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Peritoneal Dialysis

Peritoneal Dialysis

Peritoneal dialysis (PD) is a treatment for patients with severe chronic kidney disease. The process uses the patient’s peritoneum in the abdomen   as a membrane across which fluids and dissolved substances are exchanged from the blood. Fluid is introduced through a permanent tube in the abdomen and flushed out either every night while the patient sleeps (automatic peritoneal dialysis) or via regular exchanges throughout the day (continuous ambulatory peritoneal dialysis). PD is used as an alternative to haemodialysis  though it is far less commonly used in many countries. It has comparable risks but is significantly less costly in most parts of the world, with the primary advantage being the ability to undertake treatment without visiting a medical facility. The primary complication of PD is infection due to the presence of a permanent tube in the abdomen. In this technique the peritoneum and vessels act as dialysis

Types of Peritoneal Dialysis (PD)

Intermittent peritoneal dialysis (IPD)

It  is usually performed with hourly exchanges of 2 liters of dialysate and continued for 48-72 hours. In can be done manually or by automatic apparatus. This techniques is of only limited usefulness in intensely catabolic patients and in cases of drug intoxication. This technique provides a temporary urea clearance of approximately 20 ml / minute.

Continuous ambulatory peritoneal dialysis  (CAPD)

In this technique a 2 liter exchange is performed by the patient 4 times daily. 2 liters of commercial dialysate fluid contained in a soft plastic bag runs into the peritoneal catheter. The empty bag remains connected to the peritoneal catheter, is rolled up and held under a light waistband. After dwelling over night or for 4-6 hours during the day, the fluid is drained back into the empty bag, tis is discarded, a new dag is connected and fresh-dialysate runs into the abdomen. The exchange can be completed in 30 minutes. Continuous Cyclic Peritoneal Dialysis (CCPD) is a modification of CAPD, using an automated cycle to perform exchanges while the patient sleeps at night. 

Advantages and disadvantages of CAPD

Contraindications of PD

Hyper catabolic state, serious arrhythmias

Diseases of abdominal wall or peritoneum

Respiratory insufficiency.

Possible indications for short term dialysis

Acute renal failure

Fluid overload

Uncontrolled hypercalcemia

Gross electrolyte disturbance

Poisoning with salicylates, barbiturates , ethanol

Acute on chronic renal failure prior to establishing conservative therapy.

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