What are the differences between peritoneal dialysis and hemodialysis?

Feb 25, 2023 Source: Cainiu Health

Dr. Zhao Xinju

Introduction

The main differences between peritoneal dialysis and hemodialysis lie in the method of implementation, convenience, dialysate composition, treatment duration, and protection of residual kidney function. It is important to get plenty of rest and maintain a positive mindset during either peritoneal or hemodialysis. Avoid excessive tension or mental stress to prevent interference with the treatment.

The main differences between peritoneal dialysis and hemodialysis lie in the method of implementation, convenience, dialysate composition, treatment frequency, and residual kidney function protection. The specific analysis is as follows:

1. Method of Implementation

Peritoneal dialysis involves infusing dialysate into the abdominal cavity, using the patient's own peritoneum as a membrane for substance exchange. Waste products and excess fluid in the blood pass through the peritoneum into the dialysate, which is then drained out of the body to remove these substances. In contrast, hemodialysis works by diverting the patient's blood into a dialysis machine, where a semipermeable membrane filters out waste and excess fluid before returning the purified blood to the body.

2. Convenience

Peritoneal dialysis can be performed by patients at home and generally requires longer dwell times. Hemodialysis, however, is usually conducted at medical facilities, with each session typically lasting 2 to 4 hours.

3. Dialysate Composition

The composition of the dialysate used in peritoneal dialysis differs from that used in hemodialysis. Peritoneal dialysate contains substances such as glucose, which helps remove waste and regulate fluid balance across the peritoneal membrane. Hemodialysis uses glucose-free physiological saline solution, primarily relying on a semipermeable membrane to remove waste and excess fluid.

4. Treatment Frequency

Patients undergoing hemodialysis usually follow medical advice to receive treatment 2 to 3 times per week at a hospital. Patients on peritoneal dialysis may perform 3 to 4 exchanges daily.

5. Residual Kidney Function Protection

Peritoneal dialysis achieves its therapeutic goal—removal of metabolic waste, toxins, and correction of water and electrolyte imbalances—through continuous exchange of dialysate in the abdominal cavity. It is generally more effective in preserving residual kidney function. Hemodialysis relies on principles of diffusion, ultrafiltration, adsorption, and convection to remove excess fluid and toxins. However, it is less effective in protecting residual kidney function.

Note: During either peritoneal or hemodialysis, patients should ensure adequate rest, maintain a positive mindset, and avoid excessive anxiety or mental stress, as these may negatively affect treatment outcomes.

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How is peritoneal dialysis catheter removal performed?

Peritoneal dialysis catheter removal generally refers to the procedure of removing the catheter after completion of peritoneal dialysis. The peritoneal dialysis catheter can be removed, but the procedure should be performed by a specialized physician in an operating room. The patient is placed in a supine position. The anesthesiologist administers local anesthesia near the catheter site, while the surgeon performs routine disinfection of the area around the catheter and drapes the field. After the anesthesia takes effect, the surgeon makes an incision at the catheter site using a scalpel.

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Principle of peritoneal dialysis

The principle of peritoneal dialysis treatment involves using the peritoneum as a semipermeable membrane and utilizing changes in osmotic pressure to facilitate the exchange of solutes and water. Additionally, when patients experience reduced outflow volume during peritoneal dialysis, they should pay attention to controlling their intake of fluids and salt, maintain a light diet, avoid high-fat and high-calorie foods, and consume more nutritious fruits and vegetables.

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How many years does peritoneal dialysis usually last before switching to hemodialysis?

There is no specific timeframe for switching from peritoneal dialysis to hemodialysis; the decision depends on clinical manifestations, laboratory tests, and other evaluations. Peritoneal dialysis involves using dialysis fluid in the abdominal cavity to remove toxins from the body, thereby reducing toxin levels in the blood. If renal replacement therapy is needed, patients should visit a正规 hospital for evaluation and receive treatment under medical guidance.

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Peritoneal dialysis catheter removal procedure steps

Peritoneal dialysis catheter removal, also known as the "Pull technique," refers to the procedure of continuously pulling the peritoneal dialysis catheter after local infiltration anesthesia until the entire catheter is removed. This procedure must be performed at a正规 medical facility. After surgery, patients should consume more high-protein foods, but if there is excessive fluid, phosphorus, or other substances in the body, fluid intake should be restricted.