Ilyas K. Colombowala, MD, FACC, FHRS
Cardiac Electrophysiology · Houston, TX · colombowala.com
EP Staff Education

Emergency

Pericardiocentesis

Bedside drainage of pericardial fluid for tamponade physiology — the EP lab's most time-critical procedure. ICE guidance preferred; subxiphoid approach with a Tuohy or pericardial needle, confirm with contrast or echo, leave a drain.

Indications

  • ▸Acute tamponade physiology during or after an EP procedure — hypotension, jugular distension, pulsus paradoxus, falling cardiac output
  • ▸ICE or fluoroscopic evidence of significant pericardial effusion with hemodynamic compromise
  • ▸Symptomatic effusion not responding to fluid resuscitation

Equipment / drugs

  • ▸Pericardiocentesis tray: 18-gauge Tuohy needle (preferred) or 18-gauge spinal needle, syringe, three-way stopcock
  • ▸Drainage catheter: 6–8 Fr pigtail with stiffening guidewire (modified Seldinger)
  • ▸Sterile drape, prep, local anesthetic (lidocaine 1%)
  • ▸Echo (ICE if already in the lab, or TTE/TEE) for guidance and confirmation
  • ▸Contrast (10 mL saline-air agitated or radiographic) to confirm pericardial position before catheter placement
  • ▸Closed drainage bag connected to the catheter post-placement

Pitfalls

  • ▸Right-ventricular puncture — always confirm needle position with contrast or echo before dilating; aspiration of pulsatile bright-red blood is RV until proven otherwise
  • ▸Subxiphoid 'angle too steep' — needle aims toward the left shoulder, 15–30° below the costal margin
  • ▸Failure to advance the catheter over the wire (kinking) — use a stiff exchange wire and gentle catheter advancement
  • ▸Re-accumulation — leave the drain in for at least 24 hours, monitor output
  • ▸Forgetting to send fluid for studies if the etiology is unclear (cytology, culture, gram stain, BNP, hematocrit)

Recognize tamponade first

Pericardiocentesis is treatment; tamponade recognition is the upstream skill. In the EP lab, tamponade is almost always a procedural complication — transseptal puncture, RV perforation from a stiff sheath or catheter, LV perforation during VT ablation, atrial perforation during AF ablation. The clinical picture progresses rapidly:

  • Sudden hypotension that doesn’t respond to a fluid bolus
  • Sinus tachycardia (paradoxical bradycardia is a pre-arrest finding — bad)
  • Pulsus paradoxus when measurable
  • Rising central venous pressure / JVD
  • Falling LV stroke volume on ICE
  • Effusion visible on ICE — often anteriorly displacing the RV, with diastolic collapse

If any of this is happening — stop the case, hold anticoagulation if you haven’t, call for help, prepare for pericardiocentesis.

Setup

  • Patient: supine, head slightly elevated 15° if hemodynamics allow
  • Approach: subxiphoid is standard; apical or parasternal are alternatives for posterior or loculated collections
  • Guidance: ICE is fastest if already placed (look at the apical 4-chamber view, identify the effusion, plan the needle path). Otherwise, surface echo (preferably TTE) — TEE if the patient is intubated and the operator is comfortable
  • Anesthesia: local with lidocaine 1% at the entry site; the case is often already sedated or under GA
  • Anticoagulation reversal in parallel: do not wait for the drain to start reversal — reverse and drain together

Subxiphoid technique

  1. Site: 1 cm below the xiphoid process, slightly left of midline
  2. Needle: 18-gauge Tuohy preferred (curved tip reduces RV-puncture risk vs straight); spinal needle acceptable
  3. Trajectory: aim toward the left shoulder, 15–30° below the costal margin, advancing slowly with continuous gentle suction on the syringe
  4. First fluid return: aspirate slowly. Test the fluid:
    • Straw-colored / sero-sanguinous — pericardial; proceed
    • Bright red, pulsatile — RV until proven otherwise; stop, do not dilate, confirm position before any next step
  5. Confirm position before placing the catheter:
    • Inject 5–10 mL agitated saline through the needle while watching ICE/echo — bubbles should appear in the pericardial space, NOT in the RV cavity
    • Or inject 5–10 mL radiographic contrast under fluoro — should layer in the pericardial space, not flow with the RV
  6. Exchange for catheter:
    • Pass a 0.035” stiff guidewire through the needle into the pericardial space
    • Confirm wire position on fluoro (should curl around the heart silhouette, not into the PA or RV)
    • Remove needle, dilate, advance pigtail catheter (or whichever drain) over the wire
    • Aspirate to confirm; secure the catheter

After the drain is in

  • Initial drainage can be dramatic — 200–500 mL in the first minute is not unusual. Hemodynamics typically improve within seconds
  • Send fluid for studies if etiology is unclear: cytology, culture, gram stain, hematocrit (compare to peripheral), BNP if considering cardiac source
  • Leave the drain. Connect to a closed drainage bag, allow to drain by gravity. Re-aspirate every 2–4 hours initially, then per output
  • Echo at 6–12 hours to assess for re-accumulation; remove drain when 24-hour output is minimal and effusion is stable
  • Anticoagulation plan: hold any further heparin; the next anticoagulant dose decision depends on the procedure stage and ongoing bleeding risk

Post-procedure thinking

After successful drainage and hemodynamic recovery, the bigger question is what comes next:

  • Did the bleeding stop? Output should taper. Persistent bright-red drainage > 100 mL/hour after the initial decompression suggests ongoing bleeding and is a surgical conversation
  • Can the EP procedure continue? Almost always no for that visit. The case is typically aborted, the patient is observed, and the procedure is rescheduled
  • Surgical consultation? Threshold for cardiothoracic surgery consultation is low — they should at minimum be aware. Surgical intervention is needed when bleeding doesn’t stop, when there’s evidence of perforation that won’t close, or when drainage isn’t adequately controlling tamponade

When pericardiocentesis isn’t the answer

A few situations where a drain alone is the wrong move:

  • Aortic dissection causing hemopericardium — decompression can worsen rupture; this is a surgical emergency, not a pericardiocentesis
  • Type B aortic injury with pericardial extension — same principle
  • Loculated effusion that the subxiphoid needle can’t safely reach — apical or parasternal approach, or surgical window
  • Pre-arrest patient already without pulses — pericardiocentesis can still help bridge to ROSC during CPR; do it in parallel with chest compressions

These are uncommon in the EP lab but the team should know that pericardiocentesis is not always the answer in every hypotensive patient with an effusion.

Last reviewed by Dr. Colombowala on May 24, 2026.

Clinical-reference content, not medical advice. This page is written for EP staff and does not create a doctor-patient relationship. It does not replace institutional policy, current device manuals, or attending direction during a case. See the full disclaimer.

© 2026 Ilyas K. Colombowala, MD. All rights reserved. Reproduction, redistribution, or republication of this content in any form without written permission is prohibited.

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