Differences in clinical and laboratory data of peritoneal dialysis patients selected according to body mass index

The aim of the present study was to compare parameters of dietary intake, nutritional status, dialysis adequacy, and laboratory data between continuous ambulatory peritoneal dialysis (CAPD) patients having a normal body mass index (BMI) and those having an increased BMI. Two groups were selected: BMI = 20-25 (group I, n = 29) and BMI = 25-30 (group II, n = 19). No difference in age or peritoneal dialysis duration were observed between the study groups. Among parameters of dietary intake, only vitamin C ingestion was higher in group II than in group I. As compared with the patients in group I, the patients in group II showed significantly higher total body mass, lean body mass, fat body mass, and total body water. The Kt/V was lower in group II than in group I. In group II, values of serum iron concentration and transferrin saturation were both lower than those seen in group I. No differences were observed between the study groups for the other examined parameters. Those results show that overweight CAPD patients have higher anthropometric parameters and a lower Kt/V owing to a higher urea distribution volume. Disorders in iron parameters are more frequent in overweight patients. The observed differences do not influence duration of peritoneal dialysis treatment.