Valvular Heart Disease

Slide 1 · Valvular heart disease

Mechanisms, consequences and acquired causes

Opening

Closure

Forward / reverse flow

Dr Abu Suraih Sakhri

MBBS, MD (Pathology)

www.abusuraihsakhri.com

Slide 2 · The teaching scope: Mechanism before lesion name

Identify stenosis, insufficiency, and coexistence of both lesions.

Localize disease to leaflets or valve-supporting structures.

Relate valve dysfunction to murmurs, remodeling and heart failure.

Compare the acquired causes of major mitral and aortic lesions.

Valve function

Anatomic substrate

Clinical effects

Slide 3 · Two fundamental valve failure modes

Stenosis: Incomplete opening obstructs forward blood flow.

Insufficiency: Incomplete closure permits backward blood flow.

The same valve can exhibit stenosis and insufficiency together.

OPENING FAILURE

Restricted forward flow

CLOSURE FAILURE

Backward regurgitant flow

Slide 4 · Valve competence requires two distinct actions

During forward flow, adequate valve opening avoids mechanical obstruction.

When the valve closes, leaflet coaptation prevents backflow.

An opening defect and a closure defect therefore produce different lesions.

Open fully

Forward flow

Close fully

Prevent backflow

Slide 5 · Stenosis is failure of complete opening

Obstruction arises at the narrowed valvular orifice.

The primary flow defect is reduced forward passage through the valve.

This mechanism is distinct from leakage through an incompletely closed valve.

Incomplete opening

Outflow obstruction

Pressure overload

Slide 6 · Acquired stenosis is generally leaflet-based

Acquired stenosis is almost always associated with a primary leaflet abnormality.

The lesion is typically a chronic process, not an abrupt failure of support.

Calcification and valve scarring are representative leaflet mechanisms.

Leaflet injury

Structural change

Restricted opening

Slide 7 · Calcification can restrict leaflet mobility

Calcific change is identified as a cause of acquired valve narrowing.

Calcific aortic disease can involve anatomically normal or congenitally bicuspid valves.

The detailed pathology of calcific aortic stenosis belongs to a separate disease topic.

Calcific leaflet change

Reduced excursion

Stenosis

Slide 8 · Scarring can also restrict leaflet opening

Postinflammatory scarring is a major acquired cause of mitral stenosis.

Rheumatic heart disease is the named example in the etiology table.

Scarring illustrates delayed stenosis after previous valve injury.

Previous inflammation

Leaflet scarring

Fixed obstruction

Slide 9 · Stenosis: Obstruction rather than backflow

A stenotic valve does not achieve full excursion during opening.

The consequence is impeded forward movement of blood.

Any coexisting regurgitation is a second, separately described functional defect.

STENOSIS

Opening incomplete → forward obstruction

REGURGITATION

Closure incomplete → reverse flow

Slide 10 · Insufficiency is failure of complete closure

Insufficiency, regurgitation and incompetence are synonymous terms in this context.

Failure of coaptation permits flow in the reverse direction.

Closure failure can develop from intrinsic leaflet injury or an altered support apparatus.

Incomplete closure

Regurgitant flow

Volume overload

Slide 11 · Primary leaflet injury can cause insufficiency

Damage to the valve leaflets may directly impair closure.

Infective endocarditis is an example of intrinsic leaflet disease.

Inflammatory scarring can also cause leaflet retraction and progressive incompetence.

Intrinsic leaflet lesion

Failed coaptation

Regurgitation

Slide 12 · The support apparatus matters even with intact leaflets

Regurgitation does not require a primary lesion of the leaflet tissue.

Abnormalities may involve the aorta, annulus, chordae, papillary muscles or ventricle.

The site of disruption must be identified separately from the direction of blood flow.

Leaflets

Supporting structures

Regurgitant flow

Slide 13 · Supporting structures form a functional system

The mitral annulus provides a structural attachment for the valve.

