Pericardiocentesis

What it is

Pericardiocentesis drains fluid from the pericardial sac through a needle and then a catheter. Its main indication is cardiac tamponade, in which fluid under pressure compresses the heart chambers, limits diastolic filling and lowers cardiac output: the patient is tachycardic and hypotensive, with raised jugular venous pressure, muffled heart sounds (Beck's triad) and pulsus paradoxus, and the ECG may show low voltage and electrical alternans. Echocardiography confirms the effusion and signs of tamponade, such as right atrial and right ventricular diastolic collapse and a dilated inferior vena cava. Tamponade depends on how fast the fluid gathers, not only on how much there is: a small, rapid collection can cause it, and a large, slow one may not. The procedure is done under echocardiographic guidance whenever possible; a blind subxiphoid approach is reserved for arrest or extremis. With the subxiphoid approach, the needle enters between the xiphoid and the left costal margin at a shallow angle, aimed towards the left shoulder; apical and parasternal approaches are chosen when echo shows the fluid closest there. A Seldinger technique leaves a pigtail catheter in place for drainage. Tamponade from aortic dissection, myocardial rupture or trauma is a surgical problem, and needle drainage only bridges to surgery. Fluid is sent for analysis when the cause is unknown.

Indications

• Cardiac tamponade with haemodynamic compromise: emergency drainage.
• Diagnosis of an effusion of unknown cause: suspected purulent, tuberculous or malignant pericarditis.
• Large symptomatic effusion that does not respond to medical treatment.
• Cardiac arrest with pulseless electrical activity thought to be due to tamponade.

Contraindications and precautions

• Tamponade from aortic dissection or myocardial rupture: emergency surgery; needle drainage may worsen bleeding.
• Traumatic haemopericardium: surgical drainage or thoracotomy by an experienced team; a needle only as a bridge.
• Coagulopathy, low platelets or anticoagulants: correct if time allows (relative contraindication).
• Small, posterior or loculated effusions: high risk; consider a surgical window.
• Prefer echo guidance and an experienced operator; blind drainage only in arrest or extremis.

Equipment

• Echocardiography machine with a sterile probe cover, and continuous ECG, pressure and oximetry monitoring.
• Sterile gown, gloves, drape, antiseptic and local anaesthetic with syringes and needles.
• Pericardiocentesis set: long needle with sheath, guidewire, dilator, pigtail catheter and drainage bag with a tap.
• Agitated saline to confirm needle position on echo, and specimen tubes.
• Resuscitation equipment and defibrillator; access to cardiothoracic surgery.

Step by step (and why)

1. Confirm tamponade clinically and on echo; consent if possible; call for help — the decision comes before the needle.
2. Position semi-recumbent at about 30 to 45 degrees — fluid gathers inferiorly and anteriorly, nearer the needle.
3. Use echo to choose the site with the most fluid and the shortest safe path — this avoids the heart, liver and lung.
4. Prepare sterile, infiltrate local anaesthetic along the track — a calm patient helps a precise puncture.
5. Subxiphoid: enter between xiphoid and left costal margin, shallow angle, aiming at the left shoulder — this misses pleura and liver.
6. Advance while aspirating and watching the echo and ECG — ST elevation or ectopy means the needle touches myocardium.
7. Confirm position with agitated saline on echo before passing the guidewire — bubbles in the sac prove the needle is not in a chamber.
8. Pass the guidewire, dilate and insert the pigtail catheter — a catheter drains safely and lets fluid be removed again.
9. Drain gradually, as protocol sets; reassess pressure and echo; send samples — fast drainage of a large effusion can cause decompression syndrome.

Complications

• Puncture of the myocardium or a coronary artery, causing haemopericardium; puncture of a chamber.
• Arrhythmias: ventricular ectopy, ventricular tachycardia, bradycardia from vagal response.
• Pneumothorax and injury to the liver, stomach or colon, and to the internal thoracic vessels.
• Pericardial decompression syndrome after rapid drainage: pulmonary oedema and ventricular dysfunction.
• Infection, catheter blockage and reaccumulation of the effusion.

Next step

• Send fluid as the question requires: cell count, protein, LDH, glucose, Gram stain and culture, tuberculosis tests and cytology.
• Echo and chest X-ray after the procedure to check drainage and exclude pneumothorax.
• Monitor in a high-dependency area; the catheter is usually removed once drainage falls, as local protocol sets.
• Call cardiology or cardiothoracic surgery if blood keeps draining, tamponade recurs or the effusion is loculated.
• Treat and follow up the cause (infection, malignancy, uraemia, autoimmune disease) with repeat echo.

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Elsewhere in DurgiPedia

• Cardiac tamponade: Beck triad and pulsus paradoxus
• Jugular venous pressure and the venous pulse
• Abnormal pulses: paradoxus, alternans, parvus et tardus, bounding
• Informed consent: elements and how to obtain it

Connections

← All clinical skills

Educational content; it does not replace supervised hands-on training, your institution's protocols or a prescriber's order. A procedure is learnt with a teacher and done only once you are trained to do it.

Sources: Pericardiocentesis (StatPearls (NCBI Bookshelf), 2025); Cardiac Tamponade (StatPearls (NCBI Bookshelf), 2026).

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Representative model, for educational purposes only.