title: Chronic kidney disease in kidney transplant recipients-is it different from chronic native kidney disease?
abstract: BACKGROUND
  The rate of change in estimated glomerular filtration rate (ΔeGFR), factors influencing ΔeGFR, and its association with mortality has not been well studied in renal transplant recipients. METHODS.: Adult kidney-only recipients between January 2001 and December 2004, with surviving grafts 1 year after transplantation, from England and Wales were followed up till 31 December 2006, graft failure or death. The four variable modification of diet in renal disease equation was used to estimate GFR and ΔeGFR assessed using linear least square regression. ΔeGFR of -1 mL/min/1.73m per year and above was considered to be stable or improving function. Linear regression and Cox regression analyses were used to examine factors influencing ΔeGFR and its association with mortality, respectively.
  
  
  RESULTS
  Of the 2, 927 patients included, ΔeGFR was -1.3±6.0 mL/min/1.73 m per year and eGFR remained stable or improved in the majority (54.8%). Baseline graft function at 1 year or live donor status did not influence ΔeGFR. Male donor to female recipient transplantation, younger recipients, diabetes, white race, and human leukocyte antigen mismatch were associated with faster decline in eGFR. ΔeGFR was not associated with mortality when censored for graft failure.
  
  
  CONCLUSIONS
  Majority of renal transplant recipients experienced stable or improved graft function. Specific donor and recipient characteristics influenced the rate of decline in eGFR. The lack of association of ΔeGFR with mortality, the stability of eGFR in the majority, and influence of donor characteristics on ΔeGFR suggest caution when applying prognosis knowledge from the native kidney disease to the kidney transplant population.
authors.affiliation: Richard Bright Renal Unit, Southmead Hospital, Southmead Road, Bristol, United Kingdom. udaya.udayaraj@nbt.nhs.uk
authors.forename: Udaya P
authors.initials: UP
authors.lastname: Udayaraj
authors.forename: Anna
authors.initials: A
authors.lastname: Casula
authors.forename: David
authors.initials: D
authors.lastname: Ansell
authors.forename: Christopher R K
authors.initials: CR
authors.lastname: Dudley
authors.forename: Rommel
authors.initials: R
authors.lastname: Ravanan
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002908:Chronic Disease / Q000453:epidemiology; D003928:Diabetic Nephropathies / Q000601:surgery; D005260:Female; D005919:Glomerular Filtration Rate; D005921:Glomerulonephritis / Q000601:surgery; D006801:Humans; D007674:Kidney Diseases / Q000453:epidemiology*; D016030:Kidney Transplantation / Q000401:mortality / Q000473:pathology* / Q000502:physiology; D008297:Male; D008875:Middle Aged; D007690:Polycystic Kidney Diseases / Q000601:surgery; D015996:Survival Rate; D014019:Tissue Donors / Q000706:statistics & numerical data