Tendinous cords and papillary muscles are part of the valve tensor apparatus.

The ventricular free wall and aortic root can affect valve competence.

Annulus / root

Chordae / papillary muscles

Chamber geometry

Valve closure

Slide 14 · Chordal rupture: Abrupt mechanical incompetence

Tendinous cord rupture is explicitly cited as an acute cause of insufficiency.

The initiating defect lies in the tensor apparatus rather than necessarily in a leaflet.

The important mechanistic feature is sudden loss of competent closure.

Ruptured chordae

Unstable leaflet support

Acute regurgitation

Slide 15 · Papillary muscle pathology can impair valve closure

Rupture of a papillary muscle appears among causes of mitral regurgitation.

Papillary muscle dysfunction from fibrosis is another listed mechanism.

Both illustrate how tensor-apparatus damage creates functional insufficiency.

STRUCTURAL DISRUPTION

Papillary muscle rupture

FUNCTIONAL DYSFUNCTION

Papillary muscle fibrosis

Slide 16 · Ventricular geometry can alter valve competence

Left ventricular enlargement is a cause of mitral regurgitation.

The table associates enlargement with myocarditis and dilated cardiomyopathy.

Thus, a myocardial disorder can produce valvular incompetence without primary leaflet injury.

Left ventricular enlargement

Distorted support / annulus

Mitral insufficiency

Slide 17 · Aortic disease can produce valve insufficiency

The aorta is listed among structures capable of causing valve incompetence.

Ascending aortic dilation is a frequent setting for aortic insufficiency.

This is an extravalvular mechanism, distinct from intrinsic cusp damage.

Aortic dilation

Impaired closure geometry

Aortic regurgitation

Slide 18 · Leaflet lesions and support lesions are distinct

Intrinsic valve disease modifies the leaflets themselves.

Support failure alters the structures needed for effective closure.

Both pathways can converge on insufficiency despite different morphologic targets.

INTRINSIC PATHWAY

Leaflet disease → incomplete closure

EXTRINSIC PATHWAY

Support distortion → incomplete closure

Slide 19 · Regurgitation may start abruptly or insidiously

Insufficiency can be acute after structural failure.

It may emerge gradually after chronic valve scarring and retraction.

Rate of onset is a major determinant of clinical consequences.

ABRUPT

Chordal rupture

GRADUAL

Scarring and retraction

Slide 20 · Acute mechanical failure: Loss of closure at once

Chordal rupture represents a sudden disturbance of support.

The regurgitant lesion may appear with little opportunity for prolonged adaptation.

Such abrupt lesions with slowly developing valvular disease.

Support intact

Sudden rupture

Immediate incompetence

Slide 21 · Chronic leaflet scarring: Progressive incompetence

Scarring and retraction can gradually undermine leaflet closure.

The change can evolve over time rather than presenting as a sudden lesion.

Slow tempo permits a different degree of compensation than acute valve injury.

Prior leaflet injury

Fibrosis / retraction

Progressive leak

Slide 22 · Stenosis and insufficiency may coexist

The two defects are not mutually exclusive within a diseased valve.

A valve can both open inadequately and close incompletely.

Describing a lesion requires specifying each present functional abnormality.

Restricted opening

Same diseased valve

Incomplete closure

Slide 23 · Disease may affect one valve or several

Valvular disease may involve an isolated valve.

Alternatively, more than one valve can be abnormal.

Evaluation should record both the number of affected valves and their lesion types.

SINGLE VALVE

One valve with stenosis and/or insufficiency

MULTIPLE VALVES

More than one diseased valve

Slide 24 · The mitral valve is a frequent target

The general Robbins discussion identifies the mitral valve as the most commonly affected.

Its lesions include stenosis and regurgitation arising from different etiologies.

Frequency of involvement does not identify the cause in an individual lesion.

Mitral stenosis

Mitral regurgitation

Varied underlying causes

Slide 25 · Describe a valve disorder on three axes

Functional axis: Stenosis, insufficiency or both.

