Patients with kidney failure that is end-stage or is approaching end-stage. End-stage kidney failure is when the kidneys have deteriorated to the extent that their inability to remove toxins and excess water from the bloodstream becomes a threat to life.
Patients who are approaching end-stage kidney failure should consider having a vascular access such as an Arteriovenous Fistula created even before they reach end-stage. This is because the vascular access takes some time before it can be used, and it is preferable to have one ready for use when the time to start dialysis comes.
The patient will be examined carefully. An ultrasound scan will be performed to assess the quality of the arteries and the veins in the patient’s arms.
The AVF is created under local anaesthesia. This is done as Day Surgery. The procedure normally takes about 45 minutes, and patients are ready to go home shortly after surgery. Most patients do not feel any pain during the procedure. Even post-operative pain is minimal, with most patients taking pain-killers only for 1 day.
The Arteriovenous Graft (AVG) usually requires regional anaesthesia. This is where a local anaesthetic is injected under the collar bone to block the sensory nerves supplying the arm and forearm. Once the arm and forearm are numb, the surgery is carried out. AVG placement normally takes about 2 hours. There is usually some swelling around the graft after surgery which takes about 2 weeks to settle.
The main problems with accesses is that they do not last forever. AVFs have a longer average lifespan compared to AVGs. The main cause of failure of these accesses is narrowing, or stenoses, within the lumen of the access. The narrowing is caused by scarring of the inner lining of the access.
Fortunately if diagnosed early, these stenoses can be treated with angioplasty, which is a procedure where a balloon is inserted through the stenosis. The balloon is inflated stretching the stenosis open hence re-establishing smooth and brisk blood flow.
Exercise the limb with the access regularly.
Avoid direct trauma to the access
Undergo flow monitoring. Flow monitoring is where the rate of blood flowing through the access is measured. A narrowing (stenosis) in the access would slow the flow. If monitored regularly, we would know a stenosis is developing when we notice the flow rate starting to drop. Patients with a drop in their flow rate are referred for angioplasty of their vascular access. Flow monitoring should be performed every two months.
Consultant Vascular & General Surgeon
MBBS (Singapore), MMed (Singapore), FRCS (Edinburgh)
An experienced vascular and general surgeon in Singapore, Dr Sujit Singh Gill’s main interests include the minimally invasive treatment of venous, arterial and diabetes-related vascular disorders. His expertise in general surgery also allows him to treat various colorectal, gastrointestinal and hepatobiliary conditions with good patient outcomes. Having trained in Singapore, Australia and the United Kingdom, Dr Sujit Singh Gill’s diverse background also helps put his patients at ease.Read More