Arteriovenous Access Thrombosis - Endovascular and Surgical Salvage

Key Points

• Loss of thrill or bruit is a classic clue to access thrombosis.
• Most thromboses have an underlying inflow or outflow lesion that must be treated.
• Early salvage improves the chance of preserving the access and avoiding a catheter.
• Endovascular thrombectomy and angioplasty are common first-line strategies.
• Surgical revision is valuable for selected anastomotic, recurrent, or failed endovascular lesions.
• Do not routinely declot an infected prosthetic graft.
• Temporary dialysis catheter placement may be necessary for urgent dialysis but should not end the salvage effort.
• Post-procedure clinical monitoring should focus on recurrent access dysfunction rather than indiscriminate imaging alone.

Algorithm

1. Confirm loss of access function by examination and dialysis history.
2. Assess for infection, skin breakdown, aneurysm, limb ischemia, and urgent dialysis indications.
3. Review access type, age, prior interventions, and likely stenosis location.
4. Obtain duplex or proceed to fistulography based on local access workflow.
5. Perform endovascular thrombectomy plus treatment of the causative stenosis when appropriate.
6. Choose surgical thrombectomy or revision for unsuitable anatomy, recurrent lesions, or failed percutaneous salvage.
7. Avoid salvage of extensively infected graft material; obtain cultures and arrange excision when necessary.
8. Confirm restored access flow and establish follow-up for recurrent clinical dysfunction.

Clinical Synopsis & Reasoning

An acutely thrombosed dialysis access usually presents with loss of the normal continuous thrill and bruit, inability to cannulate, poor dialysis flows, high venous or arterial pressures on prior treatments, or an abrupt reduction in delivered dialysis. Many thromboses are the final event in a preexisting stenosis. In grafts, the venous anastomosis is a common culprit; in fistulas, juxta-anastomotic, cephalic arch, central venous, or other outflow lesions may be responsible. Hypotension, compression, hypercoagulability, inflow disease, or cannulation trauma can contribute.

Examine the entire access and the limb. Confirm absence or marked reduction of thrill, look for erythema, drainage, pseudoaneurysm, skin erosion, edema, and signs of hand ischemia. Infection changes the salvage strategy because declotting an infected prosthetic graft can disseminate bacteremia and may be inappropriate. Duplex ultrasound can confirm thrombus and identify inflow or outflow lesions, although many centers proceed directly to fistulography and intervention when the diagnosis is clear.

Time matters, particularly for fistulas in which organized thrombus becomes increasingly difficult to clear and repeated temporary catheters threaten future access sites. At the same time, an access should not be declotted blindly. A successful thrombectomy without treatment of the causative stenosis has a high early rethrombosis rate. Review prior access imaging, surgical configuration, history of central venous catheters, and repeated lesion sites before deciding between percutaneous and surgical salvage.

Treatment Strategy & Disposition

Coordinate urgently with interventional radiology, vascular surgery, nephrology, or an experienced access center. If dialysis is immediately required because of severe hyperkalemia, pulmonary edema, uremia, or acidosis and the access cannot be salvaged quickly, temporary dialysis catheter placement may be necessary. Catheter placement should preserve future access options and is not a substitute for timely salvage.

Endovascular declotting commonly combines mechanical or pharmacomechanical thrombectomy, aspiration, limited thrombolytic use, and fistulography, followed by angioplasty of the underlying stenosis. Selected recurrent lesions may require stent-graft placement according to access location and guideline indications. Surgical thrombectomy and revision are useful when there is an anastomotic lesion better corrected surgically, large aneurysmal segments, fresh postoperative thrombosis, failed endovascular treatment, or anatomy unsuitable for catheter techniques.

Infected prosthetic graft thrombosis requires a different pathway. Systemic infection, purulence, exposed graft, or extensive graft infection may require partial or complete graft excision with antibiotics rather than declotting. After successful salvage, document a palpable thrill, verify dialysis performance, and create a surveillance plan focused on clinical monitoring and recurrent dysfunction. Routine preemptive intervention on an asymptomatic stenosis detected only by surveillance is not automatically indicated; KDOQI emphasizes clinical indicators of access dysfunction.

Epidemiology / Risk Factors

• Access thrombosis is a major cause of hemodialysis access loss and intervention.
• Prosthetic grafts thrombose more frequently than mature autogenous fistulas.
• Venous outflow stenosis is a common precipitating lesion.
• Recurrent thrombosis often signals an inadequately treated or anatomically difficult lesion.

Investigations

When to Choose Surgery

Pharmacology

Prognosis / Complications

• Promptly salvaged accesses can return to immediate or near-immediate dialysis use.
• Patency is worse when the underlying lesion is recurrent, long, calcified, or centrally located.
• Repeated thrombosis may justify revision or creation of a new access rather than endless declotting.
• Infection and severe central venous disease substantially complicate long-term access survival.

Patient Education / Counseling

• Patients should feel for their access thrill daily if taught to do so and report sudden loss.
• Poor dialysis flows, prolonged bleeding after needles, or new arm swelling can precede thrombosis.
• Protect the access arm from unnecessary venipuncture, blood-pressure cuffs, and compression when feasible.
• Explain why correcting a stenosis is necessary even after clot removal.
• Discuss the access life-plan with nephrology if repeated failures occur.

Notes

KDOQI's patient-centered "ESKD Life-Plan" concept is important in thrombosed access. A technically possible salvage may not be the best choice if the access has repeatedly failed and consumes veins or central venous options needed for future dialysis.

The access should be evaluated as a circuit from arterial inflow through the anastomosis, cannulation segment, venous outflow, and central veins. Focusing only on the visible clot misses the lesion that caused the thrombosis and invites early recurrence.

References

1. KDOQI 2019 Clinical Practice Guideline for Vascular Access — Link
2. National Kidney Foundation Vascular Access Resources — Link