Peritoneal dialysis in incident patients with primary glomerulonephritis. Results of a 20-year multicenter registry study.

BACKGROUND AND OBJECTIVES: Glomerulonephritis (GN) is one of the main causes of chronic terminal kidney disease; however, few studies assess its prognosis in dialysis. We analyze the survival and characteristics of patients on peritoneal dialysis (PD) with primary GN (PGN), and compare their results with other kidney patients. METHODS: This prospective observational study took place from 1995 to 2014. We included all incident patients who were initiated on the technique in the Levante registry. Data were transferred to an anonymized database in Access. Statistical analysis was performed using SPSS software (version 19.0). RESULTS: The study included 2243 patients, with GN representing the main cause of primary kidney disease (21,5%). IgA nephropathy was the most frequent histologically confirmed form of PGN. Compared with the rest of the sample, patients with PGN were more often men (65% vs 58%, p = .004), and they were on average younger (48 years vs 55 years, p < .001). They also had fewer comorbidities and a higher rate of inclusion on the waitlist for a kidney transplant (87 vs 63%, p < .001). Patients with PGN also had more transplants (48,9%, p < .001), and this was the most frequent reason for stopping PD; beyond that, their peritonitis mean rate was lower (0,34 vs 0,45 episodes/patient-year, p < .001). Technique survival was 90,6% at one year, 71,7% at 3 years, and 59,0% at 5 years (median 76,8 months); there were no differences between groups. Survival was 94,9% at one year, 80,1% at 3 years, and 63,7% at 5 years (median 90,7 months). Patients with PGN showed better mean survival than patients with other kidney pathologies (153,5 months [95% IC: 137,0-169,9] vs 110,3 months [95% CI: 100,8-119,7], p < .001). In the multivariable analysis, the main negative risk factor influencing technique survival was a higher peritoneal transport (p = .018). Factors with a negative influence on mortality were being older (p < .001) and having any comorbidity, mainly diabetes and liver disease (p < .001). By contrast, protective survival factors were inclusion on the transplant waitlist and a higher baseline residual renal function (p = .001). CONCLUSIONS: PD has several advantages as a first dialytic treatment, and our results suggest that it is an excellent technique to manage patients with PGN while they await a kidney transplant.