Clinical Case: 22-Year-Old Woman with Palpitations and Exertional Dyspnea — Mitral Stenosis

Version 1.0 — Published April 2026

The case

A 22-year-old woman presents to the cardiology OPD with complaints of palpitations and breathlessness on exertion for the past 6 months. She reports that climbing two flights of stairs now leaves her winded — something she could do without difficulty a year ago. She also describes episodes of rapid heartbeat lasting 10-15 minutes, occurring 2-3 times per week. She denies chest pain, syncope, or orthopnea. She has no prior surgical history and takes no medications.

On specific questioning, she recalls being hospitalized at age 8 for joint pains and fever that lasted 3 weeks. She was told she had "a heart problem" and was given monthly injections for several years, which she discontinued at age 15.

History and examination

Rheumatic fever in childhood is the single most important clue in this vignette. In India, rheumatic heart disease (RHD) remains the dominant cause of acquired valvular disease in young adults, affecting an estimated 1.5-2 million people (Indian Council of Medical Research, 2019 registry data). The childhood illness with joint pains and monthly injections (benzathine penicillin prophylaxis) strongly points to a prior episode of acute rheumatic fever.

General examination:

• Pulse: 88 bpm, irregularly irregular (suggesting atrial fibrillation)
• Blood pressure: 110/70 mmHg
• JVP: normal
• Malar flush present (mitral facies — the characteristic bluish-pink discoloration of the cheeks due to low cardiac output and CO2 retention)

Cardiovascular examination:

• Apex beat: tapping in character, not displaced (left ventricle is not volume-overloaded in pure mitral stenosis)
• Loud S1 — the stiffened but still mobile valve leaflets close with a snap
• Opening snap (OS) — a high-pitched sound heard in early diastole, best at the left sternal border. The S2-OS interval is short (less than 80 ms), indicating severe stenosis
• Mid-diastolic rumbling murmur — low-pitched, heard best at the apex with the bell of the stethoscope in the left lateral decubitus position, with presystolic accentuation (if in sinus rhythm)
• Loud P2 — suggesting pulmonary hypertension

Respiratory examination: Bilateral basal fine crepitations, suggesting early pulmonary congestion.

Differential diagnosis

Mitral stenosis is the clinical anchor, but the differential for a young woman with palpitations and exertional dyspnea includes:

The combination of rheumatic fever history + mid-diastolic murmur + loud S1 + opening snap is essentially pathognomonic for rheumatic mitral stenosis. No further differential workup is needed before proceeding to echocardiography.

Investigations

Transthoracic echocardiography (TTE) is the investigation of choice for confirming and grading mitral stenosis.

Findings in this patient:

• Mitral valve area (MVA) by planimetry: 0.9 cm2 (severe stenosis; normal is 4-6 cm2)
• Mean transmitral gradient: 14 mmHg (severe > 10 mmHg)
• Commissural fusion — the hallmark of rheumatic etiology. The anterior and posterior leaflets are thickened and fused at the commissures, producing the characteristic "hockey-stick" or "doming" pattern of the anterior mitral leaflet on M-mode
• Wilkins score: 7/16 (leaflet mobility 2, thickening 2, calcification 1, subvalvular disease 2) — favorable for balloon mitral valvotomy
• Left atrial diameter: 48 mm (dilated; normal < 40 mm)
• Pulmonary artery systolic pressure: 55 mmHg (moderate pulmonary hypertension)
• No left atrial thrombus on TTE (transesophageal echo required before intervention to confirm)
• Mild tricuspid regurgitation — secondary to pulmonary hypertension

ECG findings:

• Atrial fibrillation (irregularly irregular rhythm, absent P waves)
• Right axis deviation
• Right ventricular hypertrophy pattern (if pulmonary hypertension is significant)
• In patients with sinus rhythm: the classic P-mitrale (bifid P wave in lead II, duration > 120 ms) indicates left atrial enlargement

Chest X-ray findings:

• Straightening of the left heart border (enlarged left atrial appendage)
• Double density sign (enlarged left atrium seen through the cardiac silhouette)
• Elevated left main bronchus (left atrial enlargement pushes the bronchus upward)
• Pulmonary venous congestion (upper lobe diversion, Kerley B lines)

Diagnosis

Severe rheumatic mitral stenosis (MVA 0.9 cm2) with atrial fibrillation and moderate pulmonary hypertension.

