Pericardial Disease: Pericarditis, Tamponade, and Constrictive Pericarditis

Pericardial disease encompasses a spectrum of conditions affecting the pericardium, the double-layered fibrous sac surrounding the heart. The pericardium consists of an outer fibrous pericardium and inner serous pericardium (visceral and parietal layers) with 15-50 mL of pericardial fluid in between.

[KEY_CONCEPT] The three major pericardial diseases form a clinical continuum:

• Acute pericarditis: Inflammation of the pericardial layers • Cardiac tamponade: Hemodynamic compromise from pericardial fluid accumulation • Constrictive pericarditis: Fibrotic thickening and calcification restricting cardiac filling

Pathophysiology varies by condition:

Acute Pericarditis:

• Inflammatory response leads to pericardial irritation and friction
• Most commonly idiopathic (85-90%) or viral in developed countries
• Other causes: bacterial, tuberculous, autoimmune, malignant, post-MI, uremic

Cardiac Tamponade:

• Rapid accumulation of pericardial fluid exceeds pericardial compliance
• Ventricular interdependence develops - filling of one ventricle impairs the other
• Critical threshold typically 200-300 mL with acute accumulation

[CLINICAL_PEARL] The rate of fluid accumulation is more important than absolute volume - chronic effusions can accommodate >1L without hemodynamic compromise.

Constrictive Pericarditis:

• Chronic inflammation leads to pericardial fibrosis, thickening, and calcification
• Rigid pericardial shell prevents normal cardiac filling
• Equalization of pressures occurs across all cardiac chambers
• Common causes: prior cardiac surgery, radiation, tuberculosis, connective tissue disease

[HIGH_YIELD] All three conditions can present with elevated jugular venous pressure, but the underlying mechanisms differ fundamentally.

Clinical presentations vary significantly among pericardial diseases:

Acute Pericarditis

Classic triad (present in ~85%): • Chest pain: Sharp, pleuritic, worse when supine, improved by sitting forward • Pericardial friction rub: Triphasic scratchy sound (atrial systole, ventricular systole, ventricular diastole) • ECG changes: Diffuse ST elevations with PR depressions

[HIGH_YIELD] Pericarditic chest pain characteristically improves with sitting forward and worsens with lying flat - opposite of typical angina.

Associated symptoms:

• Fever, malaise, dyspnea
• Dry cough
• Hiccups (phrenic nerve irritation)

Cardiac Tamponade

Beck's triad (classic but present in <50%): • Elevated JVP • Hypotension • Muffled heart sounds

More reliable findings:

• Pulsus paradoxus >20 mmHg (present in 95%)
• Tachycardia and tachypnea
• Kussmaul's sign (JVP rise with inspiration)

[CLINICAL_PEARL] Tamponade is a clinical diagnosis - don't wait for echocardiogram if hemodynamically unstable.

Constrictive Pericarditis

Right heart failure predominance:

• Elevated JVP with prominent y-descent (Friedrich's sign)
• Kussmaul's sign (paradoxical JVP rise with inspiration)
• Peripheral edema, ascites, hepatomegaly
• Pericardial knock - early S3 occurring before normal S3 timing

Acute Pericarditis Diagnostic Criteria

[HIGH_YIELD] Diagnosis requires ≥2 of the following 4 criteria:

✓ Characteristic chest pain (sharp, pleuritic, positional) ✓ Pericardial friction rub ✓ Suggestive ECG changes (diffuse ST elevation, PR depression) ✓ New or worsening pericardial effusion

Diagnostic Workup Algorithm:

Suspected Pericardial Disease ↓ Initial Assessment: ECG, Echo, CXR, Labs ↓ Acute Pericarditis? → Yes → Assess for effusion/tamponade ↓ No ↓ Tamponade signs? → Yes → URGENT Echo → Pericardiocentesis ↓ No Chronic symptoms? ↓ Yes Advanced imaging (CT/MRI) + Hemodynamics ↓ Constrictive vs Restrictive Assessment

Key Diagnostic Studies

Electrocardiogram:

• Stage 1: Diffuse ST elevation (concave up), PR depression
• Stage 2: ST normalization, T-wave flattening
• Stage 3: T-wave inversion
• Stage 4: Normalization

[CLINICAL_PEARL] Unlike STEMI, pericarditis shows diffuse ST elevation without reciprocal changes and maintains normal R-wave progression.

Echocardiography:

• Tamponade signs: Right heart collapse, ventricular interdependence, >25% mitral inflow variation
• Constrictive signs: Septal bounce, hepatic vein reversal, mitral inflow variation <25%

Advanced Imaging:

• CT: Pericardial thickening >4mm, calcification
• MRI: Tissue characterization, inflammation assessment
• Cardiac catheterization: Hemodynamic assessment for constrictive physiology

Constrictive vs Restrictive Differentiation

Laboratory Studies:

• Inflammatory markers: ESR, CRP, CBC
• Cardiac enzymes: May be mildly elevated in pericarditis
• Additional tests: ANA, RF, tuberculin skin test, thyroid function based on clinical suspicion

Acute Pericarditis Management

First-line therapy combines:

NSAIDs + Colchicine:

• Ibuprofen 600-800mg TID OR Indomethacin 25-50mg TID
• Colchicine 0.5mg BID (0.5mg daily if <70kg or intolerant)
• Duration: 1-2 weeks for uncomplicated cases

[HIGH_YIELD] Colchicine reduces recurrence risk by 50% and should be used in all patients without contraindications.

