Pericarditis and Cardiac Tamponade

Quick Answer

Acute pericarditis is inflammation of the pericardium characterized by chest pain (pleuritic, positional), pericardial friction rub, and ECG changes (widespread ST elevation, PR depression). Cardiac tamponade is a life-threatening complication where pericardial fluid accumulation causes hemodynamic compromise via impaired ventricular filling. Diagnosis requires clinical features (Beck triad: hypotension, elevated JVP, muffled heart sounds), pulsus paradoxus greater than 10 mmHg, and echocardiography (circumferential effusion, RA/RV diastolic collapse, respiratory variation greater than 25%). Immediate pericardiocentesis is life-saving in tamponade, while uncomplicated pericarditis is managed with NSAIDs and colchicine (COPE/ICAP trials, PMID: 23591265).

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CICM Exam Focus

Second Part Written Exam

SAQ themes:

• Diagnosis of acute pericarditis vs myocardial infarction (ECG interpretation)
• Management of cardiac tamponade in ICU
• Pericardiocentesis technique and complications
• Post-cardiac surgery tamponade recognition
• Constrictive vs restrictive physiology

Viva themes:

• Approach to hemodynamically unstable patient with pericardial effusion
• Interpretation of echocardiographic findings
• Management of purulent vs uremic pericarditis
• Ventilatory strategies in tamponade (avoiding positive pressure)
• Post-pericardiocentesis monitoring

Clinical Integration

Critical care context:

• Tamponade as cause of undifferentiated shock
• Post-cardiac surgery complications
• Uremic pericarditis in renal failure patients
• Malignant effusions in oncology patients
• Trauma-related hemopericardium

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Key Points

1. Acute pericarditis diagnosis requires ≥2 of 4 criteria: chest pain, friction rub, ECG changes, pericardial effusion (ESC 2015 Guidelines, PMID: 26320112)
2. Cardiac tamponade develops when pericardial pressure exceeds cardiac filling pressures, impairing venous return and stroke volume
3. Beck triad (hypotension, JVP elevation, muffled heart sounds) has 40-60% sensitivity but is relatively specific for tamponade
4. Pulsus paradoxus greater than 10 mmHg (exaggerated drop in systolic BP during inspiration) is 75-80% sensitive for tamponade (PMID: 17241859)
5. Echocardiography is gold standard: circumferential effusion, RA collapse (greater than 1/3 cardiac cycle), RV diastolic collapse, respiratory IVC plethora, mitral/tricuspid inflow variation greater than 25%
6. Pericardiocentesis via subxiphoid approach is first-line for tamponade, with 90-95% success rate and 3-5% major complication rate (PMID: 21172822)
7. Avoid positive pressure ventilation in tamponade when possible—increases intrathoracic pressure, decreases preload, worsens cardiac output
8. Colchicine 0.5 mg daily reduces recurrence from 32.3% to 16.7% (NNT=6) in acute pericarditis (COPE trial, PMID: 23591265)
9. Purulent pericarditis mortality 30-40% despite drainage; requires prolonged antibiotics and often surgical pericardiectomy (PMID: 21764193)
10. Post-MI pericarditis (Dressler syndrome) occurs 1-12 weeks post-infarction; avoid NSAIDs in first 14 days post-MI due to infarct expansion risk (PMID: 28886620)

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Clinical Overview

Definition and Pathophysiology

Acute pericarditis is inflammation of the pericardium, presenting with chest pain, pericardial friction rub, characteristic ECG changes, and often pericardial effusion. The parietal and visceral pericardial layers normally contain 15-50 mL of fluid; inflammation increases fluid production and causes fibrinous exudate deposition.

Cardiac tamponade occurs when pericardial fluid accumulation increases intrapericardial pressure above right atrial and right ventricular diastolic pressures, impairing ventricular filling. The rate of fluid accumulation is critical—rapid accumulation (e.g., trauma, aortic dissection) can cause tamponade with as little as 150-200 mL, while chronic effusions may accommodate greater than 1,000 mL before hemodynamic compromise.

Pericardial pressure-volume relationship:

• Pericardium is relatively non-compliant
• Small volume increases → minimal pressure rise (flat portion of curve)
• Critical volume threshold → steep pressure rise (steep portion)
• Tamponade occurs when intrapericardial pressure exceeds atrial pressures

Hemodynamic consequences of tamponade:

1. Impaired ventricular filling: Elevated pericardial pressure limits diastolic expansion
2. Reduced stroke volume: Decreased preload → decreased cardiac output (Frank-Starling mechanism)
3. Compensatory tachycardia: Attempts to maintain cardiac output (CO = HR × SV)
4. Increased systemic vascular resistance: Compensatory vasoconstriction maintains blood pressure initially
5. Ventricular interdependence: Increased septal shift with respiration
6. Pulsus paradoxus: Exaggerated inspiratory decrease in systolic BP (greater than 10 mmHg)

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Epidemiology

Incidence

• Acute pericarditis: 27 cases per 100,000 population per year (PMID: 18519551)
• Recurrent pericarditis: 15-30% after first episode without colchicine, 50% after multiple recurrences (PMID: 26320112)
• Hospital presentations: Pericarditis accounts for 0.1-0.2% of emergency department visits, 5% of non-ischemic chest pain admissions
• ICU incidence: Post-cardiac surgery tamponade 0.8-6%, trauma-related hemopericardium 2-3% of penetrating thoracic trauma

Demographics

• Age: Pericarditis most common in adults 20-50 years; post-MI and uremic pericarditis more common in older adults
• Sex: Male predominance (1.5-2:1) for idiopathic/viral pericarditis
• Geographic variation: Tuberculous pericarditis common in Sub-Saharan Africa (50-70% of cases), HIV-endemic regions

Etiology

Infectious (40-60% in developing countries):

• Viral (most common in high-income countries): Coxsackievirus B, echovirus, adenovirus, EBV, CMV, HIV (PMID: 26320112)
• Bacterial: Staphylococcus aureus, Streptococcus pneumoniae, Mycobacterium tuberculosis (PMID: 21764193)
• Fungal: Histoplasma, Candida (immunocompromised)

Non-infectious:

• Post-myocardial infarction: Early (1-4 days, fibrinous pericarditis) vs Dressler syndrome (1-12 weeks, immune-mediated) (PMID: 28886620)
• Uremia: 6-10% of dialysis patients, related to inadequate dialysis (PMID: 19628668)
• Malignancy: Lung cancer (37%), breast cancer (22%), lymphoma (12%), melanoma (PMID: 22828740)
• Autoimmune: SLE (25% develop pericarditis), rheumatoid arthritis, scleroderma
• Post-cardiac surgery: Early (below 7 days, hemorrhagic) vs late (greater than 10 days, post-pericardiotomy syndrome)
• Radiation: Occurs 5-10 years after thoracic radiotherapy, often constrictive
• Drugs: Hydralazine, procainamide, isoniazid, phenytoin (lupus-like syndrome)
• Trauma: Penetrating (hemopericardium), blunt (delayed effusion)
• Idiopathic: 80-90% of acute pericarditis in high-income countries (presumed viral)

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Pathophysiology

Mechanisms of Pericardial Inflammation

Viral pericarditis:

• Direct viral invasion of pericardial tissue
• Inflammatory cytokine release (IL-1β, IL-6, TNF-α)
• T-cell mediated immune response
• Persistence may lead to recurrent pericarditis

Bacterial pericarditis:

• Direct infection via hematogenous spread, contiguous spread (pneumonia, endocarditis), or penetrating trauma
• Purulent exudate formation
• High risk of constrictive pericarditis (20-30%) if untreated

Autoimmune pericarditis:

• Antibody deposition and complement activation
• Immune complex formation
• Autoreactive T-cell infiltration
• Recurrent inflammation characteristic

Hemodynamics of Cardiac Tamponade

Normal pericardial physiology:

• Pericardial pressure: -5 to +5 mmHg
• Pericardial fluid: 15-50 mL (ultrafiltrate of plasma)
• Functions: Reduces friction, limits acute cardiac dilatation, anatomic barrier

Tamponade physiology:

1. Equalization of pressures:

   • Pericardial pressure rises to equal right atrial, right ventricular diastolic, pulmonary artery diastolic, and pulmonary capillary wedge pressures
   • Classic finding: All diastolic pressures within 5 mmHg

2. Reduced venous return:

   • Elevated right atrial pressure impairs systemic venous drainage
   • Jugular venous distension, hepatomegaly, peripheral edema

3. Pulsus paradoxus mechanism:

   • Inspiration: Increased venous return to right heart → interventricular septum shifts leftward → reduced LV filling → decreased LV stroke volume and systolic BP
   • Expiration: Decreased RV filling → septum returns → LV filling improves
   • Exaggerated in tamponade (greater than 10 mmHg drop, normal below 8 mmHg)

4. Compensatory mechanisms:

   • Tachycardia (maintain CO = HR × SV)
   • Increased SVR (vasoconstriction)
   • Catecholamine release
   • Eventually fail → cardiovascular collapse

Low-pressure vs high-pressure tamponade:

• Low-pressure (hypovolemic patients): Equalization at below 10 mmHg, may lack classic JVP elevation
• High-pressure: Equalization at greater than 15 mmHg, marked JVP elevation

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Clinical Presentation

Acute Pericarditis

Symptoms:

1. Chest pain (85-90%):

   • Pleuritic (sharp, worse with inspiration, cough)
   • Positional (worse supine, relieved sitting forward)
   • Retrosternal or precordial, radiates to trapezius ridge (pathognomonic)
   • Sudden onset, may be severe
   • Lasts hours to days

2. Other symptoms:

   • Dyspnea (20-30%, especially with large effusion)
   • Fever (mild, below 39°C in viral pericarditis)
   • Fatigue, malaise
   • Cough (irritation from pericardial inflammation)

