Pericardial Effusion and Pericarditis in Children
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Direct answer
Pericardial effusion is fluid in the pericardial sac, and tuberculosis is a major cause of it in India. Tamponade occurs when the fluid impairs ventricular filling, and it is recognised by hypotension, muffled heart sounds and raised venous pressure, the Beck triad. Echocardiography confirms the diagnosis, and pericardiocentesis is the immediate treatment for tamponade.
What you must remember
- Infective causes: viral agents such as coxsackievirus and adenovirus, purulent bacterial infection with Staphylococcus aureus or pneumococcus, and tuberculosis.
- Non-infective causes: uraemia, malignancy, systemic lupus, rheumatic fever, post-cardiac surgery syndrome and hypothyroidism.
- Beck triad: hypotension, muffled heart sounds and raised jugular venous pressure, which signal tamponade.
- Electrical alternans: beat-to-beat alternation of QRS amplitude, a classic ECG sign of tamponade, with low QRS voltage often present.
- Pericardiocentesis: drainage under echocardiographic guidance, often by a subxiphoid approach, with fluid sent for culture, cytology and biochemistry.
- Purulent pericarditis: needs urgent drainage and intravenous antibiotics, with a surgical window if fluid recurs.
- Pericarditis pattern: pleuritic chest pain relieved by sitting forward, a friction rub, and diffuse ST elevation with PR depression.
From suspicion to drainage
A child with a pericardial effusion may look stable until the fluid compromises ventricular filling. The steps below set out a practical sequence from recognition to drainage.
- Suspect tamponade: tachycardia, hypotension, cold extremities and rising work of breathing point to impaired output.
- Confirm on echo: right atrial and right ventricular chamber collapse shows haemodynamic compromise, and it is the key echo sign to look for.
- Support the ECG: electrical alternans and low voltage strengthen the diagnosis.
- Stabilise: cautious fluid and vasopressor support are given while drainage is prepared. Heart rate, blood pressure and urine output are charted throughout.
- Drain: pericardiocentesis is performed under echo guidance, and the fluid is sent for tests. Fluid analysis guides whether antibiotics or antituberculous therapy is started.
- Definitive treatment: a pericardial window or drain is considered for recurrence or for purulent or tuberculous effusion. Recurrence after simple drainage is a reason to consider a window.
Where the exam tries to catch you
Pericardial questions test the cause and the emergency. Watch for these traps.
- Trap: Calling a large effusion in a febrile child simply viral. Correct: Tuberculosis is a major cause in India, so fluid should be sent for AFB, adenosine deaminase and cytology before treatment is decided.
- Trap: Relying on pulsus paradoxus alone in an agitated child. Correct: Pulsus paradoxus can be unreliable in children, so echocardiographic chamber collapse and the Beck triad guide the diagnosis.
- Trap: Treating every pericarditis with steroids. Correct: Idiopathic and viral pericarditis respond to NSAIDs with colchicine, while steroids are reserved for specific causes such as lupus or selected tuberculous cases.
Frequently asked questions
Which causes of pericardial effusion matter most in India?
Tuberculosis is a major cause of pericardial effusion in India and is typically exudative with high protein. Other important causes include viral infection, rheumatic fever and uraemia, while purulent effusion from bacterial spread needs urgent drainage.
What is the Beck triad and what does it signal?
The Beck triad consists of hypotension, muffled heart sounds and raised jugular venous pressure, and it signals cardiac tamponade. It is an important clinical clue, but echocardiographic chamber collapse is needed to confirm the diagnosis.
Which ECG finding suggests tamponade?
Electrical alternans, the beat-to-beat alternation of QRS amplitude as the heart swings within the effusion, is the classic ECG sign of cardiac tamponade. Low QRS voltage and sinus tachycardia are also common in a child with a large effusion.
How is pericardiocentesis performed in children?
Pericardiocentesis is performed under echocardiographic guidance, often by a subxiphoid approach, and the fluid is sent for culture, cytology and biochemical tests. Drainage relieves tamponade quickly, while a pericardial window is preferred when fluid recurs or pus is present.