Complication of AV Fistula

About Complication of AV Fistula

An AV fistula is the longest-lasting form of dialysis access, but it can develop problems over time. The success of the original surgery depends heavily on the condition of the chosen artery and recipient vein. Many patients have undergone multiple cannulations of forearm veins for antibiotics or transfusions, leaving the vessel walls scarred and less elastic. In such cases, the resulting fistula may not develop the flow needed for effective haemodialysis.

When AV fistula surgery fails, options include observation, vascular interventions, and a fresh attempt at fistula creation at another site. As specialists in av fistula repair surgery, we evaluate the patient with clinical examination and duplex ultrasound, and sometimes additional imaging, before recommending the most appropriate strategy. The aim is always to preserve as many future access sites as possible, since dialysis may be needed for years.

Infection is another important concern in dialysis access complications. Infected fistulas may show redness, pain, discharge, or systemic signs such as fever. They are sometimes associated with aneurysmal swelling of the vessel wall or surrounding haematoma. Treatment usually starts with antibiotics chosen on the basis of cultures; in active or severe infection, the fistula may need to be ligated to control sepsis, with alternative access planned in parallel.

Aneurysmal dilation can occur after years of repeated cannulation. A true aneurysm involves weakening of the entire vessel wall, while a false aneurysm or pseudoaneurysm is a contained haematoma outside the vessel, communicating with the artery through a small leak. Distinguishing the two with examination and Doppler imaging guides appropriate vascular surgery for fistula problems, ranging from observation to surgical repair or revision under controlled conditions.

What to expect

• Detailed clinical examination of the access arm with review of dialysis records and prior imaging.
• Duplex ultrasound and, where needed, further imaging to characterise flow, infection, or aneurysm.
• Treatment may involve antibiotics, percutaneous intervention, surgical revision, or new fistula creation.
• Surgery is usually performed under local or regional anaesthesia as a planned procedure.
• Coordinated follow-up with the nephrology and dialysis team protects ongoing access.

Recovery

• Wound care, dressing changes, and careful monitoring for re-infection are essential.
• Avoid pressure or tight clothing over the affected arm during healing.
• Dialysis schedules may need adjustment around the procedure and recovery period.
• Report sudden bleeding, severe pain, fever, or loss of thrill immediately to the team.