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Mitral valve regurgitation long question

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"mitral regurgitation"[MeSH Terms] AND management

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Mitral Valve Regurgitation (MR) - Comprehensive Review

1. Definition and Epidemiology

Mitral regurgitation (MR) is the systolic backflow of blood from the left ventricle (LV) into the left atrium (LA) due to incomplete closure of the mitral valve. It is, together with aortic stenosis, the most frequent valvular heart disease in the general population, with an estimated prevalence of approximately 20% when mild forms are included.
  • In the OxVALVE Population Cohort Study (n = 2,500 patients aged ≥65 years), 19.8% had mild MR and 2.3% had moderate-to-severe MR.
  • Prevalence is strongly age-related: >10% of individuals aged ≥75 years have at least moderate MR.
  • MR prevalence is expected to double before 2050 as the population ages.
  • 5-year survival in untreated significant MR: 66 ± 3% in primary MR and 46 ± 3% in secondary MR.
  • Fuster and Hurst's The Heart, 15th Ed.

2. Anatomy of the Mitral Valve Apparatus

The mitral valve is a complex structure with five components, each of which can contribute to MR if dysfunctional:
ComponentDescription
Mitral annulusFibrous ring; saddle-shaped; contracts ~25% during systole to aid coaptation
Anterior leafletLarger; 3 scallops: A1 (lateral), A2 (central), A3 (medial)
Posterior leafletSmaller; 3 scallops: P1 (lateral), P2 (central), P3 (medial)
Chordae tendineaePrimary (leaflet tips), secondary (mid leaflet), tertiary (leaflet base)
Papillary musclesAnterolateral and posteromedial - insert directly into the LV wall
The two commissures are the anterolateral and posteromedial commissures. Unlike the aortic valve, dysfunction of ANY component of this apparatus can produce MR, which explains the heterogeneity of causes.
  • Fuster and Hurst's The Heart, 15th Ed.

3. Classification

MR is classified by two main systems: etiology and chronicity.

3a. By Etiology

Primary (Organic/Degenerative) MR

  • Caused by intrinsic abnormalities of the valve leaflets or subvalvular apparatus
  • Leaflets are the primary site of pathology

Secondary (Functional) MR

  • Valve leaflets are structurally normal
  • MR results from LV or LA geometric distortion causing poor leaflet coaptation
  • Two subtypes:
    • Ventricular secondary MR: LV dilatation/dysfunction (ischemic cardiomyopathy, dilated cardiomyopathy) causes apical displacement of papillary muscles, tethering the leaflets apically
    • Atrial secondary MR: LA enlargement causes annular dilatation without LV involvement

3b. By Chronicity

  • Acute MR: Sudden onset, poorly tolerated; hemodynamically catastrophic
  • Chronic MR: Develops slowly; allows cardiac compensation for prolonged periods

3c. Carpentier Functional Classification (Mechanism-based)

TypeLeaflet MotionMechanism
Type INormalAnnular dilatation or leaflet perforation
Type IIExcessive (prolapse/flail)Chordal elongation/rupture, papillary muscle elongation/rupture
Type IIIaRestricted (systole + diastole)Rheumatic disease, calcification
Type IIIbRestricted (systole only)Ischemic/dilated cardiomyopathy (papillary muscle tethering)

4. Etiology / Causes

Bailey and Love's table of causes:
CategorySpecific Causes
DegenerativeBarlow's disease (myxomatous degeneration), fibromuscular dysplasia, Marfan syndrome, Ehlers-Danlos syndrome, mitral valve prolapse, annular/leaflet calcification
VentricularPapillary muscle rupture post-MI, transient ischemia, cardiomyopathy with annular dilatation
Autoimmune/InfectiveRheumatic heart disease (post-streptococcal), infective endocarditis
OtherTrauma, congenital (isolated mitral cleft), ergotamine-containing drugs, radiotherapy
Most common cause overall: Myxomatous degeneration (in developed countries)
In older adults (age ≥75), myxomatous degeneration remains the most frequent structural cause; functional MR due to chronic LV/annular dilation or ischemic papillary muscle dysfunction is also very common.
  • Bailey and Love's Surgery, 28th Ed.; Braunwald's Heart Disease

5. Pathophysiology

The pathophysiology is best understood by dividing it into acute and chronic (compensated → decompensated) phases.
MR pathophysiology diagram showing pressure relationships and regurgitant jets
Features and pathophysiology of MR. The left ventricle ejects blood both forward (120/80 mmHg aorta) and backward into the left atrium (low impedance), causing LA enlargement and a holosystolic murmur. - Bailey and Love's Surgery, 28th Ed.
Normal heart diagram showing baseline EDV, ESV and LA pressure
Normal cardiac volumes for comparison: EDV 150 mL, ESV 50 mL, LA pressure 10 mmHg. - Goldman-Cecil Medicine