Anatomic axis: Leaflet versus support apparatus / adjacent tissue.

Distribution axis: A single valve versus multivalvular disease.

Function

Opening / closure

Substrate

Leaflet / support

Distribution

Single / multiple

Slide 26 · Abnormal valve flow commonly creates a murmur

Diseased valves generate abnormal patterns of blood flow.

The resulting abnormal heart sounds are termed murmurs.

The clinical examination therefore reflects a functional disturbance in flow.

Abnormal valve flow

Audible turbulence

Murmur

Slide 27 · A thrill is a palpable manifestation of severe disturbance

Severe valvular lesions may produce externally palpable thrills.

A thrill is a physical finding in addition to an audible murmur.

The text describes this as a feature of severe lesions, not a property of every valve disease.

Severe valve lesion

Marked flow disturbance

Palpable thrill

Slide 28 · Murmur location depends on the valve

Murmurs are not equally well heard at all chest-wall locations.

The optimal area varies according to the involved valve.

This localization contributes to bedside characterization of the lesion.

Valve involved

Chest-wall position

Best auscultation area

Slide 29 · Murmur quality reflects the lesion

The nature of valve dysfunction influences the sound generated.

Robbins explicitly contrasts harsh and soft murmur qualities.

The severity of dysfunction also contributes to the auscultatory character.

LESION TYPE

Stenosis versus regurgitation

LESION SEVERITY

Influences murmur quality

Slide 30 · Murmur timing is clinically informative

The text distinguishes systolic from diastolic murmurs.

Valve involved, type of dysfunction and severity determine the murmur pattern.

Timing and quality must be interpreted in relation to the suspected valvular lesion.

Identify valve

Assess timing

Assess quality

Integrate severity

Slide 31 · Physical findings reflect flow, not just anatomy

A morphologic lesion can have an audible hemodynamic expression.

Stenosis and regurgitation generate distinct types of flow disturbance.

Murmurs and thrills are clues that require anatomical and functional interpretation.

Structure

Flow abnormality

Murmur / thrill

Slide 32 · Clinical impact has four principal determinants

Which valve is diseased.

How severely the valve function is impaired.

How quickly the lesion develops.

How effectively and how rapidly the heart compensates.

Site

Affected valve

Magnitude

Degree of impairment

Tempo

Rate of onset

Adaptation

Quality of compensation

Slide 33 · Which valve is involved changes the consequences

Different valves occupy different positions within cardiac blood flow.

The clinical effects therefore vary by the valve involved.

A mechanism-based diagnosis first localizes the abnormal valve.

Valve location

Altered flow pathway

Clinical consequences

Slide 34 · Degree of impairment influences clinical effects

Valvular lesions range in the magnitude of functional obstruction or leak.

Impairment severity as a determinant of clinical outcomes.

Physical findings and secondary cardiac consequences must be considered together.

Degree of dysfunction

Altered cardiac load

Clinical consequence

Slide 35 · Tempo: Rapid and gradual lesions behave differently

Abrupt valve failure may cause major consequences before meaningful adaptation.

Gradual disease may be tolerated over extended intervals.

The same functional category can therefore vary in its immediate clinical expression.

RAPID ONSET

Little time for adaptation

SLOW ONSET

Longer period for compensation

Slide 36 · Compensation changes the clinical course

Clinical effects depend on both rate and effectiveness of compensation.

The heart may remodel in response to abnormal valvular loading.

However, compensatory changes do not guarantee that failure will be avoided.

Valve dysfunction

Compensatory change

Variable tolerance

Possible failure

Slide 37 · Acute valve destruction can be catastrophic

Destruction of an aortic cusp by infection as an example.

Acute, massive aortic regurgitation can follow abrupt cusp damage.

The described outcome may be rapidly fatal.

