“When I tell a patient they need a fistulogram, the most common response is fear. But once I explain it, they’re relieved. It’s often the same sitting where we fix the problem entirely.”
Written by Dr Rahul Agarwal, Consultant Vascular & Endovascular Surgeon
CARE Hospitals, Banjara Hills, Hyderabad
🦥 What Is a Fistulogram?
A fistulogram is a radiological procedure in which contrast dye is injected into the AV fistula under X-ray guidance (fluoroscopy) to visualise the entire access — from the feeding artery through the anastomosis, along the fistula vein, and into the central veins. It shows precisely where any narrowing, clot, or abnormality is located, and in most cases allows the problem to be treated at the same sitting.
📍 When Is a Fistulogram Needed?
- Fistula thrill has disappeared or become significantly weaker
- Fistula is not maturing after 8–12 weeks
- Dialysis adequacy (Kt/V) is falling without explanation
- Arm swelling has developed on the fistula side
- Dynamic venous pressures are elevated on two consecutive dialysis sessions
- Recurrent fistula clotting
🏥 What to Expect: Step by Step
Before the Procedure
No general anaesthesia is needed. You will be awake. The procedure is done in a catheterisation lab or fluoroscopy suite. Inform your team if you have any contrast dye allergy or kidney function concerns.
During the Procedure
The fistula arm is cleaned and a small needle is inserted into the fistula under local anaesthesia. Contrast dye is injected and real-time X-ray images are taken. You may feel a warm sensation as the dye is injected — this is normal. The images clearly show any stenosis (narrowing), aneurysm, thrombosis, or accessory vein.
Treatment at the Same Sitting
If a stenosis is found, a balloon catheter is advanced to the narrowed area and inflated — this is called fistuloplasty (percutaneous transluminal angioplasty or PTA). The balloon stretches the narrowed segment open. If the stenosis is resistant or recurs rapidly, a metallic stent may be placed. This is all done through the same needle puncture, without a surgical incision.
After the Procedure
Pressure is held on the puncture site for a few minutes after the procedure. Most patients go home the same day or return to dialysis within hours. The fistula is usually immediately palpable with a stronger thrill than before.
🙋🏻♂️ Frequently Asked Questions
Is a fistulogram painful?
The needle insertion is done under local anaesthetic and is no more uncomfortable than a standard blood test. The dye injection creates a warm or flushing sensation. Balloon inflation can create a brief ache in the arm. Overall, the procedure is well-tolerated by the vast majority of patients.
Is contrast dye safe for someone with kidney failure?
Since dialysis patients have no remaining kidney function to protect, contrast nephropathy is not a concern — the kidneys cannot be further damaged by dye in a patient already on dialysis. Your vascular surgeon will inform the team that standard contrast can be used safely.
How often might I need a fistulogram?
Some fistulas function for decades without ever needing one. Others with recurrent stenosis may need angioplasty every 6–12 months. The goal is always to identify and treat problems early enough to avoid fistula loss — a prophylactic fistulogram is far better than an emergency thrombectomy.
🔑 Key Insights
A fistulogram is both a diagnostic test and often a treatment in a single procedure. It is safe, same-day, and in most cases immediately restores your fistula to full function.
📖 Related Reading:
- My AV Fistula Thrill Has Gone — What Does It Mean?
- AV Fistula Not Maturing: Why It Happens and What Can Be Done
- Dialysis Access & AV Fistula Surgery in Hyderabad
🧑🏻⚕️ About the Author
Dr Rahul Agarwal is a Consultant Vascular & Endovascular Surgeon at CARE Hospitals, Banjara Hills, Hyderabad, specializing in AV Fistula surgery, dialysis access, peripheral artery disease, varicose veins, and limb salvage.
Medical Disclaimer: This article is for patient education only and does not replace consultation with your vascular surgeon regarding your specific fistula needs.