Hemodialysis vs Peritoneal Dialysis: What’s the Difference?

When the kidneys can no longer remove enough waste and extra fluid from the body, dialysis may be needed. Dialysis helps perform some of the work that healthy kidneys normally do.

There are two main types of dialysis:

1. Hemodialysis (HD)
2. Peritoneal Dialysis (PD)

Both treatments help remove waste and extra fluid from the blood, but they work in different ways. The right choice depends on a person’s health, lifestyle, medical needs, and personal preferences.

What Is Hemodialysis?

Hemodialysis uses a special machine and a filter called a dialyzer to clean the blood.

During treatment, blood travels from the body to the dialysis machine. The dialyzer removes waste products and extra fluid from the blood, and the cleaned blood is then returned to the body.

Hemodialysis is commonly performed at a dialysis center, although some patients may be able to receive treatment at home after appropriate training.

What Is Peritoneal Dialysis?

Peritoneal dialysis uses the lining of the abdomen, called the peritoneum, as a natural filter.

A soft tube called a catheter is placed into the abdomen. A special dialysis fluid is put into the abdomen through the catheter. The fluid absorbs waste and extra fluid from the blood through the peritoneal lining.

After some time, the used fluid is drained and replaced with fresh dialysis fluid.

How Does Peritoneal Dialysis Work?

Peritoneal dialysis uses a catheter in the abdomen.

During treatment:

1. Dialysis fluid enters the abdomen through the catheter.
2. The fluid remains inside for a specific period.
3. Waste and extra fluid move from the blood into the dialysis fluid.
4. The used fluid is drained.
5. Fresh dialysis fluid is put into the abdomen.

There are two common forms of peritoneal dialysis.

Continuous Ambulatory Peritoneal Dialysis (CAPD)

CAPD is performed manually. The patient changes the dialysis fluid several times during the day.

Automated Peritoneal Dialysis (APD)

APD uses a machine called a cycler, usually while the patient sleeps.

What Are the Advantages of Hemodialysis?

Hemodialysis can offer several benefits:

• Treatment is performed by trained dialysis staff in a dialysis center.
• Patients may have a regular treatment schedule.
• Home hemodialysis may be an option for some patients.
• The dialysis machine can efficiently remove waste and extra fluid during treatment.

However, regular trips to a dialysis center can be difficult for some people, and treatment schedules need to be followed carefully.

What Are the Advantages of Peritoneal Dialysis?

Peritoneal dialysis may provide more flexibility for some patients because it can generally be performed at home.

Possible benefits include:

• Treatment can be done at home.
• Some patients can fit treatment around work or daily activities.
• There is no need for repeated needle insertion into an AV fistula during each treatment.
• Automated treatment can be performed during sleep.

However, patients need to learn how to perform the treatment safely and keep the catheter and equipment clean.

What Are the Possible Risks?

Both types of dialysis have possible risks.

Hemodialysis Risks

Some patients may experience:

• Low blood pressure during treatment
• Muscle cramps
• Tiredness after dialysis
• Problems with vascular access
• Infection
• Blood clots or access blockage

Peritoneal Dialysis Risks

The most important complication is peritonitis, which is an infection inside the abdomen.

Other possible problems include:

• Catheter infection
• Hernia
• Weight gain
• Problems with fluid balance
• Abdominal discomfort

Following proper hygiene and dialysis instructions can help reduce the risk of infection.

Which Dialysis Is Better?

There is no single dialysis method that is best for every patient.

The choice may depend on:

• Kidney function
• Other health conditions
• Heart health
• Previous surgeries
• Ability to manage treatment at home
• Home environment
• Lifestyle and work schedule
• Personal preference
• Availability of dialysis services
• Advice from the kidney-care team

A nephrologist can discuss the advantages and disadvantages of each option and help determine which treatment may be appropriate.

Can Patients Change From One Type of Dialysis to Another?

Sometimes, yes.

A patient’s health, lifestyle, dialysis access, or other circumstances may change over time. In some cases, a person may move from peritoneal dialysis to hemodialysis or from one form of treatment to another.

The medical team can explain the available options based on the patient’s condition.

What About Kidney Transplant?

Dialysis is one treatment for kidney failure, but it is not the only option.

For some suitable patients, a kidney transplant may be considered. A transplant involves placing a healthy kidney from a suitable donor into the patient’s body.

Not everyone is eligible for transplantation, and some people may need dialysis before or after a transplant.

Final Thoughts

Hemodialysis and peritoneal dialysis both help remove waste and extra fluid when the kidneys cannot do this adequately. The main difference is how the blood is cleaned.

Hemodialysis uses a dialysis machine and an artificial filter, while peritoneal dialysis uses the lining of the abdomen as a natural filter.

The right treatment depends on each person’s medical condition, lifestyle, home situation, and preferences.