Infective cusp destruction

Acute aortic regurgitation

Rapid decompensation

Slide 38 · Rheumatic mitral stenosis exemplifies slow disease

Rheumatic mitral stenosis commonly develops gradually over years.

Its clinical effects can be tolerated for prolonged periods.

This example contrasts with sudden destructive valve incompetence.

Remote inflammation

Progressive stenosis

Prolonged tolerance

Slide 39 · Compare clinical tempo, not just lesion labels

A rapidly destructive lesion may have immediate severe consequences.

Chronic obstruction may allow a period of adaptation.

Tempo and compensation are essential elements of clinicopathologic interpretation.

ACUTE CUSP INJURY

Abrupt severe regurgitation; Potentially fatal

CHRONIC RHEUMATIC INJURY

Slow mitral stenosis; May be tolerated

Slide 40 · Pregnancy can unmask limited cardiac reserve

Pregnancy increases the output demands placed upon the heart.

These demands can exacerbate pre-existing valve dysfunction.

The source notes potential adverse maternal or fetal outcomes.

Increased output demand

Pre-existing valve disorder

Possible clinical deterioration

Slide 41 · Valve disease can remodel regions on both sides

Secondary changes may occur proximal to the affected valve.

Changes may also occur distal to the valve.

Myocardial remodeling is particularly important in clinically significant valvular disease.

Proximal tissue

Diseased valve

Distal tissue

Slide 42 · Stenosis produces pressure overload

A narrowed orifice creates resistance to forward ejection or passage.

The source associates valvular stenosis with pressure-overload hypertrophy.

Continued loading can ultimately contribute to heart failure.

Valvular stenosis

Pressure overload

Cardiac hypertrophy

Possible failure

Slide 43 · Insufficiency produces volume overload

Regurgitation returns blood in the reverse direction.

The source associates valvular insufficiency with volume overload.

Progressive loading may culminate in cardiac failure.

Valve incompetence

Backflow

Volume overload

Possible failure

Slide 44 · Pressure and volume overload are not interchangeable

Stenosis primarily changes pressure loading conditions.

Insufficiency primarily creates volume loading.

Both can remodel myocardium and converge on heart failure.

STENOSIS

Pressure overload → hypertrophy

INSUFFICIENCY

Volume overload → remodeling

Slide 45 · Heart failure is a shared downstream outcome

Both stenotic and regurgitant disease may progress to heart failure.

Initial compensatory responses can precede decompensation.

The presence of a murmur alone does not describe the full myocardial consequence.

Pressure overload

Myocardial response

Heart failure

Slide 46 · Stenotic jets are a second source of tissue injury

Narrowed valves can create very high-speed streams of blood.

These jets may strike the endothelium or endocardium.

Mechanical impact at the site of contact may injure these surfaces.

Narrowed valve

High-speed blood jet

Impact site injury

Slide 47 · High-speed jets can also damage erythrocytes

Robbins explicitly identifies significant hemolysis as a consequence of narrowed-valve jets.

This is a blood-cell consequence distinct from endothelial or endocardial injury.

It underscores that abnormal flow can injure tissue and circulating cells.

SURFACE EFFECT

Endothelial / endocardial damage

BLOOD EFFECT

Hemolysis

Slide 48 · Valve abnormalities may be congenital or acquired

The source distinguishes congenital lesions from acquired ones.

Congenital valve anatomy can predispose to later functional disease.

The present general lecture emphasizes mechanisms of acquired dysfunction.

CONGENITAL

Abnormal valve from development

ACQUIRED

Later injury or support alteration

Slide 49 · Acquired stenosis often declares itself years later

Remote or chronic leaflet injury may remain subclinical for an extended period.

Progressive anatomic restriction eventually produces stenosis.

This is why the history of injury and time course both matter.

Remote/chronic injury

Progressive leaflet damage

Delayed clinical stenosis

Slide 50 · Acquired insufficiency has several anatomic origins

Leaflet damage and supporting-structure dysfunction are both possible.