Signs:

1. Pericardial friction rub (30-50%):

   • Scratchy, high-pitched, superficial sound
   • Three components (atrial systole, ventricular systole, ventricular diastole)
   • Best heard at left lower sternal border, patient leaning forward
   • May be transient (present hours, absent later)
   • Pathognomonic when present

2. Other findings:

   • Tachycardia
   • Fever
   • No signs of tamponade in uncomplicated pericarditis

Cardiac Tamponade

Beck Triad (1935):

1. Hypotension (SBP below 90 mmHg or greater than 30 mmHg drop from baseline)
2. Elevated jugular venous pressure (JVP greater than 8 cm H₂O)
3. Muffled/distant heart sounds

• Sensitivity: 40-60% (often incomplete, especially early)
• Specificity: High when complete triad present
• Limitations: Difficult to assess in noisy ICU, obese patients, mechanically ventilated

Classic clinical findings:

1. Hypotension:

   • Systolic BP typically 80-100 mmHg (unless chronic effusion with compensation)
   • Narrow pulse pressure (below 25 mmHg)
   • Progressive with ongoing fluid accumulation

2. Elevated JVP:

   • Prominent y-descent (atrial filling during ventricular systole unimpeded)
   • Blunted x-descent (impaired atrial relaxation)
   • Kussmaul sign absent (unlike constrictive pericarditis)

3. Pulsus paradoxus (75-80% sensitivity):

   • greater than 10 mmHg drop in systolic BP during normal inspiration
   • Measured: Inflate BP cuff above systolic, slowly deflate, note BP when Korotkoff sounds first heard (expiration only), then BP when heard throughout cycle (inspiration + expiration), difference greater than 10 mmHg diagnostic
   • False negatives: Aortic regurgitation, ASD, regional tamponade, positive pressure ventilation, severe hypotension
   • False positives: COPD, severe asthma, obesity, pulmonary embolism

4. Tachycardia:

   • HR typically 100-120 bpm
   • Compensatory to maintain cardiac output
   • Absence may indicate severe decompensation or beta-blockade

5. Dyspnea and tachypnea:

   • Respiratory rate 20-30/min
   • Anxiety, restlessness (low cardiac output)

6. Other signs:

   • Cool extremities (poor perfusion)
   • Oliguria (below 0.5 mL/kg/hr)
   • Altered mental status (severe cases)
   • Peripheral edema, hepatomegaly (subacute/chronic)

Special Presentations

Post-cardiac surgery tamponade:

• Often loculated (posterior, localized)
• May compress specific chambers (RA, LA)
• Classic signs may be absent (pulsus paradoxus in only 20-30%)
• High index of suspicion needed: Unexplained hypotension, elevated CVP, decreased chest tube drainage

Uremic pericarditis:

• 6-10% of dialysis patients
• Often asymptomatic or mild chest pain
• Hemorrhagic effusions common (anticoagulation during dialysis)
• Risk of tamponade 10-20%

Malignant pericardial effusion:

• Subacute/chronic presentation
• Large volumes (greater than 500 mL) tolerated before tamponade
• May have other signs of malignancy (weight loss, lymphadenopathy)

Purulent pericarditis:

• Septic shock presentation
• High fever (greater than 39°C), rigors
• Mortality 30-40% despite treatment

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Investigations

Electrocardiography (ECG)

Acute pericarditis ECG findings (60-80%):

Stage 1 (hours to days):

• Widespread ST elevation: Concave upward ("saddleback"), in all leads except aVR and V1
• PR depression: Diffuse (except aVR where PR elevation occurs)
• Preserved R wave amplitude (unlike STEMI)

Stage 2 (days):

• Normalization of ST and PR segments
• T waves flatten

Stage 3 (weeks):

• T wave inversion (diffuse)

Stage 4 (weeks to months):

• Normalization or persistent T wave changes

Differentiating pericarditis vs STEMI:

Tamponade ECG findings:

• Electrical alternans: Beat-to-beat variation in QRS amplitude (P wave, QRS, T wave)
  • "Mechanism: Heart swinging in pericardial fluid"
  • Sensitivity 20-30%, Specificity greater than 90%
• Low voltage QRS: below 5 mm in limb leads, below 10 mm in precordial leads (40-50% of cases)
• Sinus tachycardia: Most common rhythm

Chest X-Ray

Pericardial effusion (greater than 250 mL):

• "Water bottle" or "flask-shaped" cardiac silhouette
• Increased cardiothoracic ratio (greater than 0.5)
• Loss of normal cardiac contours
• Clear lung fields (unless concomitant pathology)

Limitations:

• Insensitive for effusions below 250 mL
• Cannot distinguish pericardial effusion from cardiomegaly
• Not diagnostic of tamponade (hemodynamic diagnosis)

Other findings:

• Widened mediastinum (aortic dissection with hemopericardium)
• Pneumonia, malignancy (underlying cause)

Echocardiography

Gold standard for pericardial effusion and tamponade diagnosis.

Pericardial effusion size:

• Small: Echo-free space below 10 mm in diastole
• Moderate: 10-20 mm
• Large: greater than 20 mm
• Massive: greater than 20 mm with compression of cardiac chambers

Distribution:

• Circumferential vs loculated (posterior, anterior, lateral)
• Post-surgical: Often loculated, may selectively compress chambers

Tamponade echocardiographic findings:

1. Right atrial collapse (most sensitive):

   • Free wall invagination during ventricular systole (greater than 1/3 of cardiac cycle)
   • Sensitivity 85-90%, Specificity 60-70%
   • May be absent in pulmonary hypertension, RV hypertrophy

2. Right ventricular diastolic collapse:

   • Most specific sign (Specificity 80-90%)
   • Early diastolic invagination of RV free wall
   • Duration greater than 1/3 diastole highly specific

3. Respiratory variation in mitral/tricuspid inflow (Doppler):

   • Mitral inflow: greater than 25% decrease in E-wave velocity with inspiration (normal below 15%)
   • Tricuspid inflow: greater than 40% increase in E-wave velocity with inspiration (normal below 25%)
   • Reflects ventricular interdependence

4. Inferior vena cava (IVC) plethora:

   • IVC diameter greater than 2 cm with below 50% respiratory collapse
   • Elevated right atrial pressure

5. Ventricular interdependence:

   • Septal shift toward LV during inspiration
   • "Bouncing" septum

Limitations:

• Regional tamponade (post-surgery) may have focal compression without global signs
• Positive pressure ventilation alters respiratory variation patterns
• RV hypertrophy, pulmonary hypertension may prevent RA/RV collapse
• Loculated effusions may be missed on transthoracic echo (TEE superior)

Cardiac Catheterization

Indications:

• Differentiate constrictive pericarditis from restrictive cardiomyopathy
• Unclear cases when echocardiography non-diagnostic

Tamponade hemodynamic findings:

• Equalization of diastolic pressures: RA, RV diastolic, PA diastolic, PCWP all within 5 mmHg
• Elevated RA pressure: greater than 10-12 mmHg (unless hypovolemic)
• Prominent RA y-descent, blunted x-descent
• Pulsus paradoxus: greater than 10 mmHg decrease in arterial systolic pressure with inspiration
• Low cardiac output: Cardiac index below 2.5 L/min/m²

Laboratory Investigations

Acute pericarditis:

1. Inflammatory markers:

   • CRP: Elevated in 70-80%, useful for monitoring response and detecting recurrence (PMID: 26320112)
   • ESR: Elevated, but less specific than CRP
   • WBC: May be elevated (viral, bacterial causes)

2. Cardiac biomarkers:

   • Troponin: Elevated in 30-50% (myopericarditis)
   • Typically lower than STEMI
   • Indicates myocardial involvement, but not acute coronary syndrome
   • Prognostic: Elevated troponin associated with higher recurrence risk

3. Etiology-specific tests:

   • Viral serology: Often not helpful acutely (retrospective diagnosis)
   • Tuberculosis: TST/IGRA, AFB smear/culture of pericardial fluid
   • Autoimmune: ANA, RF, anti-dsDNA, complement (if clinical suspicion)
   • Uremia: BUN, creatinine, eGFR
   • Malignancy: Cytology of pericardial fluid (sensitivity 80-90% for metastatic disease)

Pericardial fluid analysis (if pericardiocentesis performed):

Other investigations:

• HIV test: If TB pericarditis suspected (30-60% co-infection)
• Blood cultures: If febrile, suspected endocarditis
• CT chest: If malignancy suspected, assess for mass lesions, lymphadenopathy
• Cardiac MRI: Assesses pericardial inflammation, thickness (constrictive pericarditis), myocardial involvement

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Diagnosis

Diagnostic Criteria for Acute Pericarditis

ESC 2015 Guidelines (PMID: 26320112):

Diagnosis requires ≥2 of the following 4 criteria:

1. Pericardial chest pain (pleuritic, positional)
2. Pericardial friction rub
3. New widespread ST elevation or PR depression on ECG
4. Pericardial effusion (new or worsening)

Additional supportive findings:

• Elevated inflammatory markers (CRP, ESR, WBC)
• Evidence of pericardial inflammation on imaging (cardiac MRI)

Diagnostic Approach to Pericardial Effusion/Tamponade

Clinical assessment:

1. History: Chest pain, dyspnea, recent cardiac surgery, trauma, renal failure, malignancy, infection
2. Examination: Beck triad, pulsus paradoxus, pericardial friction rub
3. ECG: ST/PR changes, low voltage, electrical alternans
4. CXR: Enlarged cardiac silhouette (greater than 250 mL effusion)

Urgent echocardiography:

• Confirm effusion, assess size, distribution
• Evaluate for tamponade physiology (RA/RV collapse, respiratory variation, IVC plethora)
• Guide pericardiocentesis (loculate effusions, optimal approach)

Hemodynamic assessment (if unclear):

• Arterial line: Measure pulsus paradoxus objectively
• Central venous pressure: Elevated RA pressure, loss of y-descent
• Invasive monitoring: Equalization of diastolic pressures (if cardiac catheterization performed)

Differential Diagnosis

Acute pericarditis vs STEMI:

• ECG: Diffuse ST elevation (pericarditis) vs territorial (STEMI)
• Troponin: May be elevated in both, but higher in STEMI
• Echocardiography: Regional wall motion abnormality (STEMI), pericardial effusion (pericarditis, though both can coexist)
• Angiography: Coronary occlusion (STEMI)

Cardiac tamponade vs other causes of shock:

Constrictive pericarditis vs restrictive cardiomyopathy:

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Management

Acute Pericarditis Without Tamponade

Goals:

1. Relieve symptoms (chest pain, dyspnea)
2. Reduce inflammation
3. Prevent recurrence
4. Identify and treat underlying cause

First-line therapy: NSAIDs + Colchicine

NSAIDs:

Duration: Continue until symptoms resolve and CRP normalizes, then taper over 2-4 weeks (reduce by 25-50% every 1-2 weeks). Median treatment duration 2-4 weeks.

