Abstract: Objective To explore the correlation between brachial artery blood flow velocity measured by color Doppler flow imaging (CDFI) and maturation of autologous arteriovenous fistula (AVF).Methods Clinical data of 141 patients who underwent end to side cephalic radial anastomosis was collected from December 2015 to August 2018 in our hospital.A comparative study of CDFI results before and after AVF was performed.Results Among 141 patients,116 AVF cases achieved maturation successfully（mature group）and 25 cases did not achieve maturation（immature group）.The prevalence of diabetes mellitus and the proportion of diabetic nephropathy as primary diseases in immature group were higher than those in mature group(P＜0.05).The diameter of cephalic vein in mature group was higher than that in immature group before operation.At 8 weeks after operation,the diameter of fistula anastomosis,diameter of brachial artery,max blood flow velocity of brachial artery and flow velocity change of brachial artery in mature group ware all higher than those in immature group(P＜0.05).Conclusion The diameter of brachial artery,max blood flow velocity of brachial artery and flow velocity change of brachial artery are measured early after operation can forecast the maturity of internal fistula and find the immature internal fistula early.

Key words: Arteriovenous fistula, Internal fistula maturity, Blood velocity of brachial artery, Color Doppler flow imaging