The aorta and mitral annulus are named supporting sites.

Chordae, papillary muscles and ventricular wall are additional sites.

Leaflet

Intrinsic tissue injury

Root / annulus

Altered attachment geometry

Tensor apparatus

Chordal / papillary damage

Ventricle

Distorted chamber structure

Slide 51 · Four common acquired lesion–cause pairs

AORTIC STENOSIS

Calcific changes of normal or congenitally bicuspid valves

AORTIC INSUFFICIENCY

Aortic dilation; Intrinsic cusp lesions

MITRAL STENOSIS

Postinflammatory rheumatic scarring

MITRAL INSUFFICIENCY

Myxomatous prolapse; Ventricular dilation; Other leaflet/support causes

Slide 52 · Acquired aortic stenosis: Etiologic map

Calcific change may affect an anatomically normal aortic valve.

A congenitally deformed / bicuspid valve can also calcify.

The etiology table additionally lists postinflammatory scarring.

Previously normal valve

Congenital valve deformity

Postinflammatory scar

Slide 53 · Acquired mitral stenosis: Inflammatory scarring

The etiology table identifies postinflammatory scarring as its mechanism.

Rheumatic heart disease is the disease example.

Mitral stenosis provides the benchmark for chronic, slow valve disease in the general text.

Rheumatic inflammation

Postinflammatory fibrosis

Mitral stenosis

Slide 54 · Aortic insufficiency: Intrinsic cusp disease

Postinflammatory scarring is an intrinsic valvular cause.

Infective endocarditis is another intrinsic valvular cause.

The same functional lesion can alternatively arise from aortic disease.

VALVE LEAFLETS

Rheumatic injury; Endocarditis

AORTIC STRUCTURE

Dilation and other aortic disorders

Slide 55 · Aortic insufficiency: Disease of the aorta

Degenerative aortic dilation is included in the etiologic table.

Syphilitic aortitis is separately named.

Ankylosing spondylitis, rheumatoid arthritis and Marfan syndrome are also listed.

Degenerative

Aortic dilation

Infectious

Syphilitic aortitis

Inflammatory

Ankylosing spondylitis / rheumatoid arthritis

Connective tissue

Marfan syndrome

Slide 56 · Mitral regurgitation: Leaflet and commissural disease

Postinflammatory scarring and infective endocarditis are listed.

Mitral valve prolapse represents another leaflet-related cause.

Drug-associated valvular fibrosis (fenfluramine–phentermine) appears in the source table.

Postinflammatory / infective

Mitral valve prolapse

Drug-associated fibrosis

Slide 57 · Mitral regurgitation: Tensor apparatus injury

Papillary muscle rupture can produce regurgitation.

Papillary muscle dysfunction from fibrosis is another listed cause.

Ruptured chordae tendineae can also cause mechanical valve incompetence.

Papillary rupture

Loss of tissue integrity

Papillary fibrosis

Muscle dysfunction

Chordal rupture

Loss of tethering

Slide 58 · Mitral regurgitation: Chamber and annular causes

Left ventricular enlargement is a listed cause.

Associated conditions include myocarditis and dilated cardiomyopathy.

Calcification of the mitral ring is separately listed in this etiologic category.

Left ventricular enlargement

Myocarditis / dilated cardiomyopathy

Mitral annular calcification

Slide 59 · Ventricular failure can generate a valve lesion

The etiologic table links mitral insufficiency with left ventricular enlargement.

The ventricular abnormality is the upstream structural condition.

This example prevents assuming that every regurgitant valve has primary leaflet disease.

Myocardial disorder

LV enlargement

Mitral incompetence

Slide 60 · Mitral annular calcification is etiologic context

Calcification of the mitral ring appears in the mitral regurgitation causes table.

This abnormality is categorized with chamber and annular mechanisms.

Its full morphology and clinical profile belong to a separately indexed topic.

