## Investigation of Choice in Rheumatic Mitral Stenosis ### Rationale for Transthoracic Echocardiography with Doppler **Key Point:** Transthoracic echocardiography (TTE) with Doppler is the gold-standard, non-invasive first-line investigation for diagnosis and hemodynamic assessment of mitral stenosis. **High-Yield:** TTE provides: - Direct visualization of the mitral valve apparatus - Measurement of mitral valve area (MVA) using planimetry or pressure half-time method - Assessment of left atrial size and thrombus - Evaluation of associated lesions (aortic, tricuspid involvement) - Estimation of pulmonary artery pressure - Grading of stenosis severity (mild MVA >1.5 cm², moderate 1.0–1.5 cm², severe <1.0 cm²) ### Comparison Table: Investigations in Mitral Stenosis | Investigation | Role | Timing | Limitations | |---|---|---|---| | **TTE with Doppler** | First-line diagnosis & severity | Initial evaluation | Acoustic window dependent; cannot assess commissural fusion detail | | **Transesophageal echo (TEE)** | Assess thrombus, commissural fusion, suitability for PMBC | Pre-intervention | Invasive; reserved for specific indications | | **Cardiac catheterization** | Pressure gradients, pulmonary vascular resistance | Rarely needed; if echo inconclusive or pre-surgery | Invasive; risk of embolism; largely replaced by echo | | **Cardiac MRI** | Morphology, fibrosis, function | Research/complex cases | Expensive; not first-line; contraindicated with metallic prosthesis | **Clinical Pearl:** In this patient with classic clinical findings (opening snap, mid-diastolic murmur, orthopnea, RV hypertrophy), TTE will confirm mitral stenosis, measure MVA, and guide management (medical therapy vs. percutaneous mitral balloon commissurotomy [PMBC] vs. surgery). **Mnemonic: "TTE-FIRST"** — **T**ransthoracic echo is **F**irst-line, **I**nvasive-free, **R**eliable for **S**everity, **T**herapy-guiding. 
Sign up free to access AI-powered MCQ practice with detailed explanations and adaptive learning.