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Peritoneal Dialysis – How It Works and When It Is Used

Peritoneal dialysis is a kidney replacement therapy that uses the lining of the abdomen as a natural filter to remove waste products and excess fluid from the blood.

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Things worth knowing about "Peritoneal Dialysis"

Peritoneal dialysis is a kidney replacement therapy that uses the lining of the abdomen as a natural filter to remove waste products and excess fluid from the blood.

What is Peritoneal Dialysis?

Peritoneal dialysis (PD) is a form of renal replacement therapy used in patients with severe kidney failure or end-stage renal disease. Unlike hemodialysis, which filters blood outside the body using a machine, peritoneal dialysis uses the body's own peritoneum – the membrane lining the abdominal cavity – as a natural filter. A sterile cleansing fluid called dialysate is introduced into the abdomen through a permanent catheter, absorbs waste products and excess water from the blood, and is then drained away.

When is Peritoneal Dialysis Used?

Peritoneal dialysis is recommended in the following situations:

End-stage chronic kidney disease (terminal renal failure)
Acute kidney injury when other methods are not suitable
Patients who prefer home-based dialysis or live far from hemodialysis centers
Children and elderly patients who benefit from a gentler form of dialysis
Patients with limited vascular access for hemodialysis

How Does Peritoneal Dialysis Work?

The mechanism of peritoneal dialysis is based on two physical principles:

Diffusion: Waste substances such as urea and creatinine pass through the peritoneal membrane from the blood into the dialysate, which has a lower concentration of these substances.
Osmosis (Ultrafiltration): An osmotic agent in the dialysate – typically glucose – draws excess fluid from the blood into the abdominal cavity.

After a defined period of time called the dwell time, the used dialysate is drained and replaced with fresh solution. This process is called an exchange or cycle.

Types of Peritoneal Dialysis

Continuous Ambulatory Peritoneal Dialysis (CAPD)

CAPD requires the patient to perform manual exchanges, typically 3 to 5 times per day. The dialysate remains in the abdominal cavity throughout the day and night. This method requires no machine and can be performed at home or while traveling.

Automated Peritoneal Dialysis (APD)

APD uses a device called a cycler to automatically perform exchanges, usually overnight while the patient sleeps. During the day, the patient is free from exchanges. This method is particularly suitable for working patients or children.

Advantages and Disadvantages of Peritoneal Dialysis

Advantages

Can be performed at home – promotes independence and quality of life
Gentler on the cardiovascular system compared to hemodialysis
No needles or vascular access required
More continuous detoxification throughout the day
Greater flexibility in daily routine, especially with APD

Disadvantages

Risk of peritonitis (inflammation of the peritoneum) due to bacterial contamination
Requires daily discipline and strict hygiene practices
Long-term suitability of the peritoneum as a dialysis membrane is limited
Glucose load from the dialysate may lead to weight gain and metabolic changes
Effectiveness decreases over time, especially as residual kidney function declines

Possible Complications

Peritonitis: The most common and serious complication – bacterial or fungal infection of the peritoneal membrane
Catheter site infections at the point of catheter insertion
Hernias due to increased intra-abdominal pressure
Fluid overload or dehydration from incorrect dialysis dosing
Metabolic disturbances such as elevated blood sugar or changes in lipid metabolism

Daily Life with Peritoneal Dialysis

Patients undergoing peritoneal dialysis receive thorough training to safely and hygienically perform exchanges. Regular check-ups with the nephrology team are essential to monitor dialysis effectiveness and detect complications early. Dietary adjustments are necessary, particularly regarding potassium, phosphate, and fluid intake.

References

Kidney Disease: Improving Global Outcomes (KDIGO) – Clinical Practice Guideline for Acute Kidney Injury. KDIGO, 2012. Available at: https://kdigo.org
Daugirdas JT, Blake PG, Ing TS (eds.) – Handbook of Dialysis. 5th edition. Wolters Kluwer, 2015.
National Kidney Foundation – Peritoneal Dialysis: What You Need to Know. Available at: https://www.kidney.org

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