Treatment Algorithm:

Acute Pericarditis Diagnosis ↓ High-risk features? → Yes → Hospitalize • Fever >38°C • IV antibiotics if bacterial • Large effusion • Consider steroids • Tamponade risk • Trauma/anticoagulation ↓ No Outpatient Management • NSAIDs + Colchicine • Activity restriction • Follow-up in 1 week ↓ Symptoms resolved? → No → Consider recurrent pericarditis ↓ Yes Taper medications over 2-4 weeks

Recurrent Pericarditis:

• Occurs in 15-30% of patients
• Treatment: Higher-dose colchicine (up to 2mg/day) + NSAIDs
• Refractory cases: Low-dose corticosteroids, immunosuppressants, pericardial window

Cardiac Tamponade Management

[CLINICAL_PEARL] Tamponade is a medical emergency requiring immediate intervention.

Immediate Management:

1. IV fluid resuscitation (maintain preload)
2. Avoid positive pressure ventilation (reduces venous return)
3. Urgent pericardiocentesis - therapeutic and diagnostic
4. Avoid vasodilators and diuretics

Pericardiocentesis Technique:

• Subxiphoid approach most common
• Echo-guided preferred when available
• Remove fluid slowly to avoid right heart overdistension
• Drain placement for continued drainage

Constrictive Pericarditis Management

Medical Management (limited efficacy):

• Diuretics: Cautious use to reduce preload
• Avoid vasodilators: Can worsen hypotension
• Treat underlying causes: Anti-inflammatory for early/inflammatory phase

Surgical Management:

• Pericardiectomy: Definitive treatment for symptomatic patients
• Complete pericardiectomy preferred over partial
• High operative risk: 5-15% mortality, best outcomes at experienced centers

[HIGH_YIELD] Early referral for pericardiectomy is crucial - symptoms and outcomes worsen with delayed intervention.

Special Considerations:

• Post-surgical constrictive pericarditis: May resolve spontaneously within 2-3 months
• Radiation-induced: Often progressive and requires surgery
• Tuberculous: Anti-TB therapy may prevent progression if caught early

Acute Pericarditis Complications

Early Complications:

• Pericardial effusion: Develops in 60% of cases
• Cardiac tamponade: Rare (<2%) but life-threatening
• Myocarditis: Concurrent inflammation in 10-15% ("myopericarditis")

Late Complications:

• Recurrent pericarditis: 15-30% of patients
• Chronic pericarditis: Symptoms >3 months
• Constrictive pericarditis: Rare complication (<1%)

[CLINICAL_PEARL] Myopericarditis should be suspected when troponins are significantly elevated (>5x upper limit of normal) with regional wall motion abnormalities.

Tamponade Complications

Immediate complications:

• Cardiovascular collapse: Can occur rapidly
• Multi-organ failure: From prolonged low cardiac output
• Procedural complications: Bleeding, pneumothorax, cardiac perforation (1-3%)

Post-intervention:

• Recurrent tamponade: 10-20% risk
• Infection: Risk with prolonged catheter drainage
• Constrictive pericarditis: Late complication in some cases

Constrictive Pericarditis Prognosis

Natural History:

• Progressive disease: Symptoms typically worsen over time
• Functional decline: NYHA Class III-IV symptoms common
• Poor medical prognosis: 5-year survival ~50% without surgery

Surgical Outcomes:

Post-pericardiectomy:

• Operative mortality: 5-15% at experienced centers
• Functional improvement: 80-90% of survivors
• Complete resolution: May take 3-6 months
• Residual symptoms: 10-20% have persistent limitations

[HIGH_YIELD] Radiation-induced constrictive pericarditis has the worst prognosis due to associated myocardial fibrosis and coronary disease.

Long-term Monitoring

Acute Pericarditis:

• Routine follow-up: 1 week, then 1 month
• Echo surveillance: Not needed for uncomplicated cases
• Recurrence monitoring: Symptoms, inflammatory markers

Post-tamponade:

• Serial echocardiograms: Weekly initially, then monthly
• Hemodynamic monitoring: Especially first 24-48 hours
• Long-term surveillance: Annual echo to assess for constriction

Post-pericardiectomy:

• Intensive monitoring: First 48-72 hours for hemodynamic instability
• Gradual improvement: Functional capacity over 3-6 months
• Annual assessment: Echo, functional status, symptoms

Prevention Strategies

Primary Prevention:

• Appropriate anticoagulation management: Avoid unnecessary anticoagulation
• Infection control: Prompt treatment of bacterial/viral infections
• Post-cardiac surgery: Early recognition and treatment

Secondary Prevention:

• Colchicine therapy: Reduces recurrent pericarditis risk
• Gradual medication taper: Avoid abrupt discontinuation
• Activity modification: Avoid strenuous exercise during acute phase