Pericardial Disease

Slide 1 · Pericardial Disease

Fluid accumulation · Inflammation · Fibrous constriction

Effusion

Hemodynamic consequences

Pericarditis

Exudative morphology

Constriction

Impaired diastolic filling

Dr Abu Suraih Sakhri

MBBS, MD (Pathology)

www.abusuraihsakhri.com

Slide 2 · Learning objectives

Distinguish effusion, hemopericardium, and inflammatory exudates.

Explain why rapid fluid accumulation causes tamponade.

Recognize major acute pericarditis patterns and their causes.

Relate chronic scarring to adhesive and constrictive disorders.

Slide 3 · Three dominant forms of pericardial injury

Fluid may occupy and distend the pericardial sac.

Inflammation alters serosal surfaces and exudate composition.

Organization and fibrosis may tether or encase the heart.

Fluid

Volume and rate

Inflammation

Nature of exudate

Fibrosis

Mechanical constraint

Schematic

Slide 4 · The pericardium: Functional compartments

Visceral and parietal pericardial surfaces surround a potential space.

The space normally contains only a small volume of fluid.

Disease affects surface, space, or surrounding fibrous envelope.

Heart

Parietal boundary

Potential pericardial space

Slide 5 · Normal fluid is less than 50 mL

Normal fluid is thin, clear, and straw-colored.

Accumulation of extra serous fluid is termed effusion.

Blood and pus define different pathologic contents.

Heart

Normal fluid: <50 mL

Slide 6 · Morphologic processes predict consequences

An expanding effusion may compress cardiac chambers.

Inflamed surfaces may produce pain and a friction rub.

A dense scar can restrict filling even without free fluid.

Compression

Impaired filling

Friction

Pain or rub

Constriction

Limited expansion

Schematic

Slide 7 · Etiology spans multiple clinical settings

Infection, immune reactions, and myocardial injury all contribute.

Renal disease, malignancy, and trauma are additional contexts.

Surgery and thoracic irradiation may initiate acute or chronic disease.

Infectious

Microbial agents

Immune

Systemic or reactive

Other

Infarction, uremia, trauma

Schematic

Slide 8 · The fluid, inflammation, and scar axes overlap

Serous effusion may coexist with inflammatory pericarditis.

Infection can produce purulent exudate followed by fibrosis.

Hemorrhage can create a rapidly dangerous pressure load.

Fluid

May accumulate

Inflammation

Changes surfaces

Scar

May follow healing

Schematic

Slide 9 · Classify a fluid-filled pericardial sac

Serous fluid: Pericardial effusion.

Blood: Hemopericardium.

Pus: Purulent pericarditis, indicating an infectious process.

Serous

Thin fluid

Effusion

Blood

Hemopericardium

Potential tamponade

Pus

Suppuration

Infection

Editable comparison

Slide 10 · The rate of fluid accumulation matters

Gradual distension permits time for pericardial remodeling.

A rapidly growing collection lacks that adaptive interval.

The same sac can tolerate different volumes at different rates.

Slow

Time for remodeling

Rapid

Little adaptation time

Schematic

Slide 11 · Slowly accumulating effusions permit adaptation

Chronic enlargement expands the accommodating pericardial envelope.

A substantial collection may have little hemodynamic impact.

Clinical significance cannot be inferred from volume alone.

Heart

Accumulated fluid

Slide 12 · Rapid accumulation risks tamponade

An acute collection of 200–300 mL may severely compromise filling.

Examples include blood from a ruptured myocardial infarct or aortic dissection.

Rapid compression can be fatal.

Heart

Rapid collection

Slide 13 · How tamponade develops

Rapid pericardial volume expansion raises external cardiac constraint.

Atria, venae cavae, and potentially ventricles are compressed.

Restricted filling reduces effective cardiac output.

Rapid fluid gain

Cardiac compression

Impaired filling

Schematic

Slide 14 · Thin-walled structures are vulnerable

The atria and venae cavae are specifically susceptible to pressure.

Ventricular filling may also become compromised.

The final common mechanism is impaired diastolic filling.

Early pressure targets

Atria / venae cavae

Advanced consequence

Ventricular filling impaired

Schematic

Slide 15 · Chronic effusion differs from acute hemopericardium

Chronic effusion: Available remodeling time.

Acute hemopericardium: Sudden pressure increase.

Interpret the clinical threat through rate, volume, and filling effect.

