PURPOSE:To determine the success and complication rate of coil embolization of arteriovenous fistulae on in situ saphenous vein bypasses. MATERIALS AND METHOD:82 AV-fistulae on 30 bypasses (28 patients, 20 men, age 62.5 +/- 8.3 years) were treated using coils. The success rate, complications, duration, amount of contrast material and radiation exposure were measured. Color-coded duplex sonography was performed 1 - 2 days and up to 6 - 18 months after embolization. RESULTS:The success rate was 68.3 %. The reasons for persistent fistula perfusion were: 96 % fistula not accessible, 4 % reperfusion during thrombolysis. 7 complications were observed in 6 bypasses: failure of placement and retrieving of coil (n = 4), thrombembolic complications with thrombolysis (n = 3). The duration of intervention was 118.3 +/- 46.6 min, the contrast material need was 277.03 +/- 94.0 ml, and the radiation exposure was 10 966 +/- 11 295 cGy/cm (2). Additional balloon dilatation was performed in 30 % of the bypasses. All bypasses were open 1-2 days after intervention. During follow-up, 11 persistent fistulae were detected. CONCLUSIONS:Coil-embolization of arteriovenous fistulae on saphena magna bypasses proved to be a method with moderate success and complication rates.