A 28-year-old woman from rural India presents with progressive dyspnea on exertion, orthopnea, and palpitations for 6 months. On examination, she has an opening snap, mid-diastolic murmur at the apex, and signs of right ventricular hypertrophy. Chest X-ray shows straightening of the left heart border and pulmonary congestion. Which investigation is most appropriate to confirm the diagnosis and assess severity of mitral stenosis?

Question

Accepted Answer

D. Transthoracic echocardiography with Doppler. ## 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.

![Rheumatic Heart Disease diagram](https://mmcphlazjonnzmdysowq.supabase.co/storage/v1/object/public/blog-images/explanation/2939.webp)

Answer

A. Cardiac MRI with cine imaging

Answer

B. Transesophageal echocardiography

Answer

C. Cardiac catheterization with pressure measurement

Explanation

Investigation of Choice in Rheumatic Mitral Stenosis

Rationale for Transthoracic Echocardiography with Doppler

Comparison Table: Investigations in Mitral Stenosis

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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