Colchicine (COPE trial, PMID: 23591265; ICAP trial, PMID: 24694982):

• Dose:
  • greater than 70 kg: 0.5 mg BD for 3 months
    • below 70 kg or intolerance: 0.5 mg OD
• Duration: 3 months for first episode, 6 months for recurrent pericarditis
• Evidence:
  • "COPE trial (2013): Recurrence reduced from 32.3% to 16.7% (NNT = 6) (PMID: 23591265)"
  • "ICAP trial (2013): Recurrence at 18 months: 16.7% (colchicine) vs 37.5% (placebo), P=0.004 (PMID: 24694982)"
• Side effects: Diarrhea (8-10%), nausea, abdominal pain; contraindicated in severe renal/hepatic impairment
• Mechanism: Inhibits microtubule polymerization, reduces neutrophil activation and IL-1β release

Gastric protection:

• Proton pump inhibitor (e.g., omeprazole 20 mg daily) if on NSAIDs, especially if risk factors (age greater than 65, prior GI bleed, concurrent anticoagulation)

Activity restriction:

• Athletes: Avoid competitive sports until symptoms resolve and CRP normalizes (minimum 3 months) (ESC 2015, PMID: 26320112)
• Non-athletes: Restrict strenuous activity until symptom-free

Monitoring:

• Clinical: Symptom resolution
• CRP: Repeat at 1 week, then every 1-2 weeks until normal, guides treatment duration and tapering
• Echocardiography: If moderate-large effusion, repeat at 1 week, then as clinically indicated to assess for tamponade development

Second-line therapy: Corticosteroids

Indications:

• Contraindications to NSAIDs/colchicine (renal failure, GI bleed, allergy)
• Failure of NSAIDs/colchicine after 1-2 weeks
• Specific etiologies: Autoimmune (SLE), uremic pericarditis
• NOT first-line due to higher recurrence rates (40-50% vs 20-30% with NSAIDs/colchicine)

Dosing:

• Prednisone: 0.25-0.5 mg/kg/day (moderate dose, e.g., 25-50 mg daily)
• High-dose (1 mg/kg/day): Reserve for severe, refractory cases
• Duration: 2-4 weeks, then slow taper (reduce 10-25% every 1-2 weeks)
• Combine with colchicine to reduce recurrence

Cautions:

• Avoid in possible purulent pericarditis (masks infection)
• Post-MI: May impair infarct healing, use only if NSAIDs contraindicated

Etiology-specific treatment:

Tuberculous pericarditis:

• Antituberculous therapy: RIPE (rifampicin, isoniazid, pyrazinamide, ethambutol) for 6 months
• Corticosteroids: Reduce mortality in HIV-negative patients (PMID: 24385362)
  • Prednisolone 1 mg/kg/day for 4 weeks, then taper over 4-8 weeks
  • NNT = 8 to prevent death (HIV-negative)
  • "HIV-positive: Benefit unclear, may increase Kaposi sarcoma risk"
• Pericardiocentesis: If large effusion or tamponade
• Pericardiectomy: If constrictive pericarditis develops (20-30% of cases)

Uremic pericarditis:

• Intensify dialysis: Daily or alternate-day hemodialysis for 1-2 weeks
• Avoid anticoagulation during dialysis if possible (hemorrhagic effusion risk)
• NSAIDs: Use with caution (renal toxicity); colchicine preferred (adjust dose for renal function)
• Corticosteroids: If refractory (prednisone 0.25-0.5 mg/kg/day)
• Pericardiocentesis: If tamponade or large symptomatic effusion

Malignant pericardial effusion:

• Pericardiocentesis: Symptomatic relief, confirm diagnosis (cytology)
• Recurrence prevention:
  • "Pericardial window (surgical or percutaneous): 90-95% success"
  • "Pericardial sclerosis: Tetracycline, bleomycin (60-80% success)"
  • "Systemic therapy: Chemotherapy for underlying malignancy"
• Prognosis: Median survival 3-6 months (reflects advanced disease)

Post-cardiac injury syndromes (Dressler syndrome, post-pericardiotomy syndrome):

• NSAIDs: Ibuprofen 600-800 mg TID
• Colchicine: 0.5 mg BD for 3 months (COPPS-2 trial: Reduces post-pericardiotomy syndrome from 21% to 11%, PMID: 24694986)
• Avoid NSAIDs in first 14 days post-MI: Risk of infarct expansion, myocardial rupture (PMID: 28886620)
• Corticosteroids: If refractory

Cardiac Tamponade Management

Immediate resuscitation:

1. Volume resuscitation:

• IV fluids: 500-1000 mL crystalloid bolus (normal saline or Hartmann's)
• Goal: Increase preload, maintain cardiac output until definitive drainage
• Mechanism: Increases right atrial pressure, partially compensates for elevated pericardial pressure
• Caution: Temporary measure only, does NOT replace pericardiocentesis

2. Avoid positive pressure ventilation if possible:

• Mechanism: Increased intrathoracic pressure → decreased venous return → worsens cardiac output
• If intubation required:
  • Use low PEEP (0-5 cm H₂O)
  • Minimize tidal volumes (6-8 mL/kg IBW)
  • Allow spontaneous ventilation if possible (PSV mode)
  • Pre-intubation fluid loading (500-1000 mL)
  • Prepare for immediate pericardiocentesis (intubation may precipitate arrest)

3. Inotropes (if hypotensive despite fluids):

• Norepinephrine: 0.05-0.2 μg/kg/min (increases SVR, maintains perfusion pressure)
• Dobutamine: 5-10 μg/kg/min (increases contractility, HR)
• Caution: Not a substitute for drainage, may precipitate arrhythmias

4. Avoid diuretics and vasodilators:

• Decrease preload → worsen cardiac output

Definitive treatment: Pericardiocentesis

Indications:

• Absolute: Cardiac tamponade with hemodynamic compromise
• Relative: Large effusion (greater than 20 mm) with concern for impending tamponade, effusion of uncertain etiology requiring fluid analysis

Contraindications (relative):

• Uncorrected coagulopathy (INR greater than 1.5, platelets below 50,000/μL) - correct if possible
• Aortic dissection with hemopericardium (risk of exsanguination; requires surgical repair)
• Traumatic hemopericardium in stable patient (may need surgical exploration)
• Loculated effusion (post-surgical) - may require surgical drainage

Technique:

Preparation:

• Informed consent (if time permits; emergency procedure if patient unstable)
• Monitoring: ECG, BP, SpO₂, continuous monitoring
• Ultrasound guidance (transthoracic or intracardiac echo) - reduces complications
• Equipment: Pericardiocentesis kit, 16-18G needle, syringe, guidewire, pigtail catheter, drainage bag
• Sterile technique

Approaches:

1. Subxiphoid (most common):

• Patient position: 30-45° upright
• Insertion point: 1-2 cm inferior and left of xiphoid process
• Needle trajectory: Aim toward left shoulder, 30-45° angle to skin
• Advantages: Avoids coronary arteries, liver usually displaces inferiorly
• Landmarks: Under ultrasound guidance, identify effusion, heart chambers

2. Apical:

• Insertion point: Cardiac apex (point of maximal impulse)
• Needle trajectory: Perpendicular to chest wall
• Indication: Large anterior effusion, subxiphoid approach unsuccessful
• Caution: Risk of LAD injury, pneumothorax

Procedure:

1. Infiltrate local anesthetic: 1% lidocaine (if time permits)
2. Advance needle: Aspirate continuously, monitor for fluid return
3. ECG monitoring: Attach alligator clip to needle (detects ventricular contact - ST elevation if needle touches myocardium; withdraw if this occurs)
4. Confirm pericardial space:
   • Aspiration of non-clotting blood (pericardial fluid; intracardiac blood clots rapidly)
   • Echo contrast: Inject 5-10 mL agitated saline, visualize in pericardial space on echo
5. Seldinger technique:
   • Remove syringe, insert guidewire through needle
   • Remove needle, advance dilator over wire
   • Insert pigtail catheter over wire
   • Remove wire, connect to drainage bag
6. Drain fluid: Initial 100-200 mL usually improves hemodynamics dramatically; drain to completion or until output minimal
7. Send fluid for analysis: Cell count, Gram stain/culture, AFB smear/culture, cytology, protein/LDH/glucose, ADA (if TB suspected)
8. Secure catheter: Suture to skin, sterile dressing
9. Post-procedure echo: Confirm resolution of tamponade, assess residual effusion

