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Mitral Stenosis — Complete Medicine Notes with Homeopathic Approach

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OVERVIEW

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ETIOLOGY

Epidemiology: ~39 million cases of rheumatic heart disease worldwide; MS prevalent in developing nations (20–30/1000 school children on echo screening). In developed nations, prevalence is 0.02% due to antibiotic prophylaxis and improved socioeconomic conditions. — Fuster & Hurst's The Heart, 15th Ed.

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PATHOPHYSIOLOGY

1. Commissural fusion, leaflet thickening & calcification → ↓ MVA
2. Persistent diastolic pressure gradient across the mitral valve (LA > LV)
3. Left atrial enlargement and elevated LA pressure
4. Pulmonary venous hypertension → pulmonary edema (dyspnea)
5. Reactive pulmonary arterial hypertension (PAH) → RV hypertrophy and failure
6. LA dilation + stasis → atrial fibrillation (AF) and thromboembolism (stroke)

• Transmitral gradient increases with tachycardia (less diastolic filling time)
• CO can be normal at rest but fails to increase with exercise
• MVA by pressure half-time (PHT): MVA = 220 / PHT

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SEVERITY GRADING (AHA/ACC)

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CLINICAL FEATURES

Symptoms

• Dyspnea on exertion → orthopnea → PND (earliest and most common)
• Hemoptysis — due to rupture of pulmonary-bronchial venous anastomoses
• Palpitations — AF is the most common arrhythmia
• Systemic embolism — stroke, TIA (especially with AF)
• Hoarseness — Ortner's syndrome: LA enlargement compressing recurrent laryngeal nerve
• Chest pain — uncommon; due to PAH or coexistent CAD
• Fatigue — low cardiac output state
• Recurrent bronchitis

Signs

• Malar flush ("mitral facies") — dilated capillaries in the cheeks due to low CO
• Tapping apex — palpable loud S1
• Parasternal heave — RV enlargement (sign of PAH)
• Diastolic thrill (rare)

Auscultation (Classic Triad)

1. Loud S1 — due to abrupt tensing of stiffened mitral leaflets
2. Opening Snap (OS) — follows A2 by 0.05–0.12 s; shorter A2–OS interval = more severe MS
3. Low-pitched mid-diastolic rumbling murmur — best heard at apex with bell, patient in left lateral decubitus, accentuated by mild exercise; presystolic accentuation in sinus rhythm

• Loud P2, closely split S2 (PAH)
• Graham Steell murmur — high-pitched, early diastolic decrescendo along left sternal border (pulmonary regurgitation due to PAH)
• Functional TR murmur (pansystolic, louder on inspiration — Carvallo's sign)

Note: In severe MS with very low CO, the murmur may become inaudible ("silent MS"). — Harrison's Principles of Internal Medicine, 22nd Ed.

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INVESTIGATIONS

ECG

• P-mitrale (bifid P in lead II, width >0.12 s) — LA enlargement in sinus rhythm
• Tall, peaked P in lead V1 (negative terminal deflection)
• AF — most common arrhythmia in established MS
• RV hypertrophy pattern (right axis deviation, dominant R in V1) if PAH

Chest X-Ray

• LA enlargement — double shadow at right heart border, elevated left main bronchus, left atrial appendage prominence (straightening of left heart border)
• Pulmonary venous hypertension — upper lobe diversion, Kerley B lines, interstitial edema
• Mitral valve calcification
• RV enlargement (loss of retrosternal airspace on lateral)

Echocardiography (Investigation of Choice)

• 2D echo: Doming ("hockey stick") of anterior mitral leaflet; restricted posterior leaflet; commissural fusion; calcification; Wilkins score
• Doppler: Mean transmitral gradient, PHT-derived MVA; assess PAH (TR jet velocity)
• Planimetry: Direct MVA measurement
• TEE: Exclude LA appendage thrombus before valvuloplasty or cardioversion

• Leaflet mobility
• Leaflet thickening
• Subvalvular thickening
• Calcification

Cardiac Catheterization

• Reserved when echo inconclusive or discordant with symptoms
• Pre-op coronary angiography in those with risk factors or age >40

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NATURAL HISTORY

• Long asymptomatic latent period (20–40 years in developed nations; can be as short as 5 years in developing nations)
• Once symptoms develop, untreated prognosis is poor:
  • NYHA II: 10-year survival 69%
  • NYHA III: 10-year survival 33%
  • NYHA IV: 10-year survival 0%
• MVA declines ~0.09 cm²/year on average
• Complications: AF (~30–40%), systemic embolism, pulmonary hypertension, RV failure

