title: Estimating Waiting Time for Deceased Donor Renal Transplantion in the Era of New Kidney Allocation System.
abstract: BACKGROUND
  On December 4, 2014, a new deceased donor kidney allocation system (KAS) was implemented. The KAS was designed to improve organ equity and graft-recipient longevity matching. However, estimated wait-time to deceased donor transplantation is difficult to predict post-KAS.
  
  
  METHODS
  Using the Kidney-Pancreas Simulated Allocation Model software (KPSAM), a program that the Organ Procurement and Transplant Network uses to assess policy proposals, we compared the kidney allocations of both the new (post-KAS) and old policies (pre-KAS) (10 iterations for each group; total N = 204,148) and estimated wait-time based on blood type, duration of dialysis exposure, and calculated panel-reactive antibody (CPRA).
  
  
  RESULTS
  The simulations revealed that estimated median (25(th) and 75(th) percentile) waiting time in transplanted recipients decreased from 2.3 (1.2, 3.8) years in the old allocation to 1.8 (0.8, 3.4) years in the new allocation system. The rate of transplantations performed within the first year of wait-listing increased from 20.7% to 31.3%. The KPSAM resulted in more transplantations in recipients with more than 5 years of dialysis exposure (26.5% to 37.4%), longevity matching (12.2% to 17.5%), blood group B (12.6% to 17.2%), and high CPRA ≥98% (1.9% to 4.3%) in post-KAS compared with pre-KAS simulations.
  
  
  CONCLUSIONS
  Based on the KPSAM results, it was projected that post-KAS wait-time in transplanted recipients might decrease approximately 6 months (22%) across all CPRA categories. It might be related to the KAS awarding waiting time points for prelisting dialysis time and priority points awarded based on CPRA (bolus effect).
authors: Neurobiology Department, University of Texas at Dallas, Dallas, Texas, USA.
authors: F
authors: F
authors: Torlak
authors: Information Systems and Operations Management, University of Texas at Dallas, Dallas, Texas, USA.
authors: M U S
authors: MU
authors: Ayvaci
authors: IBM Research, Yorktown Heights, New York, USA.
authors: M E
authors: ME
authors: Ahsen
authors: Division of Nephrology, UT Southwestern Medical Center, Dallas, Texas, USA.
authors: C
authors: C
authors: Arce
authors: Division of Nephrology, UT Southwestern Medical Center, Dallas, Texas, USA.
authors: M A
authors: MA
authors: Vazquez
authors: Division of Nephrology, UT Southwestern Medical Center, Dallas, Texas, USA. Electronic address: bekir.tanriover@utsouthwestern.edu.
authors: B
authors: B
authors: Tanriover
mesh_terms: D006801:Humans; D016030:Kidney Transplantation / Q000379:methods; D014019:Tissue Donors; D009927:Tissue and Organ Procurement / Q000331:legislation & jurisprudence* / Q000379:methods*; D019737:Transplants / Q000600:supply & distribution*; D014850:Waiting Lists