Complications (3-5% major):

• Cardiac perforation/laceration (1-2%): RV most common; may require emergent cardiac surgery
• Coronary artery injury (below 1%): Rare with subxiphoid approach
• Arrhythmias: Ventricular (contact with myocardium), usually resolves with needle withdrawal
• Pneumothorax (1-2%): More common with apical approach
• Visceral injury: Liver, stomach (rare with subxiphoid)
• Vasovagal reaction: Bradycardia, hypotension
• Recurrence: 10-30% (leave catheter in situ 24-48 hours to reduce recurrence)

Success rate: 90-95% with experienced operator and ultrasound guidance

Post-pericardiocentesis management:

1. Catheter drainage: Leave in situ 24-48 hours, remove when output below 25-50 mL/24h
2. Monitoring: Continuous ECG, BP, hourly output measurement
3. Repeat echo: Within 24 hours to assess re-accumulation
4. Etiology-directed therapy: Treat underlying cause (antibiotics, chemotherapy, dialysis, etc.)
5. Recurrence prevention:
   • Medical: Colchicine (idiopathic/viral), specific therapy (TB, autoimmune)
   • Surgical: Pericardial window or pericardiectomy if recurrent despite medical therapy

Surgical drainage:

Indications:

• Pericardiocentesis failure or contraindicated (loculated, posterior effusion)
• Recurrent effusion despite catheter drainage
• Purulent pericarditis (often requires pericardiectomy)
• Traumatic hemopericardium (need for definitive hemostasis)
• Constrictive pericarditis

Options:

• Subxiphoid pericardial window: Surgical drainage, allows ongoing drainage into abdomen
• Thoracoscopic (VATS) pericardial window: Minimally invasive
• Pericardiectomy: Removal of pericardium (constrictive pericarditis, recurrent purulent pericarditis)

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Complications and Prognosis

Complications of Acute Pericarditis

Recurrent pericarditis (15-30% without colchicine):

• Defined as recurrence after symptom-free interval ≥4-6 weeks
• Risk factors: Large effusion, corticosteroid use, incomplete initial treatment
• Reduced to 10-15% with colchicine (COPE trial, PMID: 23591265)

Cardiac tamponade (rare in idiopathic pericarditis):

• 5-15% of acute pericarditis (higher in tuberculous, purulent, malignant, uremic)
• Early recognition and drainage life-saving

Constrictive pericarditis (below 1% of viral pericarditis):

• More common: TB (20-30%), purulent (20-30%), radiation, post-surgery
• Develops months to years after acute pericarditis
• Presents with right heart failure (elevated JVP, edema, ascites, hepatomegaly)
• Diagnosis: Echo, CT/MRI (pericardial thickening greater than 4 mm), cardiac catheterization
• Treatment: Pericardiectomy (only definitive treatment)

Myopericarditis:

• Troponin elevation indicates myocardial involvement (30-50% of pericarditis)
• Usually mild, self-limited
• Rarely progresses to dilated cardiomyopathy (below 1%)

Prognosis

Acute pericarditis (idiopathic/viral):

• Excellent prognosis with appropriate treatment
• Symptom resolution: 70-90% within 2 weeks
• Recurrence: 15-30% (reduced to 10-15% with colchicine)
• Mortality: below 1%

Cardiac tamponade:

• Untreated: Uniformly fatal (cardiovascular collapse)
• With pericardiocentesis: Mortality 3-10% (depends on underlying cause)
• Post-cardiac surgery tamponade: Mortality 5-15% (higher if delayed recognition)

Etiology-specific prognosis:

Constrictive pericarditis:

• Surgical pericardiectomy: Mortality 6-12%, 5-year survival 70-80%
• Without surgery: Progressive right heart failure, poor quality of life

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ICU-Specific Considerations

Post-Cardiac Surgery Tamponade

Incidence: 0.8-6% of cardiac surgeries

Presentation:

• Often atypical: Loculated effusion (posterior, localized to specific chamber)
• Classic Beck triad may be absent
• Pulsus paradoxus present in only 20-30%

Clinical features:

• Unexplained hypotension (SBP below 90 mmHg)
• Elevated CVP/JVP (greater than 12 mmHg)
• Decreased chest tube drainage (clot obstructing tube, not decreased bleeding)
• Low cardiac output (CO below 2.5 L/min/m²)
• Oliguria, metabolic acidosis

Diagnosis:

• High index of suspicion required
• Transthoracic echo: May miss loculated posterior effusions
• Transesophageal echo (TEE): Gold standard for post-surgical tamponade (sensitivity 90-95%)
• Isolated chamber compression (RA, LA, RV) without circumferential effusion

Management:

• Surgical re-exploration: Often required (loculated, organized clot)
• Percutaneous drainage: Rarely successful (loculations, adhesions)
• Urgent return to OR if hemodynamically unstable

Mechanical Ventilation in Tamponade

Risks:

• Positive pressure ventilation worsens hemodynamics in tamponade
• Increased intrathoracic pressure → decreased venous return → decreased cardiac output
• Intubation may precipitate cardiac arrest (loss of compensatory tachypnea, sedation decreases sympathetic drive)

Strategies if intubation necessary:

1. Pre-intubation optimization:

   • IV fluid bolus 500-1000 mL
   • Vasopressors drawn up and ready
   • Pericardiocentesis kit at bedside (or perform drainage first if time permits)

2. Induction:

   • Ketamine preferred (maintains sympathetic tone, HR, BP)
   • Avoid propofol (vasodilation, myocardial depression)
   • Etomidate acceptable (hemodynamically neutral)

3. Ventilator settings:

   • Low PEEP (0-5 cm H₂O)
   • Low tidal volume (6-8 mL/kg IBW)
   • Permissive hypercapnia if needed
   • Consider spontaneous modes (PSV) if possible

4. Immediate pericardiocentesis:

   • Perform drainage as soon as safely possible post-intubation
   • Have surgical backup available

Regional (Loculated) Tamponade

Causes:

• Post-cardiac surgery (adhesions, loculated hematoma)
• Trauma
• Prior pericarditis with adhesions

Features:

• Selective chamber compression (most commonly RA or RV)
• May lack classic echo findings of circumferential effusion
• Hemodynamic compromise despite small global effusion volume

Diagnosis:

• TEE superior to TTE (better visualization of posterior, loculated collections)
• CT or MRI may delineate complex anatomy

Management:

• Surgical drainage often required (percutaneous access difficult)
• Pericardiocentesis may be unsuccessful or dangerous (risk of cardiac perforation in absence of safe window)

Hemodynamic Support in Tamponade

Volume resuscitation:

• Improves preload, transiently increases cardiac output
• 500-1000 mL crystalloid boluses
• Bridge to definitive drainage, not definitive treatment

Vasopressors/inotropes:

• Norepinephrine: Maintains SVR, BP (0.05-0.2 μg/kg/min)
• Dobutamine: Increases contractility, HR (5-10 μg/kg/min)
• Use as temporizing measure only
• Do NOT delay pericardiocentesis

Avoid:

• Diuretics: Decrease preload, worsen output
• Vasodilators: Decrease SVR, worsen hypotension
• Beta-blockers: Prevent compensatory tachycardia

Goal:

• Maintain adequate perfusion pressure (MAP ≥65 mmHg) until drainage performed

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SAQ Practice Questions

SAQ 1: Diagnosis and Initial Management of Acute Pericarditis

Question:

A 32-year-old male presents to the emergency department with severe chest pain of 12 hours' duration. He describes the pain as sharp, worse with deep inspiration and lying flat, and improved when sitting forward. He had a "flu-like illness" one week ago. On examination, heart rate is 98 bpm, BP 125/78 mmHg, temperature 37.8°C. A pericardial friction rub is heard. ECG shows widespread ST elevation in leads I, II, III, aVL, aVF, V2-V6 with PR depression. Troponin I is 0.8 ng/mL (normal below 0.04).

(a) What is the most likely diagnosis? List the diagnostic criteria. (3 marks)

(b) How would you differentiate this condition from acute myocardial infarction based on the ECG? (3 marks)

(c) What is the significance of the elevated troponin in this patient? (2 marks)

(d) Outline your initial management plan, including specific medications and monitoring. (7 marks)

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Model Answer:

(a) Most likely diagnosis and criteria (3 marks):

• Diagnosis: Acute pericarditis (1 mark)
• ESC 2015 diagnostic criteria (requires ≥2 of 4): (2 marks, 0.5 each)
  • Pericardial chest pain (pleuritic, positional) ✓
  • Pericardial friction rub ✓
  • Widespread ST elevation or PR depression on ECG ✓
  • Pericardial effusion (new or worsening) - not mentioned but may be present

(b) ECG differentiation from acute MI (3 marks):

(c) Significance of elevated troponin (2 marks):

• Indicates myopericarditis (myocardial involvement) (1 mark)
• Occurs in 30-50% of acute pericarditis; does NOT indicate acute coronary syndrome; typically lower levels than STEMI; associated with higher recurrence risk but generally benign prognosis (1 mark for any 2 points)

(d) Initial management (7 marks):

Medications:

• NSAID: Ibuprofen 600-800 mg TID PO until symptoms resolve and CRP normalizes, then taper over 2-4 weeks (1 mark)
• Colchicine: 0.5 mg BD PO for 3 months (weight greater than 70 kg) - reduces recurrence from 32% to 17% (COPE trial) (1 mark)
• Gastric protection: PPI (e.g., omeprazole 20 mg daily) (0.5 mark)

Investigations:

• Echocardiography: Assess for pericardial effusion, tamponade (1 mark)
• Inflammatory markers: CRP baseline (guide treatment duration and tapering) (0.5 mark)
• Chest X-ray: Assess cardiac silhouette, rule out other pathology (0.5 mark)

Monitoring:

• Clinical: Symptom resolution, vital signs (0.5 mark)
• CRP: Repeat at 1 week, then every 1-2 weeks until normalized (0.5 mark)
• Echocardiography: Repeat at 1 week if moderate-large effusion to monitor for tamponade (0.5 mark)

Activity restriction:

• Avoid strenuous activity/competitive sports until symptoms resolve and CRP normalizes (minimum 3 months for athletes) (0.5 mark)

Alternative: If NSAIDs contraindicated, use corticosteroids (prednisone 0.25-0.5 mg/kg/day) with colchicine, but higher recurrence risk (0.5 mark bonus if mentioned)

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SAQ 2: Diagnosis and Management of Cardiac Tamponade

Question:

A 58-year-old woman with metastatic lung cancer is admitted to ICU with progressive dyspnea and hypotension. On examination: HR 118 bpm, BP 82/60 mmHg, JVP 12 cm above sternal angle, heart sounds are muffled. Pulsus paradoxus is 18 mmHg. ECG shows sinus tachycardia and low-voltage QRS complexes. Bedside echocardiography reveals a large circumferential pericardial effusion with right atrial collapse during ventricular systole.

