目的研究彩色多普勒超声在早期诊断动静脉内瘘功能不良的临床价值。方法对68 例临床怀疑动静脉内瘘功能不良的患者进行相关血管超声检查，测量瘘口血管内径和瘘口与上游动脉的峰值血流速度，计算两者比值。结果发现61 例自体动静脉内瘘狭窄，血流速度比值I≥2.5；其余7 例患者未见明显狭窄，血流速度比值＜2.5。结论彩色多普勒超声检查是临床早期诊断动静脉内瘘功能不良的有效手段。

Objective To study the clinical value of color Doppler ultrasonography in the early diagnosis of arteriovenous fistula stenosis. Methods Color Doppler ultrasonography was performed in 68 patients clinically considered to have arteriovenous fistula stenosis. We record the peak systolic velocity in the fistula and its upstream artery and calculated the blood flow velocity ratio. Results We found fistula stenosis and the blood flow velocity ratio ≥ 2.5 in 61 cases; the remaining 7 cases were negative, i.e., their blood flow velocity ratio ＜2.5. Conclusion Color Doppler ultrasonoggraphy is an effective method for the early diagnosis of arteriovenous fistula stenosis in clinical practice.