Severity grading of mitral stenosis by valve area (ACC/AHA 2020 guidelines):

Management

Management of mitral stenosis follows two tracks: medical therapy (symptom control and prevention of complications) and definitive intervention (mechanical relief of obstruction).

Medical management

1. Rate control for atrial fibrillation — beta-blockers (metoprolol) or calcium channel blockers (diltiazem) to control ventricular rate. Digoxin is added if rate control is inadequate. Target resting heart rate: 60-80 bpm.
2. Anticoagulation — warfarin (target INR 2.0-3.0) is mandatory in mitral stenosis with AF because the combination carries a 15-20% annual risk of thromboembolism without anticoagulation. NOACs (direct oral anticoagulants) are NOT recommended for valvular AF (as defined by mitral stenosis with AF).
3. Diuretics — for pulmonary congestion (furosemide).
4. Secondary prophylaxis — benzathine penicillin G 1.2 million units IM every 3-4 weeks to prevent recurrent rheumatic fever. Duration: until age 40 or for 10 years after the last episode, whichever is longer (WHO/Indian Heart Association guidelines).
5. Infective endocarditis prophylaxis — no longer routinely recommended for mitral stenosis alone (AHA 2007 guidelines), but still indicated before dental procedures in patients with prosthetic valves.

Interventional management

Balloon mitral valvotomy (BMV) / Percutaneous transvenous mitral commissurotomy (PTMC):

• The procedure of choice for symptomatic mitral stenosis with favorable valve morphology
• Uses the Inoue balloon technique via the transseptal (interatrial septum) approach
• Success criteria: MVA increase to > 1.5 cm2, reduction in mean gradient by > 50%
• Indications: symptomatic (NYHA II-IV) + MVA < 1.5 cm2 + favorable Wilkins score (8 or below) + no significant MR (grade 2 or below) + no LA thrombus on TEE

Mitral valve replacement (MVR):

• Indicated when BMV is not feasible: Wilkins score > 8, significant MR, LA thrombus not resolved with anticoagulation, failed BMV, or unfavorable commissural calcification
• Mechanical valve (ball-cage Starr-Edwards is historical; bileaflet St. Jude is current standard) — requires lifelong warfarin
• Bioprosthetic valve — limited durability (10-15 years), preferred in women of childbearing age who wish to avoid long-term anticoagulation (though re-operation will be needed)

For this patient: Wilkins score 7/16, no significant MR, no LA thrombus — she is an excellent candidate for BMV. TEE must be done before the procedure to definitively exclude LA thrombus.

Practice cardiology and medicine MCQs with AI-powered explanations to test your clinical reasoning on valvular heart disease cases.

How NEET PG tests mitral stenosis

Mitral stenosis is tested in NEET PG through three dominant patterns:

Pattern 1 — The clinical vignette: A young woman (15-30 years) with palpitations, dyspnea, and a history of childhood joint pains. The stem describes auscultatory findings. You must identify the murmur timing (diastolic, not systolic) and the associated findings (loud S1, opening snap). The trap: confusing the diastolic murmur of MS with the diastolic murmur of aortic regurgitation (early diastolic, decrescendo, at the left sternal border).

Pattern 2 — The echo question: Given valve area and gradient, classify severity. Or given the Wilkins score components, decide BMV vs MVR. Key numbers to memorize: severe MS < 1.0 cm2, moderate 1.0-1.5 cm2, Wilkins cutoff 8.