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MANAGEMENT

A. Medical Management

• Penicillin prophylaxis against Group A Strep (rheumatic fever secondary prevention) — lifelong in at-risk patients
• Infective endocarditis prophylaxis in high-risk patients

• Salt restriction + oral diuretics (loop diuretics: furosemide; thiazides) — reduce pulmonary congestion, relieve dyspnea
• Avoid strenuous exertion

• Beta-blockers (metoprolol, bisoprolol) — first line; also useful during pregnancy
• Non-DHP calcium channel blockers — verapamil, diltiazem
• Digoxin — useful in AF with heart failure, less effective for exercise-induced tachycardia

• Cardioversion (electrical or pharmacological) in recent-onset AF
• Requires ≥3 weeks of therapeutic anticoagulation (INR 2–3) OR TEE to exclude LA thrombus before cardioversion
• Less successful if LA markedly enlarged or AF >1 year

• Warfarin (Vitamin K antagonist), target INR 2–3 — indicated in:
  • MS + AF (paroxysmal or permanent)
  • Prior thromboembolism
  • LA thrombus on echo
• ⚠️ NOACs (e.g., rivaroxaban) are NOT recommended in rheumatic MS with AF — a randomized trial showed significantly higher mortality compared to warfarin (Harrison's 22nd Ed.)
• Controversial in sinus rhythm with LA >5.5 cm

Medical therapy relieves symptoms but does NOT correct the underlying mechanical obstruction. Definitive treatment requires intervention. — Fuster & Hurst's The Heart, 15th Ed.

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B. Interventional / Surgical Management

• Symptomatic (NYHA II–IV) severe MS (MVA <1.5 cm²)
• Asymptomal severe MS with new-onset AF, PAH (PASP >50 mmHg), or desire for pregnancy

• Procedure of choice when anatomy is favorable
• Technique: Inoue balloon inflated across mitral valve via transseptal puncture
• Contraindications: MVA >1.5 cm², LA thrombus, MR >grade 2, severe calcification (Wilkins score >8), significant commissural calcification
• Results: MVA doubles, mean gradient halves
• Complications: MR (~3%), tamponade (~1%), embolism (~1%), mortality (<1%)
• Long-term: 80–90% event-free survival at 5–7 years with favorable anatomy

• Open commissurotomy: direct visualization on cardiopulmonary bypass
• Preferred when BMV contraindicated but valve not too diseased for repair

• Indicated when leaflets too calcified/distorted for commissurotomy
• Options: mechanical valve (lifelong anticoagulation) vs. bioprosthetic valve
• Perioperative mortality: 1–3% (higher in older patients with PAH or LV dysfunction)
• Transcatheter mitral replacement (TMVR) under evaluation for degenerative MS/MAC

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Special Situations

• Physiological increases in HR and blood volume → may precipitate acute decompensation
• Beta-blockers are the mainstay for symptom control
• BMV is preferred intervention if needed; preferably after 20 weeks, with fetal lead shielding
• MVR carries high fetal risk

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COMPLICATIONS

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HOMEOPATHIC APPROACH TO MITRAL STENOSIS

Important clinical note: Homeopathy does not reverse structural valve stenosis or calcification. In the homeopathic framework, remedies are selected based on individualization — matching the totality of physical, mental, and general symptoms of the patient (not just the disease label). Homeopathic care is considered supportive/complementary; all patients with moderate-to-severe MS must receive conventional cardiological management.

Commonly Indicated Homeopathic Remedies

Repertory References for Valvular Disease

• Circulatory system – valvular disease: Acon., Adon. v., Apoc., Ars., Ars. iod., Aur. br., Aur. iod., Aur. m., Cact., Calc. fl., Camph., Conv., Crat., Dig., Ferr., Galanth., Glon., Iod., Kal., Lach., Laur., Lith. c., Lycop., Naja, Ox. ac., Phos., Plumb., Rhus. t., Sang., Serum ang., Spig., Spong., Stigm., Stroph., Thyr., Viscum.

Homeopathic Principles Applied to MS

1. Individualization — Remedy selection is based on the complete symptom picture (mental, general, local), not on the diagnosis alone
2. Miasmatic understanding — Rheumatic MS is viewed through the Psora-Sycosis-Syphilis miasmatic framework; Sycotic and Syphilitic miasms often implicated in structural degeneration
3. Constitutional remedies — A deep-acting constitutional remedy (e.g., Aurum met., Calc. carb., Lycopodium) may be indicated for the underlying predisposition
4. Organotropic remedies — Naja, Digitalis, Cactus, Crataegus are considered specific to the heart
5. Intercurrent / Anti-miasmatic remedies — Medorrhinum, Syphilinum, Tuberculinum may be needed intercurrently

