title: Timing of preemptive vascular access placement: do we understand the natural history of advanced CKD?: an observational study.
abstract: BACKGROUND
  Little is known about the targets and expectations of practicing nephrologists with regard to timing of preemptive AV access surgery and how these relate to actual observed practice patterns in clinical care.
  
  
  METHODS
  We administered a 8-question survey to assess nephrologists' expectations for preemptive vascular access placement to 53 practicing nephrologists in California. We performed a retrospective chart review of 116 patients who underwent preemptive vascular access placement at a large academic medical center and examined progression to ESRD.
  
  
  RESULTS
  According to our survey of nephrologists, most aimed to have preemptive vascular access created about 6 months prior to start of ESRD or when the chances of ESRD within the next year is two-thirds or greater. The estimated GFR level at which they believe match these conditions is approximately 18 ml/min/1.73 m2. Among the 116 patients with CKD who underwent preemptive vascular access creation, the mean estimated GFR at the time of access creation was 16.1 (6.8) ml/min/1.73 m2. Only 57 out of the 116 patients (49.1%) patients initiated maintenance HD within 1 year after surgery.
  
  
  CONCLUSIONS
  In our study, most nephrologists aim for preemptive vascular access surgery approximately 6 months prior to the start of HD. However in fact, only approximately 50% of patients who underwent preemptive vascular access surgery started HD within 1 year. Better tools are needed to predict the natural history of advanced CKD.
authors.forename: Nisha
authors.initials: N
authors.lastname: Bansal
authors.forename: Chenyin
authors.initials: C
authors.lastname: He
authors.forename: Daniel P
authors.initials: DP
authors.lastname: Murphy
authors.forename: Kirsten L
authors.initials: KL
authors.lastname: Johansen
authors.forename: Chi-yuan
authors.initials: CY
authors.lastname: Hsu
mesh_terms: D000368:Aged; D001166:Arteriovenous Shunt, Surgical / Q000379:methods*; D003625:Data Collection / Q000379:methods; D018450:Disease Progression; D005260:Female; D006801:Humans; D007676:Kidney Failure, Chronic / Q000175:diagnosis* / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D010819:Physician's Role; D006435:Renal Dialysis / Q000295:instrumentation / Q000379:methods*; D012189:Retrospective Studies; D013997:Time Factors; D062666:Vascular Access Devices