Pattern 3 — The management question: When to anticoagulate (any MS + AF = warfarin, NOT NOACs), when to do BMV vs MVR, and what secondary prophylaxis to continue.

High-yield one-liners for last-day revision:

• Mitral stenosis is the most common valvular lesion caused by rheumatic heart disease
• The most common cause of mitral stenosis worldwide is rheumatic fever
• Austin Flint murmur = functional mitral stenosis due to severe AR (jet hitting the anterior mitral leaflet)
• Graham Steell murmur = pulmonary regurgitation due to pulmonary hypertension secondary to MS
• Lutembacher syndrome = ASD + rheumatic mitral stenosis

Frequently asked questions

What is the most common cause of mitral stenosis in India?

Rheumatic heart disease accounts for over 95% of mitral stenosis cases in India. The initial streptococcal pharyngitis triggers an autoimmune response (molecular mimicry) that damages the mitral valve, with clinical valve disease appearing 10-20 years after the acute episode. This contrasts with the West, where degenerative calcific stenosis is increasingly common.

What is the pathognomonic auscultatory finding in mitral stenosis?

The mid-diastolic rumbling murmur with presystolic accentuation (in sinus rhythm) heard best at the apex with the bell of the stethoscope in the left lateral decubitus position. The opening snap heard after S2 is also characteristic — a shorter S2-OS interval indicates more severe stenosis because higher left atrial pressure opens the valve earlier.

What mitral valve area indicates severe mitral stenosis?

A mitral valve area below 1.0 cm2 indicates severe stenosis. Normal mitral valve area is 4-6 cm2. Moderate stenosis is 1.0-1.5 cm2, and mild stenosis is 1.5-2.0 cm2. Symptoms typically begin when the valve area falls below 2.0 cm2. These cutoffs are directly tested in NEET PG echo interpretation questions.

When is balloon mitral valvotomy preferred over mitral valve replacement?

BMV is preferred when the valve is pliable (Wilkins score 8 or below out of 16), there is no significant mitral regurgitation, no left atrial thrombus on transesophageal echo, and commissural fusion is the dominant pathology. A Wilkins score above 8 suggests extensive calcification and subvalvular disease, making surgical replacement (MVR) the better option.

Why does atrial fibrillation develop in mitral stenosis?

Chronic pressure overload from mitral stenosis causes left atrial dilatation and fibrosis, which disrupts normal atrial conduction pathways. Atrial fibrillation develops in 30-40% of patients with significant mitral stenosis. It worsens symptoms because loss of the atrial kick reduces cardiac output by 15-25%, and the rapid ventricular rate shortens diastolic filling time across the stenotic valve.

How is mitral stenosis tested in NEET PG?

NBE tests mitral stenosis through three patterns: clinical vignettes with classic auscultatory findings (mid-diastolic murmur, loud S1, opening snap), echo interpretation (commissural fusion, valve area, Wilkins score), and management decisions (BMV vs MVR indications). The most common trap is confusing mitral stenosis murmur timing (diastolic) with mitral regurgitation (pansystolic). Expect 1-2 questions per paper from valvular heart disease.

Sources and references

1. Harrison's Principles of Internal Medicine, 21st Edition (Loscalzo et al., 2022) — Chapter on Valvular Heart Disease, mitral stenosis pathophysiology and management.
2. ACC/AHA 2020 Guideline for the Management of Patients with Valvular Heart Disease — severity grading criteria and intervention thresholds.
3. Braunwald's Heart Disease, 12th Edition (Libby et al., 2022) — comprehensive cardiology reference for rheumatic heart disease epidemiology in developing countries.

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Written by: NEETPGAI Editorial Team Reviewed by: Pending SME Review Last reviewed: April 2026

This article is reviewed by qualified medical professionals for clinical accuracy and exam relevance. For corrections or updates, contact the editorial team.