Factors associated with overhydration in peritoneal dialysis patients

Aim. Overhydration is a prevalent problem in peritoneal dialysis (PD) patients. The aim of the study was to evaluate the effect of several factors on the development of overhydration in PD patients. Material and Methods. The study was performed on 74 PD patients, who were divided into two groups according to bioimpedance analysis hydration status (OHBIA): Group A OHBIA < 1.1 L (n = 40) and Group B OHBIA ≥ 1.1 L (n = 34). The assessments of the adequacy of the dialysis dosage were based on the Kt/V ratio as well as weekly creatinine clearance. To evaluate the permeability of the peritoneal membrane a standard peritoneal equilibration test was used. Results. A statistically significant difference between the groups was found in: the average age of patients (53 ± 18 vs. 62 ± 14 years; p < 0.03), the prevalence of diabetes (27.5% vs. 55.9%; p < 0.02) and residual diuresis (1.7 ± 0.8 vs 1.2 ± 0.9 L; p < 0.05). There was no statistically significant difference in gender distribution, although attention is paid to the greater participation of male in overhydrated group. The study found no statistically significant differences between PD vintage, type of PD, assessment of adequacy of PD and other parameters describing the PD method. Logistic regression model selected diabetes (p < 0.03) as a significant risk factor for the occurrence of hypervolemia. Conclusions. Diabetes and older age are potential predisposing factors for the development of overhydration in PD patients. Overhydrated PD patients may have relatively high parameters regarding adequacy of dialysis therapy. Probably the most important protective factor in PD patients is residual diuresis