Purpose: To report our 13 years of experience with the 'primary extension technique' for the prevention of dialysis-associated steal syndrome.
Methods: All diabetic patients undergoing upper arm autogenous elbow fistula formation using the primary extension technique between September 2001 and September 2014 at a single centre were included. At follow-up all patients were evaluated for patency, adequacy of needling and the presence or absence of steal symptoms. In primary extension technique, the fistula is formed by anastomosing the median cubital vein with the proximal radial or ulnar artery just below the brachial artery bifurcation.
Results: In total, 64 operations of the primary extension technique were included in this study. All patients were diabetic. Primary failure was 5%, follow-up 23-84 months. Nine patients (14%) developed cephalic vein thrombosis. In these cases, the basilic vein was successfully transposed to the existing fistula. In eight patients (12.5%), the cephalic vein required superficialisation. In three patients, the flow was preferentially into the basilic vein with poor maturation of cephalic vein. Of these three patients, there was a small proximal cephalic vein in one patient and stenosis in the other two patients. One patient who developed dialysis-associated steal syndrome is included in the results as they were listed for primary extension technique fistula formation but in fact did not have their fistula formed using primary extension technique. Instead, the anastomosis was formed proximal to the bifurcation of the brachial artery. Symptoms improved with revision of the fistula.
Conclusion: Our 13-year experience demonstrates that the primary extension technique is a safe and effective procedure for fistula formation. Patency rates are comparable to brachio-cephalic and brachio-basilic fistulas and primary extension technique is effective in the prevention of dialysis-associated steal syndrome.
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