Gradual

Remodeling possible

Large volume tolerated

Acute

Minimal accommodation

Tamponade at lower volume

Editable comparison

Slide 16 · A globular heart shadow is a chronic clue

The text describes a globular cardiac silhouette on chest radiographs.

It may be the major finding with some chronic effusions below 500 mL.

A radiographic silhouette does not, by itself, establish tamponade.

Heart

Accumulated fluid

Slide 17 · Hemopericardium from catastrophic injury

Ruptured myocardial infarction and aortic dissection are cited examples.

Blood can enter the pericardial space rapidly.

The immediate danger is compression of the heart, not an inflammatory subtype.

Ruptured MI / dissection

Blood in sac

Tamponade

Schematic

Slide 18 · Volume thresholds require context

Less than 50 mL describes normal pericardial fluid.

200–300 mL is an example of potentially fatal rapid accumulation.

Less than 500 mL describes some slowly accumulating chronic effusions.

<50 mL

Normal fluid

200–300 mL

Rapid, dangerous example

<500 mL

Some chronic effusions

Schematic

Slide 19 · Pericarditis is inflammation of the sac

Cardiac, thoracic, and systemic disorders may initiate inflammation.

Direct neoplastic involvement and postoperative reactions also occur.

The exudate and tissue response help distinguish subtypes.

Heart

Slide 20 · Major infectious causes of pericarditis

Viruses and pyogenic bacteria are listed infectious agents.

Tuberculosis and fungal infections may yield chronic reactions.

Other parasites also appear in the etiologic classification.

Viral

Acute association

Pyogenic

Suppuration

TB / fungal

Can be chronic

Schematic

Slide 21 · Presumed immune-mediated settings

Rheumatic fever, systemic lupus erythematosus, and scleroderma.

Postcardiotomy and postinfarction Dressler syndrome.

Drug hypersensitivity reactions.

Systemic

SLE, rheumatic fever

Post-injury

Dressler, postcardiotomy

Other

Drug hypersensitivity

Schematic

Slide 22 · Other important etiologic contexts

Myocardial infarction and uremia.

Cardiac surgery, trauma, and radiation.

Neoplasia involving the pericardium.

Cardiac

MI or surgery

Systemic

Uremia

Exposure

Radiation / trauma

Schematic

Slide 23 · Morphologic classification of acute pericarditis

Serous: Relatively thin fluid and mild inflammation.

Fibrinous or serofibrinous: Fibrin admixed with exudate.

Purulent: Pus; Hemorrhagic: Blood mixed with inflammatory exudate.

Serous

Thin fluid

Fibrinous

Fibrin

Purulent

Pus

Schematic

Slide 24 · Serous pericarditis often reflects systemic disease

Rheumatic fever, SLE, and scleroderma are examples.

Uremia and tumors may also be associated.

The predominantly serous response may remain relatively mild.

Heart

Serous fluid

Slide 25 · An adjacent infection may begin as sterile serositis

Inflammation in nearby tissues can irritate the parietal serosa.

Bacterial pleuritis is an example of a contiguous source.

A sterile serous response may progress toward fibrinous or suppurative change.

Nearby inflammation

Serosal irritation

Sterile effusion

Schematic

Slide 26 · Viral illness may precede pericarditis

A respiratory, pulmonary, or parotid infection may be the initial focus.

A primary viral pericarditis occurs less frequently.

Associated myocarditis is possible: Myopericarditis.

Viral illness

Pericardial inflammation

Myopericarditis

Schematic

Slide 27 · Tumors can cause serous pericarditis

Lymphatic invasion may disrupt pericardial function.

Direct contiguous spread is another mechanism.

Effusions associated with metastases may contain neoplastic cells.

Tumor extension

Pericardial involvement

Effusion ± cells

Schematic

Slide 28 · Serous pericarditis: Microscopic response

The epicardial fat may contain a mild inflammatory infiltrate.

Lymphocytes predominate in the described histology.

Prominent fibrous adhesions are unusual in this pattern.

Epipericardial fat

Mild lymphocytes

Pericardial space

Serous exudate

Schematic

Slide 29 · Fibrinous patterns are the most frequent

Fibrinous and serofibrinous pericarditis dominate the text’s classification.

Serous fluid is variably mixed with a fibrinous exudate.

Inflammatory surfaces produce recognizable symptoms and signs.