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SUMMARY TABLE

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• Harrison's Principles of Internal Medicine, 22nd Ed. (2025) — Management, physical findings, treatment algorithm
• Fuster & Hurst's The Heart, 15th Ed. — Etiology, pathophysiology, natural history, BMV
• Braunwald's Heart Disease, 10th Ed. — Pathology, diagnosis, treatment
• Homeobook.com / Hpathy.com — Homoeopathic management (Dr. Naziya G.M. Naik; Dr. Manisha Sachdeva)

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🃏 AORTIC REGURGITATION — FLASHCARD

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CARD 1 — DEFINITION & BASICS

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CARD 2 — ETIOLOGY

Valve Leaflet Causes

Aortic Root Causes

Acute AR causes: Endocarditis + Aortic Dissection (remember: "E-D")

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CARD 3 — PATHOPHYSIOLOGY

Chronic AR (Compensated → Decompensated)

Incompetent aortic valve
        ↓
LV receives normal LA inflow + regurgitant volume
        ↓
Volume overload → Eccentric LV hypertrophy (LV dilates)
        ↓
↑ Stroke volume → ↑ Systolic BP → Wide pulse pressure
        ↓
Afterload excess → Concentric + eccentric hypertrophy
        ↓ (years later)
LV systolic dysfunction → Heart failure symptoms

Acute AR (Decompensated from the start)

• No time for LV compensation → sudden ↑ LVEDP
• ↓ Cardiac output + ↑ pulmonary pressure → Pulmonary oedema + shock
• Reflex vasoconstriction raises SVR (makes it worse)
• Medical emergency — early surgery needed

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CARD 4 — SYMPTOMS

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CARD 5 — PERIPHERAL SIGNS (The Famous Eponyms)

Mnemonic: "WCDQ-MT" — Water hammer, Corrigan, De Musset, Quincke, Müller, Traube

All these signs reflect the wide pulse pressure and hyperdynamic circulation from the high stroke volume.

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CARD 6 — CARDIAC EXAMINATION

In acute AR: murmur is short and soft (LV pressure rises rapidly, equalizes with aorta early in diastole) — easily missed!

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CARD 7 — INVESTIGATIONS

ECG

• LV hypertrophy pattern (tall R in V5–V6, deep S in V1–V2)
• Left axis deviation
• ST-T changes (strain pattern)
• Normal in early/mild AR

Chest X-Ray

• Cardiomegaly — enlarged LV ("boot-shaped" or globular heart)
• Aortic root dilation (prominent aortic knuckle)
• In acute AR: pulmonary oedema with near-normal heart size

Echocardiography (Gold Standard)

• 2D: LV dilation, LV function, aortic root size, leaflet morphology, vegetations
• Colour Doppler: regurgitant jet width/area in LVOT
• Vena contracta ≥6 mm → severe AR
• Holodiastolic flow reversal in descending/abdominal aorta → severe AR
• Pressure half-time (PHT) <200 ms → severe AR (rapid equalization)
• LV dimensions: LVESD >50 mm or LVEDD >65 mm → surgical threshold

Cardiac Catheterization

• Aortography when echo is inconclusive
• Coronary angiography pre-op (age >40 or risk factors)

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CARD 8 — SEVERITY GRADING

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CARD 9 — MANAGEMENT

Acute AR — Emergency

1. IV vasodilators (sodium nitroprusside) + inotropes (dobutamine)
2. No IABP (contraindicated — worsens regurgitation in diastole)
3. Urgent/Emergency aortic valve replacement (AVR) — medical management alone = high mortality
4. Treat underlying cause (antibiotics for endocarditis, surgery for dissection)

Chronic AR — Medical

Note: Vasodilators reduce afterload, decrease regurgitant volume and are the cornerstone of medical management. — Goldman-Cecil Medicine

Chronic AR — Surgical: Indications for AVR (AHA/ACC)

Valve replacement should occur before irreversible ventricular dysfunction — serial echo surveillance is key. — Fuster & Hurst's The Heart, 15th Ed.

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CARD 10 — ACUTE vs. CHRONIC: QUICK COMPARISON

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CARD 11 — KEY MNEMONICS

• Congenital (bicuspid), Rheumatic, Endocarditis, Ankylosing spondylitis, Marfan's
• Marfan, Hypertension, Syphilis, Aortic dissection, Idiopathic

• Water hammer, Corrigan, De Musset, Quincke, Traube, Müller, Becker

Austin Flint = no Opening Snap, no LA enlargement, no P-mitrale on ECG

AR = After S2 → At Left Lower Sternal Border = "A-LLSB"

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