Phase 1: Acute MR

  • Sudden regurgitation into a small, non-compliant LA creates abrupt rise in LA pressure
  • LV is volume overloaded; Frank-Starling mechanism is maximized
  • LV end-diastolic volume (EDV) increases; end-systolic volume (ESV) decreases
  • Total stroke volume rises but forward stroke volume is subnormal (large fraction regurgitates)
  • Result: Pulmonary edema + low cardiac output despite preserved or hyperdynamic LV function
  • EF is often elevated (>70%) due to reduced afterload - does NOT indicate normal LV function
  • Clinical emergency: papillary muscle rupture, acute endocarditis, ruptured chordae

Phase 2: Chronic Compensated MR

  • Eccentric LV hypertrophy (sarcomere replication in series) + LA enlargement allow accommodation
  • LV EDV is markedly increased; EF remains normal to elevated
  • Forward stroke volume normalizes
  • Patient may remain asymptomatic for years to decades
  • LA enlargement reduces LA pressure despite large regurgitant volume

Phase 3: Chronic Decompensated MR

  • Progressive LV dysfunction (sarcomere dysfunction, wall stress normalization fails)
  • EF falls below normal; end-systolic dimensions increase
  • Symptoms emerge: dyspnea, fatigue, orthopnea
  • Key insight: In MR, EF is artificially elevated due to the low-impedance regurgitant pathway. An EF of 55-60% may represent significant myocardial dysfunction in this context.
  • Pulmonary hypertension (secondary PH) develops, progressing to right heart failure
  • Goldman-Cecil Medicine; Braunwald's Heart Disease; Bailey and Love's Surgery

6. Clinical Features

Symptoms

TypeSymptoms
Acute MRSudden dyspnea, orthopnea, pulmonary edema, cardiogenic shock
Chronic compensatedOften asymptomatic for years; exercise intolerance may develop
Chronic decompensatedDyspnea on exertion, orthopnea, paroxysmal nocturnal dyspnea, fatigue, palpitations (AF), peripheral edema (right heart failure)

Signs - Physical Examination

FindingDescription
Apex beatDisplaced, laterally displaced hyperdynamic apical impulse; LV enlargement
S1Soft or absent (incomplete mitral closure)
S3 gallopPresent in significant MR (volume overload)
P2Loud if pulmonary hypertension develops
MurmurHolosystolic (pansystolic), best heard at the apex, radiates to the axilla (posterior leaflet prolapse) or to the left sternal border (anterior leaflet prolapse)
CharacterBlowing, high-pitched
Effect of ValsalvaDecreases (unlike MVP click-murmur which moves earlier)
Effect of squattingIncreases (increased preload)
Mitral Valve Prolapse murmur specifics: Mid-systolic click followed by a late systolic murmur. The click moves:
  • Earlier with Valsalva, standing (reduced preload, smaller LV)
  • Later with squatting, leg raising (increased preload, larger LV)

7. Investigations

Electrocardiography

  • P-mitrale (broad, notched P-wave) - LA enlargement
  • Atrial fibrillation (very common in chronic MR)
  • Left ventricular hypertrophy (tall R waves, lateral strain pattern)
  • Broad QRS if concomitant LBBB

Chest X-Ray

  • Cardiomegaly (LA + LV enlargement)
  • Double shadow of enlarged LA on PA view
  • Splaying of carina (LA enlargement pushes left main bronchus upward)
  • Pulmonary vascular congestion or frank pulmonary edema in decompensated MR

Echocardiography (Gold Standard)

Transthoracic Echocardiography (TTE) is the primary tool:
  1. 2D echo: Identifies leaflet anatomy, mechanism, LV/LA dimensions, EF
  2. Color flow Doppler: Visualizes regurgitant jet (direction, extent in LA)
  3. Proximal Isovelocity Surface Area (PISA) method: Calculates effective regurgitant orifice area (EROA) and regurgitant volume
  4. 3D echo: More accurate EROA, especially for secondary/crescentic orifice MR
Grading Severity of MR:
ParameterMildModerateSevere
Jet area (% LA area)<20%20-40%>40%
Vena contracta width<0.3 cm0.3-0.69 cm≥0.7 cm
EROA (primary MR)<0.2 cm²0.2-0.39 cm²≥0.4 cm²
Regurgitant volume<30 mL30-59 mL≥60 mL
Regurgitant fraction<30%30-49%≥50%
Secondary MR caveat: EROA ≥0.3 cm² (not 0.4 cm²) can denote severe MR due to the crescent-shaped orifice underestimated by PISA. Regurgitant volume ≥45 mL/beat may indicate severe secondary MR in low-flow states.
Transesophageal Echocardiography (TEE): Mandatory before surgical or transcatheter intervention; provides precise leaflet anatomy for repair planning.

