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Association between pre-transplant dialysis modality and patient and graft survival after kidney transplantation

Kramer, Anneke; Jager, Kitty J.; Fogarty, Damian G.; Ravani, Pietro; Finne, Patrik; Perez-Panades, Jordi; Prütz, KG LU ; Arias, Manuel; Heaf, James G. and Wanner, Christoph, et al. (2012) In Nephrology Dialysis Transplantation 27(12). p.4473-4480
Abstract
Background. Previous studies have found inconsistent associations between pre-transplant dialysis modality and subsequent post-transplant survival. We aimed to examine this relationship using the instrumental variable method and to compare the results with standard Cox regression. Methods. We included 29 088 patients (age > 20 years) from 16 European national or regional renal registries who received a first kidney transplant between 1 January 1999 and 31 December 2008 and were on dialysis before transplantation for a period between 90 days and 10 years. Standard multivariable Cox regression examined the association of individually assigned pre-transplant dialysis modality with post-transplant patient and graft survival. To decrease... (More)
Background. Previous studies have found inconsistent associations between pre-transplant dialysis modality and subsequent post-transplant survival. We aimed to examine this relationship using the instrumental variable method and to compare the results with standard Cox regression. Methods. We included 29 088 patients (age > 20 years) from 16 European national or regional renal registries who received a first kidney transplant between 1 January 1999 and 31 December 2008 and were on dialysis before transplantation for a period between 90 days and 10 years. Standard multivariable Cox regression examined the association of individually assigned pre-transplant dialysis modality with post-transplant patient and graft survival. To decrease confounding-by-indication through unmeasured factors, we applied the instrumental variable method that used the case-mix adjusted centre percentage of peritoneal dialysis (PD) as predictor variable. Results. Standard analyses adjusted for age, sex, primary renal disease, donor type, duration of dialysis, year of transplantation and country suggested that PD before transplantation was associated with better patient [hazard ratio, HR (95% CI) = 0.83 (0.76-0.91)] and graft survival (HR (95% CI) 0.90 (0.84-0.96)) when compared with haemodialysis (HD). In contrast, the instrumental variable analysis showed that a 10% increase in the case-mix adjusted centre percentage of patients on PD was neither associated with post-transplant patient survival [HR (95% CI = 1.00 (0.97-1.04)] nor with graft survival [HR (95% CI) = 1.01 (0.98-1.04)]. Conclusions. The instrumental variable method failed to confirm the associations found in standard Cox regression between pre-transplant dialysis modality and patient and graft survival after transplantation. The lack of association in instrumental variable analysis may be due to better control of residual confounding. (Less)
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publication status
published
subject
keywords
confounding, dialysis, Europe, instrumental variable, kidney, transplantation, survival
in
Nephrology Dialysis Transplantation
volume
27
issue
12
pages
4473 - 4480
publisher
Oxford University Press
external identifiers
  • wos:000312645800038
  • scopus:84871202860
ISSN
1460-2385
DOI
10.1093/ndt/gfs450
language
English
LU publication?
yes
id
7a2f5e4e-1e83-49b4-ac58-9285aa0ee8b0 (old id 3366257)
date added to LUP
2013-02-01 06:56:31
date last changed
2017-09-10 03:54:34
@article{7a2f5e4e-1e83-49b4-ac58-9285aa0ee8b0,
  abstract     = {Background. Previous studies have found inconsistent associations between pre-transplant dialysis modality and subsequent post-transplant survival. We aimed to examine this relationship using the instrumental variable method and to compare the results with standard Cox regression. Methods. We included 29 088 patients (age > 20 years) from 16 European national or regional renal registries who received a first kidney transplant between 1 January 1999 and 31 December 2008 and were on dialysis before transplantation for a period between 90 days and 10 years. Standard multivariable Cox regression examined the association of individually assigned pre-transplant dialysis modality with post-transplant patient and graft survival. To decrease confounding-by-indication through unmeasured factors, we applied the instrumental variable method that used the case-mix adjusted centre percentage of peritoneal dialysis (PD) as predictor variable. Results. Standard analyses adjusted for age, sex, primary renal disease, donor type, duration of dialysis, year of transplantation and country suggested that PD before transplantation was associated with better patient [hazard ratio, HR (95% CI) = 0.83 (0.76-0.91)] and graft survival (HR (95% CI) 0.90 (0.84-0.96)) when compared with haemodialysis (HD). In contrast, the instrumental variable analysis showed that a 10% increase in the case-mix adjusted centre percentage of patients on PD was neither associated with post-transplant patient survival [HR (95% CI = 1.00 (0.97-1.04)] nor with graft survival [HR (95% CI) = 1.01 (0.98-1.04)]. Conclusions. The instrumental variable method failed to confirm the associations found in standard Cox regression between pre-transplant dialysis modality and patient and graft survival after transplantation. The lack of association in instrumental variable analysis may be due to better control of residual confounding.},
  author       = {Kramer, Anneke and Jager, Kitty J. and Fogarty, Damian G. and Ravani, Pietro and Finne, Patrik and Perez-Panades, Jordi and Prütz, KG and Arias, Manuel and Heaf, James G. and Wanner, Christoph and Stel, Vianda S.},
  issn         = {1460-2385},
  keyword      = {confounding,dialysis,Europe,instrumental variable,kidney,transplantation,survival},
  language     = {eng},
  number       = {12},
  pages        = {4473--4480},
  publisher    = {Oxford University Press},
  series       = {Nephrology Dialysis Transplantation},
  title        = {Association between pre-transplant dialysis modality and patient and graft survival after kidney transplantation},
  url          = {http://dx.doi.org/10.1093/ndt/gfs450},
  volume       = {27},
  year         = {2012},
}