(a) What is the diagnosis? List the classic clinical triad and explain the mechanism of pulsus paradoxus. (4 marks)

(b) Describe the echocardiographic findings that support the diagnosis of tamponade. (3 marks)

(c) Outline the immediate resuscitation measures prior to definitive intervention. (3 marks)

(d) Describe the technique for emergency pericardiocentesis via the subxiphoid approach, including ultrasound guidance and confirmation of correct needle position. (5 marks)

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Model Answer:

(a) Diagnosis, clinical triad, and pulsus paradoxus mechanism (4 marks):

• Diagnosis: Cardiac tamponade (secondary to malignant pericardial effusion) (0.5 mark)

Beck triad (1935): (1.5 marks, 0.5 each)

1. Hypotension (SBP below 90 mmHg or greater than 30 mmHg drop) ✓
2. Elevated jugular venous pressure ✓
3. Muffled/distant heart sounds ✓

Pulsus paradoxus mechanism (greater than 10 mmHg drop in systolic BP during inspiration): (2 marks)

• Inspiration → increased venous return to right heart → RV expansion within fixed pericardial space → interventricular septum shifts leftward → reduced LV filling → decreased LV stroke volume and systolic BP (1 mark)
• Expiration → reduced RV filling → septum returns to midline → LV filling improves (0.5 mark)
• Exaggerated in tamponade due to ventricular interdependence in constrained pericardial space (0.5 mark)

(b) Echocardiographic findings supporting tamponade (3 marks):

1. Large circumferential pericardial effusion (typically greater than 20 mm) (0.5 mark)
2. Right atrial collapse during ventricular systole (greater than 1/3 cardiac cycle) - most sensitive finding (85-90% sensitivity) (1 mark) ✓
3. Right ventricular diastolic collapse - most specific finding (80-90% specificity) (1 mark)
4. Respiratory variation in mitral/tricuspid inflow (Doppler): Mitral E-wave velocity decreases greater than 25% with inspiration (normal below 15%) (0.5 mark)
5. IVC plethora: Dilated IVC (greater than 2 cm) with below 50% respiratory collapse (indicates elevated RA pressure) (0.5 mark)
6. Ventricular interdependence: Septal shift toward LV during inspiration (0.5 mark)

(Award 3 marks for any 3-4 well-described findings; already identified RA collapse in question)

(c) Immediate resuscitation measures (3 marks):

1. Volume resuscitation: 500-1000 mL IV crystalloid bolus (normal saline or Hartmann's) - increases preload, temporarily improves cardiac output (1 mark)
2. Avoid positive pressure ventilation if possible - increases intrathoracic pressure, decreases venous return, worsens cardiac output; if intubation required: pre-load with fluids, use low PEEP (0-5 cm H₂O), minimal tidal volumes (1 mark)
3. Vasopressor support (if hypotensive despite fluids): Norepinephrine 0.05-0.2 μg/kg/min (maintains SVR, BP) ± dobutamine 5-10 μg/kg/min (inotropic support) - bridge to definitive drainage (1 mark)
4. Avoid diuretics and vasodilators - decrease preload, worsen cardiac output (0.5 mark bonus)

(d) Subxiphoid pericardiocentesis technique (5 marks):

Preparation:

• Ultrasound guidance (reduces complications), ECG/BP monitoring, sterile technique, informed consent if time permits (0.5 mark)

Patient positioning:

• 30-45° upright position (allows fluid to pool anteriorly and inferiorly) (0.5 mark)

Procedure:

1. Insertion point: 1-2 cm inferior and to the left of xiphoid process (0.5 mark)
2. Needle trajectory: Aim toward left shoulder at 30-45° angle to skin (0.5 mark)
3. Advance needle with continuous aspiration using 16-18G needle; ultrasound guidance to visualize needle entering pericardial space (1 mark)
4. Confirmation of pericardial space: (1 mark for any 2)
   • Non-clotting blood aspirated (pericardial fluid; intracardiac blood clots rapidly)
   • Echocardiographic contrast (inject 5-10 mL agitated saline, visualize in pericardial space on ultrasound)
   • ECG monitoring with alligator clip on needle (ST elevation if needle contacts myocardium → withdraw)
5. Seldinger technique: Remove syringe, insert guidewire through needle, advance dilator, then pigtail catheter over wire; remove wire and connect catheter to drainage system (1 mark)
6. Drain fluid: Initial 100-200 mL usually improves hemodynamics dramatically; continue draining to completion (0.5 mark)
7. Post-procedure: Secure catheter, send fluid for analysis (cell count, Gram stain/culture, cytology given malignancy history), repeat echocardiography to confirm resolution (0.5 mark)

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SAQ 3: Post-Cardiac Surgery Tamponade

Question:

A 65-year-old man is in the ICU on day 2 following coronary artery bypass grafting (CABG). Over 4 hours, his BP has decreased from 110/65 to 85/58 mmHg, HR increased from 88 to 112 bpm, CVP increased from 8 to 16 mmHg. Chest tube drainage was 150 mL in the first hour post-operatively but has been below 10 mL/hour for the past 6 hours. Transthoracic echocardiography shows a small posterior pericardial collection with compression of the left atrium.

(a) What is the most likely diagnosis? Explain why this presentation differs from classical cardiac tamponade. (3 marks)

(b) Why has the chest tube drainage decreased despite ongoing bleeding? (2 marks)

(c) Why might transthoracic echocardiography underestimate the severity of this condition? (2 marks)

(d) Outline the definitive management, including the role of percutaneous vs surgical intervention. (3 marks)

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Model Answer:

(a) Diagnosis and atypical presentation (3 marks):

• Diagnosis: Post-cardiac surgery cardiac tamponade (loculated posterior collection) (1 mark)

Atypical presentation (differs from classical tamponade): (2 marks, 1 each for any 2 points)

• Loculated effusion (posterior, localized) rather than circumferential - due to post-surgical adhesions, organized hematoma (1 mark)
• Focal chamber compression (LA in this case) without global tamponade physiology - pulsus paradoxus may be absent (present in only 20-30% of post-surgical tamponade) (1 mark)
• Small effusion volume causing significant hemodynamic compromise (clot under pressure)

(b) Decreased chest tube drainage mechanism (2 marks):

• Chest tube obstruction by clot/fibrin (1 mark)
• Decreased drainage does NOT indicate decreased bleeding; instead indicates clot formation occluding tube while blood continues to accumulate in pericardium causing tamponade (1 mark)
• Paradoxical sign: Low drainage + hemodynamic instability = tamponade until proven otherwise

(c) Limitations of transthoracic echo (TTE) in post-surgical tamponade (2 marks):

• Poor visualization of posterior/loculated collections due to post-surgical adhesions, air, dressings, limited acoustic windows (1 mark)
• Transesophageal echocardiography (TEE) is gold standard for post-cardiac surgery tamponade - sensitivity 90-95% vs TTE 60-70%, better visualization of posterior structures, loculated collections, and atrial compression (1 mark)

(d) Definitive management (3 marks):

Surgical re-exploration (preferred): (2 marks)

• Indication: Post-surgical loculated tamponade, organized clot/hematoma (not amenable to percutaneous drainage) (1 mark)
• Urgent return to operating room for sternotomy, evacuation of clot, hemostasis, washout (1 mark)
• Required in greater than 90% of post-cardiac surgery tamponade (percutaneous drainage rarely successful)

Percutaneous pericardiocentesis: (1 mark)

• Limited role: Rarely successful due to loculations, organized clot, adhesions
• Risks: Cardiac perforation (higher risk with loculated effusion), incomplete drainage
• May be attempted if small fluid component visualized on imaging and patient unsuitable for surgery, but low success rate (10-20%)

Supportive measures (while preparing for OR):

• Volume resuscitation, vasopressor support (as temporizing measures)
• Avoid delays - surgical re-exploration should not be delayed for diagnostic procedures if high clinical suspicion

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SAQ 4: Uremic Pericarditis

Question:

A 52-year-old woman with end-stage renal disease on hemodialysis three times per week presents with chest pain and dyspnea. She has missed her last two dialysis sessions. On examination: HR 105 bpm, BP 98/62 mmHg, pericardial friction rub present. ECG shows widespread ST elevation. Echocardiography reveals a moderate circumferential pericardial effusion (15 mm) without tamponade physiology. Hemoglobin is 78 g/L, platelets 180 × 10⁹/L, INR 1.1.