Cardiac MRI (CMR)

  • Ideal for quantification of regurgitant volume when echo is suboptimal
  • Directly measures regurgitant volume or calculates it as difference between LV stroke volume and aortic forward flow

Cardiac CT

  • Used when transcatheter mitral valve repair/replacement is being considered
  • Provides detailed annular anatomy, annular calcification burden, and access route planning
  • Fuster and Hurst's The Heart, 15th Ed.; Harrison's Principles of Internal Medicine, 22E

8. Management

8a. Medical Therapy

Acute MR:
  • Emergency stabilization: IV vasodilators (sodium nitroprusside) to reduce afterload and regurgitant fraction
  • Intra-aortic balloon pump (IABP) in cardiogenic shock (reduces afterload, increases forward output)
  • Emergency surgery for papillary muscle rupture
Chronic Primary MR:
  • No proven benefit of vasodilators (ACE inhibitors, ARBs) in asymptomatic patients with normal LV function - unlike aortic regurgitation
  • ACE inhibitors/ARBs and beta-blockers are used if AF or hypertension co-exists
  • Diuretics for symptom relief in decompensated disease
  • Rate/rhythm control for atrial fibrillation; anticoagulation for AF
Chronic Secondary MR:
  • Treat underlying cause (heart failure management: ACEi/ARB/ARNI, beta-blockers, mineralocorticoid antagonists, SGLT2 inhibitors per GDMT)
  • Cardiac resynchronization therapy (CRT/CRT-D) when indicated - can significantly reduce functional MR
  • Diuretics for congestion

8b. Surgical Indications (Primary MR - ACC/AHA 2020/2021 Guidelines)

IndicationRecommendation
Symptomatic severe MR with preserved LV functionClass I (surgery recommended)
Asymptomatic severe MR + LVEF ≤60%Class I
Asymptomatic severe MR + LVESD ≥40 mmClass I
Asymptomatic severe MR + new onset AF or resting PASP >50 mmHgClass IIa
Asymptomatic severe MR + normal LV function + high likelihood of durable repairClass IIa
Repair vs. Replacement:
  • Mitral valve repair is preferred over replacement whenever technically feasible
  • Repair preserves annulopapillary continuity, maintains LV geometry, and avoids prosthesis-related complications
  • Operative mortality: ~1-3% for repair at experienced centers vs. ~5-10% for replacement

8c. Surgical Techniques

Annuloplasty - core of virtually every repair:
  • Prosthetic ring restores normal saddle shape; prevents progressive annular dilatation
  • Sized based on anterior leaflet surface area
Additional repair techniques (for primary MR):
  • Chordal replacement (PTFE neochords or "loops")
  • Chordal transfer
  • Triangular or quadrangular leaflet resection
  • Cleft closure
  • Leaflet augmentation with pericardial patches
  • Focal calcium resection
  • Commissural plication (edge-to-edge sutures)
Mitral Valve Replacement (MVR):
  • Required when leaflets are heavily calcified, fused, or fibrotic (Carpentier Type IIIa)
  • Bioprosthetic valves: No anticoagulation needed (after 3 months); degenerate over time (10-15 years); preferred in elderly
  • Mechanical valves: Lifelong anticoagulation required; more durable
  • Fuster and Hurst's The Heart, 15th Ed.; Goldman-Cecil Medicine; Braunwald's Heart Disease

9. Transcatheter Interventions

Transcatheter Edge-to-Edge Repair (TEER) - MitraClip / PASCAL

  • Replicates the Alfieri stitch: clips the mid-scallops of the anterior (A2) and posterior (P2) leaflets together, creating a double-orifice mitral valve
  • Performed via transseptal approach from the right femoral vein using a 24F sheath under TEE guidance
  • FDA-approved for:
    1. Primary MR in patients with prohibitive surgical risk (EVEREST I/II trials)
    2. Secondary MR in heart failure patients with LV dysfunction despite optimal GDMT (COAPT trial)
COAPT trial (Stone CW, 2018): Transcatheter MV repair in HF patients with secondary MR resulted in lower HF hospitalization and all-cause mortality over 24 months vs. medical therapy alone.
MITRA-FR trial (Obadia JF, 2018): No significant benefit of TEER over medical therapy in secondary MR - differences between the two trials related to patient selection (COAPT selected patients where MR was "proportionate" with reduced LV dysfunction, MITRA-FR selected "disproportionate" MR patients with more severe LV dysfunction).
Advantages: Less invasive; suitable for high-risk/inoperable patients; improvement in NYHA class and QOL
Limitations: Single-structure repair; not suitable for all valve anatomies

Other Transcatheter Approaches

  • Annuloplasty devices (direct or indirect)
  • Transcatheter Mitral Valve Replacement (TMVR): Emerging; for patients unsuitable for repair
  • Braunwald's Heart Disease; Fuster and Hurst's The Heart, 15th Ed.

