title: A systematic review of kidney transplantation from expanded criteria donors.
abstract: BACKGROUND
  During the past few years, there has been renewed interest in the use of expanded criteria donors (ECD) for kidney transplantation to increase the numbers of deceased donor kidneys available. More kidney transplants would result in shorter waiting times and limit the morbidity and mortality associated with long-term dialysis therapy.
  
  
  METHODS
  Systematic review of the literature.
  
  
  METHODS
  Kidney transplantation population.
  
  
  METHODS
  Studies were identified by using a comprehensive search through MEDLINE and EMBASE databases. Inclusion criteria were case series, cohort studies, and randomized controlled trials assessing kidney transplantation in adult recipients using ECDs.
  
  
  METHODS
  A special focus was given to studies comparing the evolution of kidney transplantation between standard criteria donors (defined as a donor who does not meet criteria for donation after cardiac death or ECD) and ECDs (defined as any brain-dead donor aged > 60 years or a donor aged > 50 years with 2 of the following conditions: history of hypertension, terminal serum creatinine level >or= 1.5 mg/dL, or death resulting from a cerebrovascular accident).
  
  
  RESULTS
  Criteria used to define and select ECDs, practice patterns, long-term outcomes, early complications, and some patient issues, such as selection criteria and immunosuppressive management.
  
  
  RESULTS
  ECD kidneys have worse long-term survival than standard criteria donor kidneys. The optimal ECD kidney for donation depends on adequate glomerular filtration rate and acceptable donor kidney histological characteristics, albeit the usefulness of biopsy is debated.
  
  
  CONCLUSIONS
  This review is based mainly on data from observational studies, and varying amounts of bias could be present. We did not attempt to quantitatively analyze the effect of ECD kidneys on kidney transplantation because of the huge heterogeneity found in study designs and definitions of ECD.
  
  
  CONCLUSIONS
  Based on the available evidence, we conclude that patients younger than 40 years or scheduled for kidney retransplantation should not receive an ECD kidney. Patients 40 years or older, especially with diabetic nephropathy or nondiabetic disease, but a long expected waiting time for kidney transplantation, show better survival receiving an ECD kidney than remaining on dialysis therapy.
authors: Servicio de Nefrología, Hospital Ramón y Cajal, Madrid, Spain.
authors: Julio
authors: J
authors: Pascual
authors: Javier
authors: J
authors: Zamora
authors: John D
authors: JD
authors: Pirsch
mesh_terms: D000367:Age Factors; D001926:Brain Death; D003404:Creatinine / Q000097:blood; D006801:Humans; D006973:Hypertension; D016030:Kidney Transplantation; D008499:Medical Records; D018579:Patient Selection; D020521:Stroke / Q000401:mortality; D016019:Survival Analysis; D014019:Tissue Donors; D009927:Tissue and Organ Procurement / Q000379:methods*; D014850:Waiting Lists
chemical_list: D003404:Creatinine