Venous · IR Playbook

Retrieval of Intravascular or Pulmonary Artery Foreign Body (IFBR)

Endovascular foreign-body retrieval is fluoroscopic removal of an embolized or retained catheter fragment, guidewire, coil, stent, sheath or other device from the vascular system or pulmonary arteries. Percutaneous retrieval is preferred when feasible because heterogeneous series report technical success of approximately 80–97%, usually avoiding open surgery. Major hazards are further migration, arrhythmia, valvular injury and vascular or cardiac perforation, particularly during right-heart or pulmonary-artery manipulation.

Learning objectives

Select the safest access and extraction direction from the object's location and orientation.
Use a loop snare for a free end and create a free end when both ends are inaccessible.
Recognize when traction should stop and surgical or hybrid retrieval is safer.

Indications

Embolized or fractured central venous catheter, port catheter, PICC or dialysis-catheter fragment.
Retained or migrated guidewire, sheath, balloon, coil, stent, filter component or other intravascular device when removal is technically feasible.
Mobile or symptomatic foreign body causing or threatening arrhythmia, infection, thrombosis, obstruction, embolization, perforation or valvular injury.
Foreign body within the SVC, IVC, right atrium, right ventricle or pulmonary arterial tree for which percutaneous removal is safer than observation or surgery.
Selected chronic asymptomatic foreign body after multidisciplinary assessment shows that retrieval risk is lower than retention risk.

Relative contraindications

Chronic, firmly endothelialized or calcified foreign body whose traction may tear the vessel or myocardium.
Object penetrating the vessel or cardiac wall, entangled in a valve or associated with perforation requiring operative repair.
Large, rigid or sharp foreign body without a safe sheath-protected extraction route.
Uncorrectable coagulopathy or inability to obtain safe vascular access.
Hemodynamic instability requiring immediate surgical exploration rather than prolonged percutaneous manipulation.

Equipment

Ultrasound-guided vascular access set with 21 G needle, 0.018-inch wire and 4–5 Fr micropuncture sheath.
6–12 Fr short or long introducer or retrieval sheath with hemostatic valve; larger sheath selected when the folded object requires it.
4–6 Fr pigtail, multipurpose, vertebral or Cobra catheter for localization, alignment and creation of a free end.
0.035-inch hydrophilic guidewire and supportive exchange-length guidewire.
Nitinol loop snare set, commonly 5–35 mm, with compatible delivery catheter.
Dormia basket, endovascular grasping forceps or biopsy forceps as selected bailout devices.
Low-profile angioplasty balloon sized to the lumen of a tubular foreign body for intraluminal balloon trapping.
Second vascular access set and second snare for dual-access or dual-snare control.
Fluoroscopy, iodinated contrast, continuous ECG and blood-pressure monitoring, defibrillator and resuscitation equipment.
For high-risk cardiac or pulmonary-artery cases, immediate access to pericardiocentesis, balloon occlusion, embolization and surgical rescue equipment.

Procedure steps

Obtain immediate preprocedural imaging to confirm that the foreign body has not migrated. Choose the access, snare loop and sheath from its position, free end, rigidity and expected folded profile; define a surgical rescue plan before high-risk retrieval.Pearl: Plan the extraction direction before touching the object.
Puncture the selected vein or artery under ultrasound guidance and insert an appropriately sized sheath. For right-heart or pulmonary-artery retrieval, maintain continuous ECG and hemodynamic monitoring.
Use fluoroscopy in two projections and limited angiography when needed to define the object and surrounding vessel. Advance a long sheath or guide catheter close to the target without displacing it.Pearl: A coaxial catheter position makes snaring easier and reduces lateral traction.
Open the loop beyond or around an accessible end, capture it under orthogonal fluoroscopy and close the snare securely. Grasp near an end rather than the middle so that a long object trails and can enter the sheath.Pearl: The loop snare is the first-line device when a free end is available.
If both ends are inaccessible, hook the object with a pigtail catheter and pull it into a roomy vessel, preferably with the pigtail already passed through an open snare. Alternatives include a guidewire loop, basket, intraluminal balloon or carefully selected forceps.Pearl: The pigtail-through-snare method reduces the chance of losing the newly created free end.
Maintain controlled tension and draw the captured object into the sheath or guide catheter under fluoroscopy. If one device does not control orientation, use a second snare or second access; do not pull an exposed sharp or rigid object through the heart or vessel.Pearl: Whenever possible, completely sheath the object before crossing valves or removing it through the access tract.
Remove the sheath-device assembly as required and compare the retrieved object with the expected original length and components. Obtain specimen culture when infection is suspected.
Use fluoroscopy, radiography or angiography to exclude a retained fragment, distal migration, dissection, thrombosis or extravasation. Obtain echocardiography when there was intracardiac resistance, arrhythmia, suspected valvular injury or concern for pericardial effusion.
Remove the access sheath when appropriate and obtain hemostasis by compression or a selected closure method. Transfer for monitored recovery, extending observation after intracardiac or pulmonary-artery manipulation.

Complications

Transient arrhythmia
Access-site bleeding or hematoma
Loss of capture, fragmentation or distal embolization
Vascular or cardiac perforation, tamponade or pulmonary hemorrhage
Tricuspid or pulmonary-valve injury
Vascular thrombosis or thromboembolism
Bacteremia or sepsis from infected material

Exam pearls

Loop snare is first-line when a free end is available.
No free end: create one with a pigtail; the pigtail-through-snare technique may simplify immediate capture.
Choose access for coaxial alignment, not by habit.
Capture a long object near one end so it trails into the sheath.
Never force a captured object that will not enter the sheath; upsize, regrip, use dual control or convert to surgery.
Pulmonary-artery traction can cause perforation and life-threatening hemoptysis.

Viva questions

What is the first-line device for intravascular foreign-body retrieval?: A **loop snare** is first-line when an accessible free end is present because it is flexible, controllable and can draw the captured object into a sheath.
What is the preferred access for a catheter fragment in the right heart or pulmonary artery?: The right common femoral vein is commonly used because it provides a broad inferior approach. Internal jugular access may be better when it gives more coaxial alignment, so access is chosen from the object's position and orientation.
How do you retrieve a catheter fragment when neither end is free?: Use a pigtail catheter to hook and disengage an end in a roomy vessel, then snare it. Passing the pigtail through an already open snare, the pigtail-through-snare technique, reduces loss of the newly created free end.
Why should a long foreign body be snared near one end?: End capture lets the object trail into the sheath. Midpoint capture doubles its profile, impedes sheath entry and increases vessel or valve trauma.
When should you abandon percutaneous retrieval?: Stop when there is firm resistance suggesting endothelialization or entanglement, an unsafe sharp or rigid extraction path, perforation, uncontrolled migration or inability to contain the object in a sheath. Surgical or hybrid retrieval is then safer.
What is the key rule during pulmonary-artery foreign-body retrieval?: Use atraumatic, coaxial manipulation and avoid force in distal branches. The pulmonary artery is thin-walled, and perforation may present with massive hemoptysis and hemodynamic collapse.