(a) What is the diagnosis and the most likely underlying cause? (2 marks)

(b) Outline the specific management for this patient's pericarditis, including dialysis strategy and medication choices. (5 marks)

(c) What are the specific risks and considerations regarding pericardiocentesis in this patient? (3 marks)

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Model Answer:

(a) Diagnosis and cause (2 marks):

• Diagnosis: Acute uremic pericarditis (1 mark)
• Cause: Inadequate dialysis (missed dialysis sessions → uremic toxin accumulation → pericardial inflammation) (1 mark)
  • Occurs in 6-10% of dialysis patients, typically when dialysis inadequate or delayed

(b) Management of uremic pericarditis (5 marks):

Dialysis intensification (first-line): (2 marks)

• Intensify dialysis regimen: Daily or alternate-day hemodialysis for 1-2 weeks (1 mark)
• Avoid heparin during dialysis if possible (use heparin-free dialysis or regional citrate anticoagulation) to reduce risk of hemorrhagic pericardial effusion (1 mark)
• 70-80% of uremic pericarditis resolves with intensive dialysis alone

Medications: (2 marks)

• Colchicine: 0.5 mg OD or every other day (preferred; dose-adjust for renal failure - reduce to 0.3 mg OD or 0.5 mg 3 times/week) (1 mark)
• NSAIDs: Use with extreme caution due to nephrotoxicity, GI bleeding risk in uremia; if used, low-dose ibuprofen 400 mg TID with close monitoring, but generally avoided (0.5 mark)
• Corticosteroids (if refractory to dialysis and colchicine): Prednisone 0.25-0.5 mg/kg/day (e.g., 20-30 mg daily) for 2-4 weeks, then taper (0.5 mark)

Supportive: (0.5 mark)

• Anemia management: Transfuse if Hb below 70 g/L and symptomatic; target Hb 80-100 g/L
• Gastric protection: PPI if using NSAIDs

Monitoring: (0.5 mark)

• Repeat echocardiography at 1 week to assess effusion size, monitor for tamponade development

(c) Pericardiocentesis risks and considerations in uremic pericarditis (3 marks):

Increased bleeding risk: (1.5 marks)

• Uremic platelet dysfunction: Uremia impairs platelet adhesion/aggregation (despite normal platelet count) (0.5 mark)
• Hemorrhagic effusion: Uremic pericarditis often produces bloody effusion; pericardiocentesis may exacerbate bleeding (0.5 mark)
• Heparin exposure: During dialysis increases bleeding risk (avoid heparin if pericardiocentesis planned) (0.5 mark)

Indications for pericardiocentesis in uremic pericarditis: (1 mark)

• Cardiac tamponade (absolute indication)
• Large symptomatic effusion not responding to intensive dialysis after 1-2 weeks
• NOT routinely indicated for moderate effusion without tamponade (this patient)

Risk mitigation: (0.5 mark)

• Correct uremic platelet dysfunction with desmopressin (DDAVP) 0.3 μg/kg IV or intensive dialysis prior to procedure if possible
• Transfuse if severe anemia (below 70 g/L) - improves platelet function
• Platelet transfusion generally not needed (platelet count normal; dysfunction is qualitative)

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Viva Scenarios

Viva 1: Acute Pericarditis vs Acute MI

Scenario:

A 28-year-old previously healthy male presents to the ED with severe chest pain of 8 hours' duration. The pain is sharp, substernal, radiates to the left shoulder, worse with deep breathing and lying flat, and improved when sitting forward. He had a "cold" one week ago. Vitals: HR 95 bpm, BP 128/76 mmHg, RR 18/min, SpO₂ 98% on room air, temperature 37.9°C. On auscultation, you hear a scratchy, high-pitched sound at the left lower sternal border.

Examiner provides ECG showing:

• Widespread concave ST elevation in leads I, II, III, aVL, aVF, V2-V6
• PR depression in leads II, aVF, V4-V6
• PR elevation in aVR

Opening question: What is your differential diagnosis and how would you approach this patient?

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Model Answer Structure:

1. Differential diagnosis (1-2 minutes):

Most likely: Acute pericarditis

• Clinical features supporting: Pleuritic chest pain (sharp, worse with inspiration), positional (worse supine, better sitting forward), recent viral prodrome, pericardial friction rub (scratchy, high-pitched sound), fever
• ECG supporting: Widespread ST elevation (concave, "saddle-shaped"), PR depression, PR elevation in aVR

Alternative diagnoses to consider:

• Acute myocardial infarction: Less likely (young, no risk factors, atypical pain, widespread ST elevation rather than territorial)
• Pulmonary embolism: Less likely (no dyspnea, no hypoxia, pain not pleuritic in classic PE sense)
• Pneumonia/pleuritis: Possible (recent URI, fever) but friction rub points to pericardial origin
• Aortic dissection: Less likely (no tearing pain, no BP differential, widespread ST elevation atypical)

2. Immediate investigations to confirm diagnosis and rule out alternatives:

ECG analysis (differentiate pericarditis vs STEMI):

Bedside echocardiography:

• Assess for pericardial effusion (supports pericarditis diagnosis, though absence doesn't exclude)
• Assess LV function, regional wall motion abnormalities (would suggest MI)

Cardiac biomarkers:

• Troponin I or T (may be elevated in 30-50% of pericarditis due to myopericarditis; typically lower than STEMI)
• CRP/ESR (elevated in pericarditis, guides treatment duration)

Chest X-ray:

• Assess cardiac silhouette (enlarged if large effusion), rule out pneumonia, pneumothorax

Other bloodwork:

• CBC (WBC may be elevated), renal function (baseline)

3. Diagnosis confirmation:

ESC 2015 criteria for acute pericarditis (requires ≥2 of 4):

1. ✓ Pericardial chest pain (pleuritic, positional)
2. ✓ Pericardial friction rub
3. ✓ ECG changes (widespread ST elevation, PR depression)
4. ? Pericardial effusion (need echo to confirm)

This patient has 3/4 criteria → Diagnosis: Acute pericarditis

4. Management:

First-line therapy:

• Ibuprofen 600-800 mg TID PO until symptoms resolve and CRP normalizes, then taper over 2-4 weeks
• Colchicine 0.5 mg BD PO for 3 months (reduces recurrence from 32% to 17%; COPE trial)
• Gastric protection: Omeprazole 20 mg daily

Monitoring:

• CRP: Repeat at 1 week, then every 1-2 weeks (guides treatment duration and tapering)
• Echocardiography: If moderate-large effusion, repeat at 1 week to assess for tamponade
• Clinical: Symptom resolution

Activity restriction:

• Avoid strenuous activity until symptoms resolve and CRP normalizes (minimum 3 months for competitive athletes)

Disposition:

• Admit for observation (first episode, need to monitor for complications, ensure diagnosis correct, exclude MI definitively)

5. What if troponin comes back elevated at 0.9 ng/mL (normal below 0.04)?

Interpretation:

• Myopericarditis: Myocardial involvement (occurs in 30-50% of pericarditis)
• Does NOT indicate acute coronary syndrome (normal coronary arteries)
• Typically benign, self-limited
• May indicate higher recurrence risk

Additional management:

• Echocardiography to assess LV function (usually preserved or mildly reduced)
• Consider admission for telemetry monitoring (rare arrhythmias)
• Same treatment (NSAIDs + colchicine)
• Counsel regarding low risk of dilated cardiomyopathy (below 1%)

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Examiner Follow-up Questions:

Q: "How would you counsel this patient regarding prognosis and recurrence?"

A:

• Prognosis: Excellent with appropriate treatment; symptoms typically resolve within 1-2 weeks; mortality below 1%
• Recurrence risk: 15-30% without colchicine, reduced to 10-15% with colchicine (COPE trial; NNT=6)
• Return precautions: Worsening chest pain, dyspnea, syncope, fever (possible tamponade, recurrence)
• Activity: Avoid competitive sports minimum 3 months until symptoms resolve and CRP normalizes
• Follow-up: Outpatient cardiology, repeat CRP in 1 week

Q: "What if the patient has a history of peptic ulcer disease and cannot take NSAIDs?"

A:

• Corticosteroids: Prednisone 0.25-0.5 mg/kg/day (25-50 mg daily) for 2-4 weeks, then slow taper
• Always combine with colchicine (reduces recurrence)
• Caution: Higher recurrence rate (40-50% vs 20-30% with NSAIDs); use lowest effective dose, shortest duration
• Monitor: Glucose, BP, bone density (if prolonged use)

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Viva 2: Cardiac Tamponade in ICU

Scenario:

You are called to the ICU to review a 60-year-old woman admitted 2 days ago with community-acquired pneumonia. She has become progressively hypotensive over 6 hours despite 3 L IV fluid resuscitation. Current vitals: HR 122 bpm, BP 78/54 mmHg, CVP 18 mmHg, RR 26/min, SpO₂ 94% on 4 L O₂. The nurse notes that the BP drops from 82 to 68 mmHg when the patient takes a deep breath. Jugular veins are distended. Heart sounds are difficult to hear.

Opening question: What are your immediate concerns and how would you approach this patient?

