Peritoneal dialysis

The peritoneum is a good biological semi-permeable membrane, which has good functions of diffusion, penetration, secretion and absorption. Adult peritoneal area is about 2.2m 2, which is larger than the surface area of ​​1.5m 2 of glomerular capillaries of bilateral kidney. When the disease requires, the peritoneum can be used as a dialysis membrane. Through dialysis with the blood in the surface blood vessels of the peritoneum, the metabolites accumulated in the body and excess electrolyte can be discharged with the dialysate, thereby eliminating toxic substances in the body and regulating water and electrolytes. And the purpose of acid-base balance. The peritoneum has different ability to remove various solutes. Urea is cleared faster, potassium, chlorine, sodium, creatinine is second, uric acid and carbonate are slower, and calcium and magnesium are slower. Generally, dialysis of 8000 ～ 10000ml as a course of treatment can reduce urea nitrogen by an average of 3.3 ～ 7.8mmol / l daily, and can bring out about 500 ～ 1500ml of water; potassium-free dialysate can remove 7.8 ～ 9.5mmol of potassium daily. / l.