Mitral ring calcification

Annular abnormality

Potential regurgitation

Slide 61 · The four major lesions have different dominant causes

AORTIC STENOSIS

Calcific changes of normal or congenitally bicuspid valves

AORTIC INSUFFICIENCY

Aortic dilation; Intrinsic cusp lesions

MITRAL STENOSIS

Postinflammatory rheumatic scarring

MITRAL INSUFFICIENCY

Myxomatous prolapse; Ventricular dilation; Other leaflet/support causes

Slide 62 · Calcific degeneration begins with repetitive stress

Heart valves undergo millions of cycles of opening and closing each year.

Cusp tissue deforms substantially during each contraction.

Cumulative stress can contribute to damage and calcific degeneration.

Repetitive cycles

Mechanical deformation

Cumulative injury

Calcification

Slide 63 · Valve hinge points are stress-sensitive

Mechanical stress is especially prominent at leaflet hinge points.

Repetitive motion concentrates deformation at these attachments.

The source links cumulative injury to clinically important dysfunction.

Hinge-point movement

Local cumulative stress

Valve degeneration

Slide 64 · Closed valves withstand substantial gradients

The source reports a transvalvular closed-phase gradient of approximately 120 mm Hg for the mitral valve.

The corresponding aortic-valve estimate is approximately 80 mm Hg.

These source figures illustrate the repetitive loading borne by delicate valvular tissue.

MITRAL VALVE

≈120 mm Hg in the closed phase

AORTIC VALVE

≈80 mm Hg in the closed phase

Slide 65 · Calcific degeneration and vascular risks overlap

Atherosclerotic risk factors are strongly associated with calcific valvular degeneration.

The association partly to shared aspects of injury.

This general relationship should not be mistaken for a complete account of calcific aortic stenosis.

Shared risk factors

Chronic valve injury

Calcific degeneration

Slide 66 · Separate mechanism, anatomic site and etiologic name

A functional label (regurgitation) does not identify the injured tissue.

An anatomic label (papillary muscle or cusp) does not by itself specify the clinical tempo.

A disease label (rheumatic or infective) provides causal context, not the whole hemodynamic description.

Function

Anatomic substrate

Etiology / tempo

Slide 67 · Clinical exercise: Intact cusps, significant regurgitation

Question: Can significant valve insufficiency occur without primary leaflet damage?

Identify at least three nonleaflet structures mentioned by Robbins.

Explain the shared consequence of their failure.

Intact leaflets

Support apparatus failure

Regurgitant flow

Slide 68 · Clinical exercise: Mechanistic resolution

Yes. The aorta, annulus, chordae, papillary muscles and ventricle are all possible sites.

Disruption or distortion can prevent complete leaflet closure.

This produces backward flow, even if primary leaflet injury is absent.

Nonleaflet lesion

Failure of coaptation

Insufficiency

Slide 69 · Clinical exercise: Two lesions, two loading states

Stenosis: Identify the initial flow defect and the dominant loading response.

Insufficiency: Identify the initial flow defect and the dominant loading response.

State the shared potential downstream outcome.

STENOSIS

Incomplete opening → ?

INSUFFICIENCY

Incomplete closure → ?

Slide 70 · Clinical exercise: Mechanistic resolution

Stenosis obstructs forward flow and creates pressure overload.

Insufficiency permits regurgitation and creates volume overload.

Both may produce secondary myocardial changes and progress to failure.

STENOSIS

Pressure overload; Hypertrophy

INSUFFICIENCY

Volume overload; Remodeling

Slide 71 · Synthesis: Four steps to interpret a valve lesion

Define the functional abnormality: Obstruction, regurgitation or both.

Localize the anatomic substrate: Leaflets versus support structures.

Characterize onset and expected compensatory response.

Connect the flow disturbance to murmurs, abnormal loading and possible failure.

Function

Anatomy

Tempo

Consequences

Slide 72 · Core reference

Robbins, Cotran & Kumar: Pathologic Basis of Disease, 11th edition (2026).