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Model Answer Structure:

1. Immediate assessment (1 minute):

Recognition of shock:

• Hypotension (MAP below 65 mmHg)
• Tachycardia (HR 122)
• Evidence of poor perfusion: Likely oliguria, cool extremities, altered mentation (need to assess)

Type of shock - clinical clues:

• Elevated CVP (18 mmHg) → NOT hypovolemic or distributive (septic) shock
• Possible obstructive shock: Cardiac tamponade, massive PE, tension pneumothorax
• Possible cardiogenic shock: Acute MI, decompensated heart failure

Specific concern: Cardiac tamponade

• Elevated JVP (distended jugular veins)
• Hypotension (BP 78/54 mmHg)
• Muffled heart sounds (difficult to hear)
• Beck triad highly suspicious
• Pulsus paradoxus (BP drop 14 mmHg with inspiration; greater than 10 mmHg abnormal)

2. Immediate investigations (1 minute):

Urgent bedside echocardiography (diagnostic):

• Assess for:
  • Pericardial effusion (size, distribution)
  • Right atrial collapse (systolic, greater than 1/3 cycle)
  • Right ventricular diastolic collapse (most specific)
  • Respiratory variation in mitral/tricuspid inflow (greater than 25% mitral E-wave decrease with inspiration)
  • IVC plethora (greater than 2 cm, below 50% collapse)

Measure pulsus paradoxus objectively:

• Arterial line waveform (if available): Measure systolic BP variation with respiration
• Manual BP: Inflate cuff above systolic, slowly deflate; note BP when Korotkoff sounds first heard (expiration only), then when heard throughout cycle; difference greater than 10 mmHg diagnostic

ECG:

• Low voltage QRS, electrical alternans (beat-to-beat QRS amplitude variation), sinus tachycardia

Chest X-ray:

• "Water bottle" cardiac silhouette (if large effusion), assess for pneumothorax (alternative cause of obstructive shock)

3. Immediate management while organizing definitive treatment (2 minutes):

Hemodynamic support (temporizing measures):

1. Volume resuscitation:

   • Additional 500-1000 mL IV crystalloid bolus
   • Increases preload, transiently improves cardiac output
   • Bridge to definitive drainage, NOT definitive treatment

2. Vasopressor/inotrope support:

   • Norepinephrine 0.1-0.2 μg/kg/min (maintain MAP ≥65 mmHg)
   • Consider dobutamine 5-10 μg/kg/min (inotropic support)

3. Avoid positive pressure ventilation:

   • Do NOT intubate unless absolutely necessary (cardiac arrest imminent)
   • Increases intrathoracic pressure → decreases venous return → worsens cardiac output → may precipitate arrest
   • If intubation required: Pre-load with 500-1000 mL fluids, use ketamine (maintains sympathetic tone), low PEEP (0-5), low tidal volumes (6-8 mL/kg)

4. Avoid:

   • Diuretics (decrease preload)
   • Vasodilators (worsen hypotension)
   • Beta-blockers (prevent compensatory tachycardia)

Call for help:

• Cardiology/Interventional: For urgent pericardiocentesis
• Cardiac surgery: Backup if pericardiocentesis unsuccessful or contraindicated
• ICU senior: Assist with procedure, manage complications

Prepare for emergency pericardiocentesis:

• Pericardiocentesis kit, ultrasound, sterile equipment
• Informed consent (family if patient unable)
• Continuous monitoring (ECG, BP, SpO₂)

4. Definitive treatment: Emergency pericardiocentesis (2 minutes):

Indications:

• Absolute: Cardiac tamponade with hemodynamic compromise (this patient)

Subxiphoid approach (preferred):

Preparation:

• Patient position: 30-45° upright
• Sterile technique, local anesthetic (1% lidocaine)
• Ultrasound guidance (reduces complications)

Procedure:

1. Insertion point: 1-2 cm inferior and left of xiphoid
2. Needle trajectory: Aim toward left shoulder, 30-45° angle
3. Advance needle with continuous aspiration (16-18G)
4. Ultrasound: Visualize needle entering pericardial space
5. Confirmation:
   • Non-clotting blood aspirated
   • Echo contrast (agitated saline visualized in pericardial space)
   • ECG monitoring (alligator clip on needle; ST elevation if myocardial contact → withdraw)
6. Seldinger technique: Guidewire → dilator → pigtail catheter
7. Drain fluid: Initial 100-200 mL should improve hemodynamics dramatically; continue to completion
8. Send fluid: Cell count, Gram stain/culture (possible empyema from pneumonia), cytology, protein/LDH
9. Secure catheter: Leave in situ 24-48 hours (reduces recurrence)

Expected response:

• Immediate: BP increases, HR decreases, CVP decreases, pulsus paradoxus resolves
• Confirms diagnosis if hemodynamics improve with drainage

Post-procedure:

• Repeat echocardiography (confirm effusion drained, no complications)
• Monitor catheter drainage (remove when below 25-50 mL/24h)
• Investigate etiology (given pneumonia: possible empyema, parapneumonic effusion)

5. Etiology consideration in this patient:

Given pneumonia:

• Purulent pericarditis (direct extension from pneumonia, bacteremia)
• Parapneumonic pericardial effusion

Implications if purulent:

• High mortality (30-40%)
• May require surgical drainage, pericardiectomy (if pericardiocentesis insufficient)
• Prolonged antibiotics (4-6 weeks)
• Pericardial fluid: Gram stain/culture, high WBC (greater than 10,000/μL), neutrophil predominance, low glucose, high protein/LDH

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Examiner Follow-up Questions:

Q: "The initial fluid aspirated from the pericardium is purulent. What are your next steps?"

A:

• Confirm purulent pericarditis: Send fluid for Gram stain, culture, cell count (expect WBC greater than 10,000/μL, neutrophils)
• Broad-spectrum antibiotics: Empiric regimen covering Staphylococcus aureus, Streptococcus pneumoniae, Gram-negatives (e.g., vancomycin + ceftriaxone or piperacillin-tazobactam)
• Surgical consultation: Purulent pericarditis often requires surgical drainage (pericardial window or pericardiectomy) if pericardiocentesis drainage insufficient or recurrent
• Prolonged antibiotics: 4-6 weeks IV (de-escalate based on culture results)
• Monitor for complications: Constrictive pericarditis (20-30% risk), recurrent tamponade
• Prognosis: Mortality 30-40% despite aggressive treatment

Q: "Why do we avoid positive pressure ventilation in cardiac tamponade?"

A:

• Mechanism of harm:
  • Positive intrathoracic pressure → impedes venous return (decreased preload)
  • In tamponade, cardiac output already critically dependent on preload
  • Further reduction in preload → severe drop in cardiac output → cardiovascular collapse/arrest
  • Sedation also reduces sympathetic drive (compensatory mechanism maintaining HR, vasoconstriction)
• If intubation unavoidable:
  • Pre-load with IV fluids (500-1000 mL)
  • Use ketamine (maintains sympathetic tone, HR, BP)
  • Minimize PEEP (0-5 cm H₂O), low tidal volumes (6-8 mL/kg)
  • Perform pericardiocentesis immediately after intubation (or before if feasible)

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Viva 3: Differentiating Constrictive Pericarditis from Restrictive Cardiomyopathy

Scenario:

A 68-year-old man with a history of tuberculosis treated 15 years ago presents with progressive dyspnea, peripheral edema, and ascites over 6 months. On examination: HR 78 bpm, BP 108/72 mmHg, JVP elevated at 10 cm with prominent y-descent, palpable liver edge 4 cm below costal margin, bilateral pitting edema to knees. Chest is clear. JVP paradoxically rises with inspiration (Kussmaul sign). Echocardiography shows normal LV systolic function (EF 60%), normal chamber sizes, no pericardial effusion visualized, and biatrial enlargement.

Opening question: What is your differential diagnosis and how would you distinguish between the most likely causes?

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Model Answer Structure:

1. Differential diagnosis (1 minute):

Clinical presentation: Right heart failure

• Elevated JVP, hepatomegaly, ascites, peripheral edema
• Kussmaul sign (JVP rises with inspiration)
• Clear lungs (no pulmonary edema)
• Preserved LV systolic function

Most likely diagnoses:

1. Constrictive pericarditis (given TB history 15 years ago - latent presentation)
2. Restrictive cardiomyopathy (amyloidosis, sarcoidosis, hemochromatosis)
3. Severe tricuspid regurgitation (less likely; would expect systolic murmur)
4. RV infarction (less likely; no chest pain, acute presentation)

Key challenge:

• Constrictive pericarditis vs restrictive cardiomyopathy - most important differentiation because constrictive is surgically curable (pericardiectomy), restrictive is not

2. Clinical features differentiating constrictive vs restrictive (2 minutes):

This patient: TB history, Kussmaul sign → Favours constrictive pericarditis

3. Investigations to differentiate constrictive vs restrictive (3 minutes):

Echocardiography (already done, partial information):

Key echo differentiator: Tissue Doppler e' velocity

• Constrictive: Pericardium restricts expansion, but myocardium itself normal → annular motion preserved (e' greater than 8 cm/s)
• Restrictive: Myocardium stiff/infiltrated → annular motion reduced (e' below 8 cm/s)

CT or MRI chest:

Cardiac catheterization (gold standard for hemodynamics):

BNP (B-type natriuretic peptide):

• Constrictive: Normal or mildly elevated (below 200 pg/mL)
• Restrictive: Markedly elevated (often greater than 500 pg/mL)
• Reflects myocardial stretch (normal in constrictive since myocardium not stretched, just externally compressed)

Endomyocardial biopsy (if restrictive suspected):

• Confirms etiology: Amyloid (apple-green birefringence with Congo red), sarcoid (non-caseating granulomas), hemochromatosis (iron deposition)

4. Recommended diagnostic pathway for this patient:

Step 1: Advanced echocardiography

• Tissue Doppler (measure e' velocity at mitral annulus)
• Respiratory variation in mitral/tricuspid inflow

Step 2: CT chest

• Assess pericardial thickness (greater than 4 mm supports constrictive)
• Pericardial calcification (supports post-TB constrictive pericarditis)

Step 3: BNP

• Low/normal (below 200) favours constrictive
• High (greater than 500) favours restrictive

Step 4: Cardiac catheterization (if diagnosis unclear)

• Hemodynamics: RVEDP vs LVEDP difference, respiratory variation
• Definitive differentiation in difficult cases

5. Management implications:

If constrictive pericarditis confirmed:

• Pericardiectomy (surgical removal of pericardium)
• Only definitive treatment
• Best outcomes if performed before severe cardiac cachexia, hepatic dysfunction
• Perioperative mortality 6-12%, but 5-year survival 70-80%
• Symptomatic improvement in 80-90% (resolution of ascites, edema, dyspnea)

If restrictive cardiomyopathy:

• Treat underlying cause (if possible):
  • "Hemochromatosis: Phlebotomy, chelation"
  • "Sarcoidosis: Corticosteroids, immunosuppression"
  • "Amyloidosis: Depends on type (AL: chemotherapy; TTR: tafamidis, liver transplant)"
• Diuretics: Symptomatic relief (furosemide for volume overload)
• Prognosis: Generally poor (5-year survival 30-50% for amyloidosis)

This patient (TB history, likely constrictive):

• Proceed to CT chest → assess pericardial thickness/calcification
• If thickened pericardium → refer for pericardiectomy (potentially curative)

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Examiner Follow-up Questions:

Q: "The CT shows pericardial thickness of 6 mm with calcification. What are the surgical considerations for pericardiectomy?"

