💉 Cardiac tamponade is a medical emergency where rising intrapericardial pressure impairs ventricular filling → ↓ stroke volume → ↓ cardiac output → obstructive shock and cardiac arrest 🚨. 👉 Classic Beck’s triad: ↑ JVP, hypotension, muffled heart sounds (often incomplete in practice). 👉 Immediate pericardial decompression is life-saving — do NOT delay for imaging if unstable. 🩺 Point-of-care echocardiography confirms diagnosis (RA/RV diastolic collapse). ⚡ Emergency options: ultrasound-guided pericardiocentesis (first-line) or surgical drainage.

📖 Overview of Pericardial Effusion

💧 Pericardial effusion = fluid accumulation (serous, blood 🩸, pus 🦠, chyle).
⚖️ Normal volume: 10–50 mL
📈 Slow accumulation → pericardium stretches → large volumes tolerated
⚡ Rapid accumulation (even 100–200 mL) → sharp pressure rise → tamponade
🧠 Key concept: rate of accumulation matters more than absolute volume

🩺 Aetiology

🦠 Infective: Viral (commonest), TB (important globally), bacterial
🔥 Autoimmune: SLE, RA, vasculitis
🎗️ Malignancy: Lung, breast, lymphoma, melanoma
💔 Post-cardiac injury: MI (Dressler’s), surgery, trauma
🧪 Metabolic: Uraemia, hypothyroidism
🩸 Vascular: Aortic dissection, free wall rupture post-MI
💊 Iatrogenic: Anticoagulation → haemopericardium

📊 Classification

⏱️ Time: Acute / Subacute (<3 months) / Chronic (>3 months)
📐 Size (echo): Mild (<10 mm), Moderate (10–20 mm), Large (>20 mm)
🫀 Haemodynamic: No compromise / Tamponade / Effusive-constrictive
📍 Distribution: Circumferential vs loculated

⚠️ Causes of Tamponade (High-Yield)

🚑 Trauma or iatrogenic (procedures, pacing wires)
🎗️ Malignancy (common cause of large effusions)
🦠 TB (important in endemic populations)
🩸 Aortic dissection (life-threatening cause)
💔 Post-MI free wall rupture (3–10 days)
💊 Anticoagulation → haemopericardium

👩‍⚕️ Clinical Features (Effusion without Tamponade)

Dyspnoea, fatigue, chest discomfort
Orthopnoea, PND
Systemic features: fever, weight loss (TB/malignancy)
Pressure effects: dysphagia, hoarseness

💡 Pulsus paradoxus = inspiratory drop in SBP >10 mmHg (mechanism: ↑ RV filling → septal shift → ↓ LV filling)

⚠️ Always consider life-threatening differentials: PE, ACS/MI, Type A aortic dissection, tension pneumothorax

🚨 Clinical Features of Cardiac Tamponade

Severe dyspnoea, tachycardia, hypotension → shock
Beck’s triad:
- ↑ JVP
- ↓ BP
- 🔇 Muffled heart sounds
❗ Narrow pulse pressure
❗ Tachycardia almost universal
❗ Absent Y descent (distinguishes from constriction)

🔎 Investigations

ECG: Sinus tachycardia, low voltage, electrical alternans
CXR: “Water bottle” heart (large chronic effusion)
Echo (GOLD STANDARD):
- RA/RV diastolic collapse 🚨
- Dilated non-collapsing IVC
- Swinging heart
Bloods: FBC, CRP, U&E, TFTs, troponin
CT/MRI: For complex/loculated effusions
Pericardial fluid analysis: Cytology, culture, TB PCR

💊 Management (Guideline-Aligned)

🚨 Tamponade = IMMEDIATE DRAINAGE Do NOT delay for definitive diagnosis if unstable.

🅰️ ABC approach + oxygen
💧 IV fluids → temporising (↑ preload)
🩺 Urgent pericardiocentesis (ultrasound-guided) = first-line
🔪 Surgical drainage if traumatic, recurrent, or loculated
❗ Leave drain in situ to prevent re-accumulation

💊 Cause-specific treatment:
- NSAIDs + colchicine → inflammatory pericarditis
- Dialysis → uraemic
- Oncology input → malignant
- Anti-TB therapy → tuberculous

⚠️ Avoid:

❌ Diuretics (↓ preload → worsens tamponade)
❌ Positive pressure ventilation (↓ venous return)
❌ Delays to drainage

🩺 Case 1 — Subacute Effusion

Malignancy-related effusion → gradual symptoms, large volume tolerated. 👉 Drain if symptomatic or haemodynamic compromise.

🩺 Case 2 — Acute Tamponade

Post-surgical patient with shock → echo confirms RA collapse. 👉 Immediate drainage + surgical involvement.

🩺 Case 3 — Anticoagulation-Related

DOAC → haemopericardium → tamponade. 👉 Reverse anticoagulation + urgent drainage.

📚 References

2015 ESC Guidelines for the diagnosis and management of pericardial diseases 👉 Gold-standard guideline for pericardial effusion, tamponade physiology, and management strategies European Society of Cardiology (ESC)
Resuscitation Council UK – Advanced Life Support (ALS) Guidelines 👉 Covers obstructive shock, cardiac arrest, and emergency management principles including tamponade Resuscitation Council UK ALS
NICE Clinical Knowledge Summary (CKS): Pericarditis 👉 UK primary care–focused guidance on causes, investigation, and initial management NICE CKS Pericarditis
NICE Guideline NG158 – Acute coronary syndromes 👉 Relevant for post-MI complications (e.g. free wall rupture → tamponade) NICE NG158
NICE Guideline NG51 – Sepsis 👉 Important differential when patients present with shock and raised inflammatory markers NICE NG51
Oxford Handbook of Clinical Medicine (11th Edition) 👉 Concise bedside summary of tamponade signs (Beck’s triad, pulsus paradoxus) and management
Kumar & Clark’s Clinical Medicine (10th Edition) 👉 Detailed pathophysiology of pericardial disease and haemodynamic compromise
UpToDate – Cardiac tamponade 👉 Comprehensive, regularly updated review of diagnosis and treatment (subscription required) UpToDate

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Pericardial Effusion and Tamponade ✅