Abstract: 【Abstract】Objective To evaluate the secondary patency and outcomes of arteriovenous graft (AVG) when stricter stenosis intervention threshold and surveillance by Doppler ultrasound were used. Method A total of 26 patients with AVG and monitored by Doppler ultrasound between June 2011 and July 2016 were enrolled in this study. They were divided into two groups, conventional intervention group (group A, n=12) and stricter stenosis intervention threshold group (group B, n=14). The intervention indication in group B was stricter than that in group A. AVG secondary patency, thrombosis event, intervention frequency per year, and AVG access outcome were compared between the two groups. Results Clinical characteristics, AVG outcomes and thrombosis events were similar between the two groups. However, intervention frequency per year was lower in group B than group A (0.54±0.34 vs. 0.94±0.42, t=2.720, P=0.017). Meanwhile, the secondary patency was similar between the two groups (P=0.941). The secondary patency rates after 12 months, 24months and 36 months were 100% vs. 100%, 68.2±15.4% vs. 78.6±11.0%, and 51.1±18.7% vs. 61.1±13.8% (log rank test, χ2=0.007, P=0.941) in group A and group B, respectively. Conclusions Under ultrasound surveillance, stricter stenosis intervention threshold gets similar AVG secondary patency and reduces intervention frequency per year.

Key words: Arteriovenous Graft, Hemodialysis, Borderline Stenosis, Significant Stenosis, Secondary Patency, Thrombosis, Doppler Ultrasound