Abstract: Purpose To investigate the clinical effect of narrowing operation on the patients with tumorlike dilatation of arteriovenous fistula (AVF). Methods Patients with tumor-like dilatation of AVF from Jan. 2010 to May 2015 were included in this study. We summarized their clinical characteristics, surgical methods,
indication of the surgical intervention, and technical indication of the surgical intervention. After narrowing operation, clinical symptoms of the patients were also observed. Results Thirty patients were included in this study. Tumor-like dilatation of AVF occurred for more than one year in all of the 30 cases. Dilated AVFs located near the puncture sites. The successful rate of this operation was 100%. Three patients were unsuitable for this operation and were treated with ligation. Among the 3 patients, the AVF was reconstructed using basilica vein in one patient, the AVF was changed to another limb in one patient, and a polyester cuffed catheter was indwelled in the fistula in one patient. Clinical symptoms improved significantly in the follow-up period of 3- 6 months. The diameter of AVFs reduced from 43.075±1.332 mm to 28.604±3.406 mm (P=0.001). Blood flow velocity measured by color Doppler ultrasound decreased by 60%～70% (from 1987.0 ± 53.73 ml/min to 791.10±28.12 ml/min, P<0.01). Reconstructed AVFs were used for blood access again after 4～8 weeks of operation. Conclusions The narrowing operation is an effective intervention for the tumor- like dilatation of AVF.

Key words: constriction, Hemodialysis, Arteriovenous fistula, Tumor-like dilatation