10. Complications of Untreated MR

ComplicationMechanism
Atrial fibrillationLA dilatation; very common; worsens prognosis
Heart failureProgressive LV dysfunction
Pulmonary hypertensionChronic elevation of pulmonary venous pressure
Right heart failureSecondary to PH
ThromboembolismStasis in dilated LA, especially with AF
Infective endocarditisAbnormal leaflets provide nidus for infection
Sudden cardiac deathRare; more common in MVP with specific high-risk features

11. Prognosis and Surveillance

  • Untreated severe symptomatic MR: poor prognosis with 5-year mortality ~50%
  • Successful valve repair before LV dysfunction: near-normal life expectancy
  • Key thresholds for surgery: LVEF ≤60% and/or LVESD ≥40 mm - identify the "point of no return"
  • Asymptomatic severe MR with normal LV function: yearly history, physical examination, and echocardiography
  • BNP/NT-proBNP elevation and deterioration of global longitudinal strain (GLS) on echo are additional early markers suggesting earlier intervention

12. Special Situations

Acute MR from Papillary Muscle Rupture (Post-MI)

  • Occurs in 1% of MIs; typically posteromedial papillary muscle (single blood supply from RCA)
  • Presents 2-7 days after MI with acute pulmonary edema and cardiogenic shock
  • Physical exam: new, loud holosystolic murmur (may be soft if output very low)
  • Emergent surgical MVR with resection of damaged muscle and infarct zone is treatment of choice

Mitral Valve Prolapse (MVP)

  • Most common cause of primary MR in developed countries
  • Myxomatous degeneration causing leaflet billowing >2 mm behind mitral annular plane into LA
  • More common in women (younger presentation); balanced sex distribution in older adults
  • Auscultation: mid-systolic click + late systolic murmur; click moves with preload changes
  • High-risk MVP features: bileaflet prolapse, mitral annular disjunction, T-wave inversion in inferior leads, complex ventricular ectopy - associated with sudden cardiac death risk

Rheumatic MR

  • Results from fusion and thickening of leaflet tips with commissural fusion (Type IIIa)
  • Often coexists with mitral stenosis
  • Prevalent in developing countries; rare in developed nations

Summary Table

FeatureAcute MRChronic CompensatedChronic Decompensated
LV EDVSlightly increasedMarkedly increasedMarkedly increased
LV ESVDecreasedNormalIncreased
LV EFIncreasedNormal-increasedDecreased (<60%)
LA pressureMarkedly elevatedNormal/mildly elevatedElevated
LA sizeNormalEnlargedEnlarged
SymptomsPulmonary edema, shockAsymptomaticDyspnea, fatigue, HF
ManagementEmergency surgery/stabilizeWatchful waitingSurgery indicated
Sources:
  • Fuster and Hurst's The Heart, 15th Ed. - Chapter 30 (primary and secondary MR, epidemiology, guidelines)
  • Goldman-Cecil Medicine - Chapter 60 (pathophysiology phases, surgical indications)
  • Braunwald's Heart Disease - Chapters 76, 78 (transcatheter therapy, management)
  • Bailey and Love's Short Practice of Surgery, 28th Ed. - Chapter 59 (causes table, pathophysiology)
  • Harrison's Principles of Internal Medicine, 22E - Chapter 248 (echocardiographic assessment)

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Manthappa medicine textbook India medical students

"Manthappa Medicine" refers to the Manipal Prep Manual of Medicine by Dr. M. Manthappa, a very popular exam-oriented medicine textbook among Indian MBBS students. It is nicknamed "Manthappa" after its author.

About the Book

DetailInfo
Full TitleManipal Prep Manual of Medicine
AuthorDr. M. Manthappa
PublisherCBS Publishers and Distributors
Latest Edition4th Edition (2026)
FormatQ&A / concise exam-focused
Also availableDental students' edition

What Makes It Popular

  • Written in a concise Q&A format, ideal for exam preparation (final MBBS, PG entrance exams like NEET-PG, USMLE-style)
  • Covers all major topics in internal medicine in an easy-to-read, actionable style
  • Widely used across Indian medical colleges, especially Manipal and affiliated institutions
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Harrison's Principles of Internal Medicine, 22e (2025)Comprehensive concepts, mechanisms
Goldman-Cecil Medicine (2-Vol)Clinical, exam-relevant
The Washington Manual of Medical TherapeuticsConcise, practical management
Symptom to Diagnosis (4e)Evidence-based clinical reasoning
Frameworks for Internal MedicineStructured approach
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