Peritoneal dysfunction is a common complication in patients in stable treatment with peritoneal dialysis. This peritoneal dysfunction is defined by an elevated creatinine transport and lowered standardized ultrafiltration capacity. The aim of this study is to evaluate the efficacy of the addition of bemiparin to icodextrin solution in patients in peritoneal dialysis with peritoneal transport disorders. The eligible patients are randomly assigned to receive the icodextrin solution with bemiparin or icodextrin solution without bemiparin.