• Miklos Z Molnar, Rajnish Mehrotra, Uyen Duong, Suphamai Bunnapradist, Lilia R Lukowsky, Mahesh Krishnan, Csaba P Kovesdy, and Kamyar Kalantar-Zadeh.
• Harold Simmons Center for Chronic Disease Research and Epidemiology, Harbor-University of California at Los Angeles Medical Center, Torrance, CA 90509-2910, USA.
• Clin J Am Soc Nephrol. 2012 Feb 1; 7 (2): 332-41.

Background And ObjectivesThe influence of pretransplant dialysis modality on post-transplant outcomes is not clear. This study examined associations of pretransplant dialysis modality with post-transplant outcomes in a large national cohort of kidney transplant recipients.Design, Setting, Participants, & MeasurementsLinking the 5-year patient data of a large dialysis organization to the Scientific Registry of Transplant Recipients, 12,416 hemodialysis and 2092 peritoneal dialysis patients who underwent first kidney transplantation were identified. Mortality or graft failure and delayed graft function risks were estimated by Cox regression (hazard ratio) and logistic regression (odds ratio), respectively.ResultsRecipients treated with peritoneal dialysis pretransplantation had lower (21.9/1000 patient-years [95% confidence interval: 18.1-26.5]) crude all-cause mortality rate than those recipients treated with hemodialysis (32.8/1000 patient-years [30.8-35.0]). Pretransplant peritoneal dialysis use was associated with 43% lower adjusted all-cause and 66% lower cardiovascular death. Furthermore, pretransplant peritoneal dialysis use was associated with 17% and 36% lower unadjusted death-censored graft failure and delayed graft function risk, respectively. However, after additional adjustment for relevant covariates, pretransplant peritoneal dialysis modality was not a significant predictor of death-censored graft failure delayed graft function, respectively. Similar trends were noted on analyses using a propensity score matched cohort of 2092 pairs of patients.ConclusionsCompared with hemodialysis, patients treated with peritoneal dialysis before transplantation had lower mortality but similar graft loss or delayed graft function. Confounding by residual selection bias cannot be ruled out.

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