Dialysis is of two types.
Hemo-Dialysis is done for acute kidney failure and chronic renal failure. In acute renal failure we introduce a catheter in the femoral vein or internal jugular vein.
The dialysis removes the excess urea and creatinine and other waste products. This is a temporary form of dialysis and is done till the kidneys of the patient recover.
Hemo-Dialysis in chronic renal failure is done when the both the kidneys of the patient have been damaged permanently. This should be done three times a week.
Peritoneal Dialysis also known as CAPD is a form of dialysis which can be done at home by the patient. A special catheter is introduced in the peritoneal cavity and dialysis fluid is run into this cavity where it stays for 4 hours and then the patient drains out this fluid.
Dialysis takes place inside the peritoneal cavity and urea creatinine and other waste products are removed.