16.3 Pericardiocentesis
Key Takeaways
- Tamponade after PCI perforation, after endomyocardial biopsy, or from a malignant effusion is the core indication; hypotension with equalized diastoles and RV collapse is the physiology taught in 6.2.
- Echo- or fluoro-guided needle-to-wire-to-pigtail access uses a subxiphoid or apical window; drain to gravity and send fluid when the tap is diagnostic.
- Agitated saline must swirl in the pericardial space on echo — bubbles in the RV cavity mean you are in the chamber, not the sac.
- Subxiphoid risks liver laceration and RV puncture; apical risks pneumothorax and coronary (often LAD) laceration.
- After PCI perforation: prolonged balloon tamponade, covered stent, protamine as directed, pericardial drain, and sometimes autotransfusion of aspirated blood.
Pericardiocentesis
ARRT Cardiac-Interventional Procedures 2.A.7 is pericardiocentesis. Recognition of tamponade as a crash-cart emergency already lives in 6.2 (hypotension, pulsus paradoxus, equalized diastolic pressures, right-ventricular diastolic collapse). Endomyocardial biopsy as a cause of perforation lives in 10.2. This section is the procedure: how the needle gets into the pericardial space, how you prove you are not in the right ventricle, and what the technologist stages after a coronary perforation. The Focus of Questions still applies: anatomy and pathophysiology, indications, contraindications, imaging, access, ultrasound, equipment, complications, and closure.
Quick Answer: Drain tamponade from post-PCI perforation, post-biopsy bleed, or a malignant effusion. Guide with echo and/or fluoroscopy. Subxiphoid versus apical windows have different organ risks. Sequence is needle → wire → pigtail. Agitated saline must appear in the pericardium, not the RV cavity. Drain to gravity. After PCI perforation: prolonged balloon, covered stent, protamine as directed, and sometimes autotransfusion of aspirated blood.
Anatomy, pathophysiology, indications, contraindications
The pericardial sac is a potential space around the heart. A relatively small acute volume — arterial blood from a coronary Ellis III jet or an RV biopsy bite — raises intrapericardial pressure, impairs diastolic filling, equalizes diastoles, and drops output. A malignant effusion may accumulate slowly and reach a larger volume before the same physiology appears. Either way the treatment of obstructive shock from fluid is drainage, not atropine (that is vasovagal, 6.2) and not a pure vasodilator.
Indications: cardiac tamponade — post-perforation during PCI or structural work, post-endomyocardial biopsy, postoperative or malignant effusion with tamponade physiology, and selected diagnostic taps of unexplained effusion. PEA with organized electrical activity after a distal-wire exit is tamponade until echo says otherwise.
Contraindications are relative when the patient is arresting from tamponade — you drain because the alternative is death. In a stable diagnostic effusion, caution with uncorrectable coagulopathy, aortic dissection with hemopericardium (often a surgical disease), and a very small posterior loculated collection you cannot reach safely from the subxiphoid or apical window. Do not treat a dry pericardium on echo as a reason to “just try a needle.”
Imaging, access, ultrasound
Ultrasound / echo is the access-guidance tool for this procedure. A surface probe finds the largest pocket and the path that stays farthest from liver, lung, and myocardium. ICE already in the right atrium (structural or EP case) can show collapse and the effusion; it does not replace a drainage plan. Fluoroscopy is the classic cath-lab adjunct: a subxiphoid needle aimed toward the left shoulder, often 30–45 degrees, watching the needle tip and, after contrast or wire, confirming an extracardiac loop. Combine echo and fluoro when both are in the room — that is how you avoid guessing.
Access routes (not vascular sheaths):
- Subxiphoid: needle under the xiphoid, aimed at the left shoulder, entering the pericardium over the inferior/right-ventricular surface. Classic cath-lab approach. Liver is on the path if you go too steep or too rightward. RV puncture is the chamber you hit if you go too deep.
- Apical: needle at the echo window near the apex, usually left of midline, where the pocket is largest. Lung (pneumothorax) and the left anterior descending (LAD) or a diagonal are the neighborhood risks. Apical is not a femoral arterial stick and not a jugular stick.
Vascular access for the case (radial or femoral PCI sheaths) stays in place while you drain. Do not pull the coronary balloon that is tamponading a perforation in order to “get better fluoro” for the pericardial needle.
Equipment and the confirmation sequence
Kit teaching: short pericardial needle (or micropuncture), syringe with saline, 0.035-inch J-wire (or the kit wire), dilator, pigtail or dedicated pericardial drain, three-way stopcock, drainage bag to gravity. Crash cart, defibrillation pads, protamine if a heparinized PCI perforation is the cause, a covered stent on the table, and blood-return capability if autotransfusion is planned.