Heart

Slide 30 · Common causes of fibrinous pericarditis

Acute myocardial infarction and postinfarction Dressler syndrome.

Uremia, rheumatic fever, and systemic lupus erythematosus.

Trauma and routine cardiac surgery; Radiation is another cause.

Myocardial

MI / Dressler

Systemic

Uremia / SLE

Iatrogenic

Surgery / radiation

Schematic

Slide 31 · Infarction-related mechanisms are distinct

Acute MI is a cause of fibrinous pericarditis.

Dressler syndrome is a postinfarction autoimmune reaction.

The text places Dressler syndrome weeks after infarction.

Acute MI

Associated acute event

Fibrinous reaction

Dressler syndrome

Autoimmune reaction

Weeks after MI

Editable comparison

Slide 32 · Serofibrinous exudate has two components

Serous liquid separates or distends the pericardial layers.

Fibrin is deposited on inflamed serosal surfaces.

The relative proportions vary across cases.

Heart

Serous liquid + fibrin deposit

Slide 33 · Pain has a characteristic inflammatory pattern

Pain is often sharp and pleuritic.

Its severity may vary with position.

Fever and sometimes congestive failure accompany the process.

Sharp

Pain character

Pleuritic

Respiratory relation

Positional

Varies with posture

Schematic

Slide 34 · A friction rub reflects opposing inflamed surfaces

Inflamed surfaces can rub with cardiac movement.

A loud pericardial friction rub may be the clearest clinical sign.

This finding is most likely when the surfaces remain apposed.

Inflamed surfaces

Surface-to-surface friction

Friction rub

Schematic

Slide 35 · Fluid may silence an otherwise audible rub

Additional effusion separates the opposing serosal layers.

Mechanical contact decreases as separation increases.

An absent rub therefore does not exclude pericarditis.

Surface contact

Rub may be heard

Less free fluid

Layer separation

Rub may disappear

More free fluid

Editable comparison

Slide 36 · Radiation may affect several disease stages

Thoracic irradiation may cause acute pericarditis.

It can also cause an effusion.

Chronic pericardial damage and fibrosis may emerge later.

Thoracic irradiation

Inflammation / effusion

Possible chronic fibrosis

Schematic

Slide 37 · Purulent pericarditis requires microbial invasion

Suppuration denotes active infection of the pericardial space.

Infection may arrive by direct, blood-borne, lymphatic, or procedural routes.

The process carries a strong propensity to organize into scar.

Heart

Purulent exudate

Slide 38 · Contiguous spread is one route to suppuration

Empyema or lobar pneumonia may extend toward the sac.

Mediastinal infection is another source.

A ring abscess can extend through myocardium or aortic root.

Pneumonia / empyema

Direct extension

Purulent pericarditis

Schematic

Slide 39 · Other routes introduce organisms

Hematogenous seeding from the bloodstream.

Lymphatic extension from another site.

Direct introduction during cardiotomy.

Blood

Seeding

Lymphatics

Extension

Procedure

Cardiotomy

Schematic

Slide 40 · Purulent exudate ranges from cloudy fluid to pus

The text describes cloudy liquid through thick purulent material.

Reported volume may reach 500 mL.

Serosal surfaces become reddened, granular, and exudate-coated.

Heart

Purulent exudate

Slide 41 · Histologic inflammation may extend beyond the sac

An acute inflammatory reaction characterizes suppurative pericarditis.

Contiguous extension can involve surrounding mediastinal structures.

This wider process is termed mediastinopericarditis.

Acute infection

Pericardial reaction

Mediastinal spread

Schematic

Slide 42 · Suppurative disease causes prominent systemic illness

The local pain and rub may resemble fibrinous pericarditis.

Spiking fevers and rigors point toward active infection.

Systemic toxicity often exceeds that of nonpurulent inflammation.

Fibrinous

Sharp pleuritic pain

Rub ± fever

Purulent

Local signs possible

Spiking fevers, rigors

Editable comparison

Slide 43 · Purulent pericarditis commonly heals by scarring

Complete resolution is described as infrequent.

Organizing inflammation produces fibrous adhesions and contracture.

This explains the association with later constrictive pericarditis.

Suppuration

Organization / scar

Possible constriction

Schematic

Slide 44 · Tuberculosis may produce caseating foci

Tuberculous pericarditis is included among infectious causes.

Caseation may be present in the affected pericardium.

Tuberculosis may follow a chronic rather than exclusively acute course.