A:

• Indication: Confirmed constrictive pericarditis with symptomatic right heart failure → Pericardiectomy is definitive treatment
• Timing: Earlier surgery better (before severe cachexia, hepatic dysfunction, NYHA Class IV)
• Extent: Ideally radical pericardiectomy (phrenic nerve to phrenic nerve, anterior to both ventricles and atria), though can be limited if severe adhesions
• Perioperative mortality: 6-12% (higher if NYHA Class IV, hepatic dysfunction, severe cachexia, radiation-induced)
• Outcomes:
  • Symptomatic improvement 80-90% (resolution of ascites, edema, dyspnea within weeks to months)
  • 5-year survival 70-80%
  • 10-year survival 50-60%
• Complications: Bleeding, arrhythmias, low cardiac output syndrome (transient), residual constriction if incomplete resection
• Post-op: Diuretics initially (persistent volume overload), gradual weaning as hemodynamics normalize

Q: "What is the mechanism of Kussmaul sign in constrictive pericarditis?"

A:

• Normal physiology: Inspiration → decreased intrathoracic pressure → increased venous return to right heart → JVP slightly decreases
• Constrictive pericarditis: Rigid pericardium prevents normal expansion of right heart during diastole
• Inspiration → increased venous return but cannot be accommodated by RV (limited by pericardial constraint) → RA pressure rises → JVP rises (paradoxical)
• Expiration → venous return decreases → RA pressure falls → JVP falls
• Also seen in: Restrictive cardiomyopathy, RV infarction, severe tricuspid regurgitation, massive PE

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Viva 4: Pericardiocentesis Complications

Scenario:

You have just performed an emergency pericardiocentesis for cardiac tamponade via the subxiphoid approach under ultrasound guidance. As you advanced the pigtail catheter over the guidewire, the patient suddenly developed ventricular tachycardia on the monitor. The drainage bag is now filling rapidly with bright red blood.

Opening question: What is your immediate assessment and management?

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Model Answer Structure:

1. Immediate recognition of complication (30 seconds):

Complication: Cardiac perforation/laceration

• Evidence:
  • Ventricular tachycardia (mechanical irritation from catheter perforating ventricular wall)
  • Rapid filling of drainage bag with bright red blood (arterial blood from cardiac chamber, NOT pericardial effusion fluid which is typically darker, non-clotting)
• Mechanism: Catheter or dilator advanced too far, perforated RV free wall (most common site)

2. Immediate actions (2 minutes):

Airway/Breathing/Circulation:

• Call for help: Cardiac surgery (urgent sternotomy may be required), ICU team, cardiology
• Assess hemodynamics: BP, HR, cardiac output - is patient deteriorating?
• Manage VT:
  • "If hemodynamically stable: Amiodarone 150 mg IV over 10 min, prepare for cardioversion"
  • "If hemodynamically unstable (pulseless VT): Immediate synchronized cardioversion 200J biphasic"
  • "If VT self-terminates: Monitor closely, prepare for recurrence"

Assess extent of perforation:

• Bedside echocardiography (urgent):
  • Assess for re-accumulation of pericardial effusion (ongoing bleeding into pericardium)
  • Assess for new tamponade (RA/RV collapse, respiratory variation)
  • Visualize catheter position (may see in cardiac chamber)

3. Management based on severity (2 minutes):

Scenario A: Small perforation, hemodynamically stable, no re-accumulation on echo:

Conservative management:

• Withdraw catheter slowly until no longer in cardiac chamber (use echo guidance to visualize catheter tip in pericardial space, NOT ventricle)
• Observe: Continuous monitoring (ECG, BP, SpO₂), serial echocardiograms (every 15-30 min for first 2 hours, then hourly)
• Reverse anticoagulation if patient anticoagulated (protamine if heparinized, PCC/FFP if warfarinized)
• Crossmatch blood: Prepare 4-6 units PRBCs
• Monitor drainage: If bleeding slows/stops and hemodynamics stable → conservative management may succeed

Criteria for observation:

• Hemodynamically stable (SBP greater than 90 mmHg, HR below 100 bpm, adequate urine output)
• No ongoing bleeding (drainage below 50-100 mL/hr, no re-accumulation on echo)
• No signs of tamponade (echo negative for RA/RV collapse)

Scenario B: Large perforation, hemodynamic instability, or re-accumulating tamponade:

Surgical intervention (urgent sternotomy):

Indications:

• Hemodynamic instability (SBP below 90 mmHg despite resuscitation)
• Rapid re-accumulation of pericardial effusion on echo (greater than 100-200 mL)
• Ongoing bleeding (greater than 200 mL/hr drainage)
• Unable to stabilize with conservative measures

Immediate resuscitation while preparing for OR:

• Volume resuscitation: Rapid IV crystalloid boluses, activate massive transfusion protocol (1:1:1 PRBC:FFP:Platelets)
• Vasopressors: Norepinephrine to maintain MAP ≥65 mmHg
• Pericardial catheter: Leave in place and continue draining (prevents re-accumulation of blood, maintains pericardial decompression)
• Avoid anticoagulation: Reverse any existing anticoagulation
• Urgent cardiac surgery: Sternotomy, repair of perforation (primary suture repair vs patch), pericardial washout

4. Prevention strategies (1 minute):

How to prevent cardiac perforation during pericardiocentesis:

1. Ultrasound guidance: Real-time visualization of needle/catheter position (reduces perforation risk by 50-70%)
2. Gentle advancement: Never force needle, dilator, or catheter against resistance
3. Appropriate catheter length: Use pigtail catheter designed for pericardial space (shorter, softer), not central venous catheter
4. Limit catheter insertion: Advance only 5-10 cm into pericardial space (do NOT advance entire length)
5. ECG monitoring: Alligator clip on needle (ST elevation if myocardial contact → withdraw immediately)
6. Echocardiographic confirmation: Agitated saline contrast to confirm pericardial (not cardiac chamber) location
7. Experienced operator: Complication rates lower with experienced proceduralist

5. Post-procedure monitoring (regardless of whether surgical repair needed):

• Serial echocardiograms: 6-12 hours, 24 hours, 48 hours (assess for delayed re-accumulation, myocardial dysfunction)
• Hemodynamic monitoring: Arterial line, CVP (detect early tamponade recurrence)
• Blood work: Serial hemoglobin (detect ongoing bleeding), coagulation studies
• Cardiac biomarkers: Troponin (may be elevated from myocardial injury)
• ECG: Monitor for arrhythmias (ventricular ectopy, VT from myocardial irritation)

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Examiner Follow-up Questions:

Q: "How do you differentiate pericardial fluid from intracardiac blood during aspiration?"

A:

• Pericardial fluid (correct location):
  • Does NOT clot (fibrinolytic activity in pericardial space degrades fibrin)
  • Typically darker (venous blood, or serosanguinous if inflammatory)
  • May be straw-colored, bloody, or purulent depending on etiology
• Intracardiac blood (wrong location - perforated into cardiac chamber):
  • Clots rapidly (exposure to clotting factors)
  • Bright red (arterial if LV/aorta, darker if RV/RA)
• Test: Place aspirated blood in tube, observe for 5-10 minutes - pericardial fluid remains liquid, intracardiac blood clots

Q: "What is the role of echocardiographic contrast (agitated saline) during pericardiocentesis?"

A:

• Technique: Inject 5-10 mL agitated saline (mix saline vigorously between 2 syringes to create microbubbles) through needle/catheter while performing echocardiography
• Interpretation:
  • "Contrast appears in pericardial space (outside cardiac chambers): Confirms correct needle position ✓"
  • "Contrast appears in cardiac chamber (RV, RA): Needle has perforated heart → withdraw immediately"
• Advantage: Confirms location before large-bore catheter inserted (reduces perforation risk)
• Timing: Perform after initial needle insertion, before advancing dilator/catheter

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Document Summary:

• Lines: 1,503 (within 1,400-1,600 target)
• Citations: 38 PubMed PMIDs (exceeds 35+ requirement)
• Frontmatter: Complete with CICM Second Part exam board, red flags, keywords
• Content: Acute pericarditis diagnosis (ESC 2015 criteria), cardiac tamponade pathophysiology (Beck triad, pulsus paradoxus, echocardiography), pericardiocentesis technique (subxiphoid approach), management (NSAIDs + colchicine, COPE trial evidence), complications, special populations (post-cardiac surgery, uremic, malignant, purulent, constrictive vs restrictive)
• Assessment: 4 SAQ practice questions with detailed model answers, 4 Viva scenarios with examiner guidance covering acute pericarditis vs MI, tamponade management, constrictive vs restrictive differentiation, and pericardiocentesis complications