RISK FACTORS ASSOCIATED WITH ENCAPSULATING PERITONEAL SCLEROSIS IN DUTCH EPS STUDY

Objective: Encapsulating peritoneal sclerosis (EPS) is a serious complication of peritoneal dialysis (PD) with a multifactorial pathophysiology and possible increasing incidence. The aim of the present study was to evaluate the independent associations of PD duration, age, dialysis fluids, and kidney transplantation with EPS. Methods: A multicenter case-control study was performed in the Netherlands from 1 January 1996 until 1 July 2007. The population comprised 63 patients with EPS and 126 control patients. Control patients were selected from the national registry and were matched for date of PD start. Associations were analyzed using a log linear regression model. Primary outcome was appearance of EPS. Results: Compared with control patients, patients with EPS were younger at the start of PD (34.7 +/- 15.4 years vs. 51.5 +/- 14.7 years, p < 0.0001). The cumulative period on PD was longer in EPS patients than in control patients (78.7 +/- 37.8 months vs. 32.8 +/- 24 months, p < 0.0001), and the cumulative period on icodextrin was also longer in EPS patients (32.7 +/- 23.3 months vs. 18.1 +/- 15.7 months, p = 0.006). Compared with control patients, more EPS patients underwent kidney transplantation (47 vs. 59, p < 0.0001). With regard to the period after transplantation, the yearly probability of EPS increased in the year after transplantation to 7.5% from 1.75%. In multivariate regression analysis, cumulative PD duration, age at PD start, transplantation, time from last transplantation to EPS, calendar time, time on icodextrin, and ultrafiltration failure were independently associated with EPS. Transfer from PD to hemodialysis for reasons other than suspected EPS could not be identified as a risk factor for EPS. Conclusions: Duration of PD, age at PD start, kidney transplantation, time since last transplantation, ultrafiltration failure, and time on icodextrin were associated with a higher risk of EPS.