Tuberculosis

Chronic course possible

Pericardium

Caseating foci may occur

Schematic

Slide 45 · Hemorrhagic pericarditis contains mixed exudate

Blood is admixed with fibrinous or suppurative material.

This differs from hemopericardium described simply as blood in the sac.

A hemorrhagic exudate should trigger etiologic investigation.

Hemopericardium

Blood in sac

May be rapidly fatal

Hemorrhagic pericarditis

Blood + exudate

Inflammatory process

Editable comparison

Slide 46 · Malignancy is a leading cause of hemorrhagic pericarditis

Neoplastic spread into the pericardial space is a common context.

Malignant cells may be found in the effusion.

Underlying tumor biology determines the wider prognosis.

Neoplastic spread

Hemorrhagic exudate

Possible tumor cells

Schematic

Slide 47 · Fluid cytology can reveal metastatic neoplasia

Sampling fluid by pericardial tap can disclose neoplastic cells.

Positive cytology provides etiologic evidence of malignant involvement.

Interpret findings in the clinical setting of a suspected tumor.

Sample

Pericardial tap

Assess

Neoplastic cells

Meaning

Evidence of involvement

Schematic

Slide 48 · Hemorrhagic inflammation has additional causes

Bacterial infection and tuberculosis are listed causes.

An underlying bleeding diathesis can contribute.

Hemorrhagic pericarditis may occur after cardiac surgery.

Infection

Bacteria / TB

Host factor

Bleeding diathesis

Procedure

Cardiac surgery

Schematic

Slide 49 · Postoperative bleeding may cause tamponade

Surgical hemorrhage can accumulate within the pericardial sac.

Substantial blood loss or compression may necessitate reoperation.

This is a clinically urgent complication rather than a benign expected effusion.

Postoperative bleeding

Pericardial accumulation

Tamponade / reoperation

Schematic

Slide 50 · Malignant hemorrhagic disease: Prognosis varies

Pericardial spread of cancer generally indicates a poor prognosis.

This is not absolute for every malignant neoplasm.

Highly treatable cancers, including some non-Hodgkin lymphomas, are noted exceptions.

General pattern

Poor prognosis with spread

Important exception

Treatable lymphoma possible

Schematic

Slide 51 · Organization connects acute to chronic disease

Acute exudates may resolve or undergo organization.

Healing can leave fibrous thickening or adhesions.

The clinical effect depends on scar location, extent, and constraint.

Inflammation

Fibrous organization

Plaques / adhesion / shell

Schematic

Slide 52 · A soldiers’ plaque may be incidental

Plaque-like fibrous thickening can remain on a serosal surface.

It is an organized outcome of prior inflammation.

Such localized plaques rarely impair cardiac function.

Heart

Slide 53 · Delicate adhesions usually cause little dysfunction

Thin, string-like attachments may persist after inflammation.

Limited adhesions seldom alter hemodynamics.

Scar presence alone does not establish constrictive physiology.

Heart

Slide 54 · Adhesive pericarditis can obliterate the space

Mesh-like fibrous adhesions bridge the two surfaces.

The potential pericardial space may be largely lost.

The text notes preserved cardiac function in most such cases.

Heart

Slide 55 · Adhesive mediastinopericarditis fixes the sac externally

It may follow infection, cardiac surgery, or mediastinal irradiation.

Pericardium becomes adherent to neighboring structures.

The external tethering places added load on cardiac contraction.

Infection / surgery / radiation

External adherence

Systolic mechanical load

Schematic

Slide 56 · External tethering changes systolic mechanics

The contracting heart pulls on attached parietal pericardium.

The rib cage and diaphragm can be retracted with systole.

Pulsus paradoxus may be observed; Workload can cause dilation or hypertrophy.

Heart movement

Pulls attached structures

Possible effect

Hypertrophy / dilation

Schematic

Slide 57 · Constrictive pericarditis forms a rigid shell

A dense fibrous or fibrocalcific scar encloses the heart.

The pericardial space may be obliterated.

An extreme rigid casing resembles a plaster mold: Concretio cordis.

Heart

Dense fibrous / fibrocalcific shell

Slide 58 · The constricting scar can be markedly thick

The text describes scar thickness up to 1 cm.

Calcification may accompany dense fibrosis.

An encasing wall limits the heart’s capacity to enlarge.

