title: Impact of initial blood flow on outcomes of vascular access in hemodialysis patients.
abstract: BACKGROUND
  Direct access flow measurements are considered the most useful surveillance method for significant stenosis, and ultrasound dilution has become the most popular and validated technique. The goal of this study was to evaluate access flow (Qa) at the time of first cannulation and its relationship to the survival of vascular access in Korean hemodialysis patients.
  
  
  METHODS
  We conducted a prospective observational study from May 2004 to June 2011. We enrolled 60 patients (36 men) who underwent the first access operation between January 2004 and December 2005 and were followed-up for surveillance.
  
  
  RESULTS
  Maturation failure occurred in nine patients (15%). Mean time to first use was 1.8±1.2 months after surgery. The patients were followed-up for a mean of 50.5±25.9 months. There were 25 deaths and six kidney transplants in patients with a functioning access. The total percutaneous transluminal angioplasty incidence was 50 in 27 patients (0.14/access-year). The initial Qa was 757.5±476.4 mL/minute. First cannulation time was not significantly correlated with initial Qa (r=0.234, P=0.075). A total of 22 of the 60 patients (36.7%) had an initial Qa<500 mL/minute. Maturation failure, initial Qa<500 mL/minute, and the use of antiplatelet agents were risk factors for poor primary patency. Diabetic status and use of a graft were risk factors for low cumulative patency.
  
  
  CONCLUSIONS
  An initial Qa<500 mL/minute is a risk factor for poor primary patency, while an initial Qa<500 mL/minute is not a risk factor for low cumulative patency or mortality.
authors.affiliation: Department of Internal Medicine, Soonchunhyang University of Medicine, Bucheon Hospital, Bucheon, Korea.
authors.forename: Soo Jeong
authors.initials: SJ
authors.lastname: Choi
authors.affiliation: Department of Internal Medicine, Soonchunhyang University of Medicine, Bucheon Hospital, Bucheon, Korea.
authors.forename: Moo Yong
authors.initials: MY
authors.lastname: Park
authors.affiliation: Department of Internal Medicine, Soonchunhyang University of Medicine, Bucheon Hospital, Bucheon, Korea.
authors.forename: Jin Kuk
authors.initials: JK
authors.lastname: Kim
authors.affiliation: Department of Internal Medicine, Soonchunhyang University of Medicine, Bucheon Hospital, Bucheon, Korea.
authors.forename: Seung Duk
authors.initials: SD
authors.lastname: Hwang
authors.affiliation: Department of Thoracic and Cardiovascular Surgery, Soonchunhyang University of Medicine, Bucheon Hospital, Bucheon, Korea.
authors.forename: Kyun
authors.initials: K
authors.lastname: Her
authors.affiliation: Department of Thoracic and Cardiovascular Surgery, Soonchunhyang University of Medicine, Bucheon Hospital, Bucheon, Korea.
authors.forename: Yongsoon
authors.initials: Y
authors.lastname: Won
keywords: Arteriovenous fistula; Hemodialysis