithm for Symptomatic Severe MS ```mermaid flowchart TD A[Symptomatic Severe MS<br/>MVA ≤1.5 cm²]:::outcome --> B{Suitable for PMBV?}:::decision B -->|Yes<br/>Mobile valve<br/>No LA thrombus| C[Percutaneous Mitral<br/>Balloon Valvotomy]:::action B -->|No<br/>Calcified/rigid valve| D[Surgical Commissurotomy<br/>or MVR]:::action C --> E[Symptom relief<br/>Improved MVA]:::outcome D --> F[Definitive treatment]:::outcome A -->|Acute decompensation| G[Diuretics + Anticoagulation<br/>Bridge to intervention]:::action ``` ### Why PMBV Is First-Line Here 1. **Rheumatic mitral stenosis with mobile valve:** The patient is young, from a high-prevalence region, and has a favorable anatomy (loud S1, short opening snap = mobile valve) 2. **Symptomatic with severe stenosis:** Hemoptysis and pulmonary edema indicate urgent need for intervention 3. **PMBV advantages:** - Percutaneous (less invasive than surgery) - Excellent immediate and long-term outcomes in suitable candidates - Preserves native valve - Can be repeated if needed 4. **Echocardiography should confirm:** Absence of LA thrombus, minimal mitral regurgitation, and pliable leaflets (Wilkins score <8) before PMBV **High-Yield:** In symptomatic severe MS with favorable valve anatomy, PMBV is the procedure of choice in most guidelines (ESC, ACC/AHA) and is preferred over surgical commissurotomy or MVR in the first instance. **Clinical Pearl:** The opening snap interval directly reflects the severity of stenosis — the shorter the interval (A2 to OS), the higher the LA pressure and the more severe the obstruction. ### Immediate Supportive Care - Diuretics for pulmonary congestion - Beta-blockers or rate-limiting calcium channel blockers to slow ventricular rate and increase diastolic filling time - Anticoagulation (warfarin or DOAC) to prevent LA thrombus and systemic embolism (risk is high in AF and severe MS) [cite:Harrison 21e Ch 297]