Heart

Dense fibrous / fibrocalcific shell

Slide 59 · Constrictive disease limits diastolic expansion

A noncompliant shell restricts cardiac filling.

The resulting decrease in output can mimic restrictive cardiomyopathy.

The primary constraint is pericardial rather than intramyocardial.

Rigid outer shell

Restricted diastolic expansion

Reduced output

Schematic

Slide 60 · Cardiac reserve is especially impaired

Output may already be decreased at rest.

The heart cannot substantially increase output with systemic demand.

In contrast to external tethering, dense constriction prevents hypertrophy and dilation.

At rest

Output may be low

On exertion

Limited ability to augment output

Schematic

Slide 61 · Clinical signs reflect restricted cardiac filling

Elevated jugular venous pressure suggests impaired venous return.

Peripheral edema reflects congestive physiology.

Heart sounds may be distant or muffled.

Venous

Raised JVP

Peripheral

Edema

Auscultation

Muffled sounds

Schematic

Slide 62 · Constrictive and restrictive disease can resemble

Both impair cardiac filling and output.

Constrictive disease involves an encasing pericardial scar.

Restrictive cardiomyopathy involves altered myocardial compliance.

Constrictive

Encasing pericardial scar

Extrinsic limitation

Restrictive

Noncompliant myocardium

Intrinsic limitation

Editable comparison

Slide 63 · Pericardiectomy addresses the mechanical cause

Resection removes the constricting fibrous shell.

The intended effect is relief of extrinsic diastolic restriction.

Pericardiectomy as treatment for constrictive pericarditis.

Fibrous shell

Shell resection

Relief of external constraint

Schematic

Slide 64 · Pericardial pathology: Integrated sequence

Inflammation may produce a serous, fibrinous, purulent, or hemorrhagic response.

Some episodes resolve; Others organize into scar or adhesions.

A dense encasing scar culminates in constrictive physiology.

Inflammatory injury

Organization into scar

Possible constriction

Schematic

Slide 65 · Different morphologies imply different threats

Rapid blood accumulation: Acute filling compromise.

Suppuration: Infection and subsequent fibrosis.

Constrictive scar: Persistent restriction of diastolic expansion.

Hemorrhage

Acute tamponade

Suppuration

Infection → fibrosis

Constriction

Chronic filling restriction

Editable comparison

Slide 66 · Case: Rapid hemodynamic deterioration

A patient develops abrupt cardiac deterioration after myocardial rupture.

A newly formed blood collection occupies the pericardial sac.

Question: Which mechanism immediately threatens survival?

Heart

Hemorrhagic content

Slide 67 · Case interpretation: Acute tamponade

Rapid hemopericardium leaves little time for sac remodeling.

Compression primarily impairs filling of susceptible chambers.

The rate of accumulation is essential to understanding severity.

Rapid fluid gain

Cardiac compression

Impaired filling

Schematic

Slide 68 · Case: Fever and an exudate-coated sac

Lobar pneumonia is followed by spiking fever and rigors.

The pericardial surfaces are red, granular, and coated with pus.

Question: What is the route and likely healing consequence?

Heart

Purulent exudate

Slide 69 · Case interpretation: Purulent extension

Infection can spread directly from neighboring pneumonia.

Acute suppurative inflammation tends to organize into scar.

Constriction is therefore an important possible late consequence.

Suppuration

Organization / scar

Possible constriction

Schematic

Slide 70 · Case: Elevated JVP and a rigid casing

A patient has peripheral edema and muffled heart sounds.

The heart is enclosed in a dense calcified pericardial scar.

Question: Why is the ability to augment output reduced?

Heart

Dense fibrous / fibrocalcific shell

Slide 71 · Case interpretation: Mechanical constriction

The rigid pericardial shell limits diastolic expansion.

The heart has very little capacity to increase output with demand.

Removal of the constricting shell is the source-described treatment.

Rigid outer shell

Restricted diastolic expansion

Reduced output

Schematic

Slide 72 · Core distinctions to retain

Effusion severity depends strongly on how quickly fluid accumulates.

Acute exudate composition links morphology to etiology.

The difference between incidental adhesion and constriction is functional.

Pericardial disease can cause either an acute emergency or chronic limitation.

Slide 73 · Primary reference and scope

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

Chapter 12, The Heart: pericardial disease and adjacent subheadings (printed pp. 525–526).

Conceptual figures are original, editable schematics—not actual gross or microscopic specimens.