title: Risk factors influencing the decline of residual renal function in continuous ambulatory peritoneal dialysis patients.
abstract: OBJECTIVE
  To assess the nature of the decline in residual renal function (RRF) after the initiation of peritoneal dialysis, and to identify risk factors influencing the preservation of RRF.
  
  
  METHODS
  A retrospective single-center study.
  
  
  METHODS
  Tertiary medical center.
  
  
  METHODS
  Eighty patients who were clinically stable and had been on continuous ambulatory peritoneal dialysis (CAPD) for a minimum of 6 months.
  
  
  METHODS
  All subjects had at least three measurements of RRF, which was calculated as the average of creatinine clearance (Ccr) and urea clearance from a 24-hour urine collection. All measurements of RRF were plotted on a logarithmic scale and a linear scale against the duration of CAPD. Covariables used in the correlation analyses were age, sex, the presence of diabetes mellitus, mean blood pressure, mean diastolic blood pressure, hematocrit and Ccr at the start of peritoneal dialysis, peritoneal membrane transport characteristics by peritoneal equilibration test (PET), and the rate of peritonitis.
  
  
  RESULTS
  A significant correlation was found between CAPD duration and RRF decline represented on a logarithmic scale with a correlation coefficient (r) of 0.355 (p < 0.001). In contrast, on a linear scale, the correlation coefficient was only 0.273 (p < 0.01). By linear multiple regression analysis, the only independent risk factor for the decline of RRF was the rate of peritonitis (r = -0.446, p < 0.001).
  
  
  CONCLUSIONS
  These results suggest that RRF declines exponentially rather than linearly with time, and that the rate of peritonitis is an independent risk factor for the decline of RRF in CAPD patients.
authors.affiliation: Department of Internal Medicine, Institute of Kidney Disease, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: S K
authors.initials: SK
authors.lastname: Shin
authors.forename: H
authors.initials: H
authors.lastname: Noh
authors.forename: S W
authors.initials: SW
authors.lastname: Kang
authors.forename: B J
authors.initials: BJ
authors.lastname: Seo
authors.forename: I H
authors.initials: IH
authors.lastname: Lee
authors.forename: H Y
authors.initials: HY
authors.lastname: Song
authors.forename: K H
authors.initials: KH
authors.lastname: Choi
authors.forename: S K
authors.initials: SK
authors.lastname: Ha
authors.forename: H Y
authors.initials: HY
authors.lastname: Lee
authors.forename: D S
authors.initials: DS
authors.lastname: Han
mesh_terms: D005260:Female; D006801:Humans; D007668:Kidney / Q000503:physiopathology*; D007676:Kidney Failure, Chronic / Q000503:physiopathology* / Q000628:therapy; D007677:Kidney Function Tests; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D010531:Peritoneal Dialysis, Continuous Ambulatory; D010538:Peritonitis / Q000453:epidemiology; D012189:Retrospective Studies; D012307:Risk Factors; D013997:Time Factors