Needle → wire → pigtail (Seldinger). Aspirate as you advance. Serous or frankly bloody fluid may return; in acute perforation the fluid is blood. That does not tell you whether you are in the pericardium or in the RV. Agitated saline (or a tiny contrast puff under fluoro) is the confirmation: on echo, bubbles must swirl in the pericardial space. Bubbles filling a cardiac chamber mean withdraw — you are in the RV (or, worse, LV). A high-pressure arterial flash is not pericardial fluid. Once location is confirmed, pass the wire so it loops freely around the heart on fluoro (a wrap, not a coronary or RV trabecular trap), dilate, and place the pigtail. Drain to gravity or gentle syringe aspiration. Wall suction on a pericardial pigtail can suck myocardium into the holes. Send fluid for cell count, culture, and cytology when the tap is diagnostic (malignancy, infection). An obvious arterial PCI perforation does not need a full malignant-workup panel before you treat the hole, but label whatever you send.
Complications
RV puncture: the needle or wire enters the chamber. Agitated saline in the RV is the diagnosis. Withdraw to the sac if you still have a pocket; if you have lacerated myocardium, surgical backup and continued drainage of the hemopericardium. Liver laceration: subxiphoid path too caudal/right; falling hematocrit, abdominal findings. Pneumothorax: apical (or a high wandering needle); dyspnea, pleural line on fluoro (6.3). Coronary laceration: apical path into the LAD or a diagonal — new ST elevation plus a filling pericardium. Vasovagal responses occur; they are not the same as persistent hypotension from undrained tamponade. Chamber laceration and failed drainage are why a surgeon is notified early in a crashing perforation, not after the third dry stick.
After PCI perforation: the combined plan
Section 15.2 and 14.2 already named the hole treatments. Assemble them here because tamponade from PCI is how 2.A.7 appears in real labs:
- Prolonged balloon tamponade of the perforation (perfusion balloon if available).
- Covered stent when the anatomy allows.
- Reverse heparin with protamine as the operator orders — especially if the vessel is sealed or the bleed is worse than the residual ischemia; this is a physician call, not an automatic push during an unprotected left main still needing flow.
- Pericardiocentesis if the sac is filling; leave a pigtail because reaccumulation is the rule until the hole is closed.
- Autotransfusion of aspirated pericardial blood is used in some labs when the volume is large and the fluid is fresh arterial blood, through a filtered system — it is not a substitute for sealing the coronary and it is not used for chronic exudative fluid.
- Notify surgery / hybrid backup if the bleed will not stop.
Do not give a vasodilator for this blood pressure. Do not pull the drain the moment the first syringe fills if the coronary is still jetting.
| Step | Confirmation | Failure mode |
|---|---|---|
| Choose subxiphoid vs apical window | Echo pocket farthest from liver, lung, and myocardium | Liver laceration (subxiphoid); pneumothorax or LAD injury (apical) |
| Needle entry with aspiration | Fluid return; vital signs | RV or LV chamber entry; dry stick in a loculated posterior sac |
| Agitated saline (or tiny contrast) | Bubbles / contrast in pericardium, not RV cavity | Mistaking chamber blood for success; injecting into RV |
| Wire then pigtail | Wire loops extracardiac on fluoro; pigtail drains | Wire in trabeculae or a coronary; kinking; chamber perforation |
| Drain to gravity; send fluid if diagnostic | Output, echo of residual pocket, hemodynamics improve | Wall suction entraps myocardium; undiagnosed malignant fluid if never sent |
| Post-PCI perforation bundle | Balloon seal, covered stent, protamine as directed, autotransfusion sometimes | Treating tamponade as vasovagal; pulling the drain while the hole still jets |
Closure
When output is low, echo is stable, and the hole is sealed, the pigtail comes out under a planned hold. A simple suture or adhesive at the skin nick is not a vascular closure device, but the groin or radial PCI access still needs the usual closure (13.3). Watch for reaccumulation. Document drain volume, times, protamine, covered-stent lot if used, and the echo findings — this is procedure documentation (4.2), not optional narrative.
Worked case
A distal-wire perforation during RCA PCI drops systolic pressure to the 60s. ICE shows RV diastolic collapse. Someone reaches for atropine. Stop that reflex. Volume, balloon in the hole, echo-guided subxiphoid needle, agitated saline in the sac not the RV, pigtail to gravity. Reverse heparin as the operator orders once a covered stent is ready or the balloon has sealed a distal wire exit. If liters of bright blood return, autotransfusion through a filter may buy time; it does not replace the covered stent. If the needle instead shows bubbles in the RV, you are not in the pericardium — withdraw and re-image before you dilate a chamber.
Exam traps
- Agitated saline in the RV is failure, not confirmation.
- Subxiphoid → liver and RV; apical → lung and coronary.
- Drain to gravity, not wall suction as a default.
- Post-PCI tamponade is balloon + covered stent + protamine as directed + drain, not atropine.
- Recognition hallmarks stay in 6.2; 2.A.7 is the tap itself.
After needle entry for pericardiocentesis, agitated saline is injected. Which finding CONFIRMS the needle is in the pericardial space rather than the right-ventricular cavity?
Comparing subxiphoid and apical pericardiocentesis approaches, which complication pairing is BEST for the R.T.(CI)?
After PCI coronary perforation with tamponade, which combined plan is MOST appropriate?