[Agents preventing decrease in ultrafiltration in a rat model with peritoneal hyperpermeability]

Ultrafiltration failure has been one of the major causes of drop out from CAPD treatment. The present study was designed to develop an ultrafiltration failure model in the rat and to assess whether various agents could prevent a decrease in ultrafiltration capacity in this rat model. Peritoneal hyperpermeability was induced by repeated intraperitoneal injection of 15 ml of 4.25% dextrose dialysate for 7 days. Some of the rats received agents, such as phosphatidylcholine, chondroitin sulfate, siliac acid, heparan sulfate, keratan sulfate, sodium sulfate, sodium phosphate, and heparin sodium, simultaneously administered with 4.25 % dextrose dialysate for the same duration. Ultrafiltration volume, D4/D0 ratio of glucose and peritoneal net fluid absorption were evaluated by 4-hour dwelling of 30 ml of 2.5% dextrose dialysate. Sodium phosphate and heparan sulfate prevented peritoneal hyperpermeability due to repeated injection of hypertonic dialysate. Sodium phosphate, sodium sulfate, heparin and heparan sulfate suppressed peritoneal net fluid absorption, resulting in an increase in ultrafiltration. These findings may be applicable to CAPD patients with ultrafiltration loss.