Peritoneal dialysis is a life-sustaining treatment that filters waste products and excess fluids from the blood when the kidneys can no longer do this work. This therapy uses the natural lining inside the abdomen as a filter, offering patients the flexibility to perform treatments at home, at work, or even while traveling. Unlike other dialysis methods, peritoneal dialysis allows individuals to maintain a more independent lifestyle while managing kidney failure.

How Peritoneal Dialysis Helps When Kidneys Fail

When the kidneys stop working properly, a condition known as kidney failure or end-stage renal disease, the body can no longer remove harmful waste products and extra water from the blood on its own. Without treatment, these toxins build up in the bloodstream, a dangerous situation called uremia, which can eventually become fatal. The main goal of peritoneal dialysis is to take over the kidney’s filtering function, helping to control blood pressure, manage the balance of minerals and salts in the body (called electrolytes), remove extra fluid, and eliminate toxins that healthy kidneys would normally clear out.^[1][2]

Peritoneal dialysis is particularly important because it can help people feel better and live longer, even though it is not a cure for kidney failure. The treatment is designed to manage symptoms and prevent the serious complications that arise when waste products accumulate in the body. It works by using a special cleansing fluid, known as dialysate, which is introduced into the abdominal cavity through a soft tube called a catheter. The lining of the abdomen, called the peritoneum, acts as a natural filter. Over several hours, the dialysate absorbs waste materials and excess water from the blood vessels in this lining, and then the used fluid is drained out and thrown away.^[1][2]

This approach differs significantly from hemodialysis, which filters blood outside the body using a machine. Peritoneal dialysis offers the advantage of being performed at home, giving patients more control over their schedule and allowing them to continue many of their regular daily activities. However, not everyone with kidney failure is a candidate for this treatment. Patients need to be able to use their hands skillfully to manage the process, or they need a trusted caregiver who can assist them. People with certain medical conditions, such as severe abdominal surgeries or infections, may not be able to use this method.^[1][4]

Standard Treatment: How Peritoneal Dialysis Works in Practice

Before starting peritoneal dialysis, a patient undergoes a minor surgical procedure in which a surgeon places a soft, flexible catheter into the abdomen. This catheter is typically inserted a few weeks before dialysis treatments begin, allowing time for the area to heal properly. Once healing is complete, the patient can start using the catheter to perform dialysis exchanges at home.^[2][4]

The process of peritoneal dialysis involves what is called an exchange. During an exchange, a bag of dialysate solution—composed of water, salt, and other additives—flows through the catheter into the belly. When the bag is empty, the patient disconnects it and places a cap on the catheter, allowing them to move around freely and go about their normal activities. The dialysate stays inside the abdomen for a set period, usually several hours, during which it absorbs waste products and extra fluid from the blood. After this dwell time, the used solution, now filled with waste, is drained back into the empty bag and discarded, often into a toilet or tub. Then the patient begins a new exchange with fresh dialysate. This cycle is repeated multiple times each day—typically four to six times—depending on the type of peritoneal dialysis being used.^[2][4]

There are two main types of peritoneal dialysis that patients can choose from, depending on their lifestyle and medical needs. Continuous ambulatory peritoneal dialysis (CAPD) is a manual method that does not require a machine. With CAPD, the patient performs exchanges during the day by attaching a dialysate bag to the catheter and using gravity to pull the solution into the abdomen. This usually takes about 30 minutes per exchange. Patients perform three to five exchanges each day in any clean, dry, and well-lit place, and they can carry out their normal activities while the fluid is inside their body.^[4][9]

The second main type is automated peritoneal dialysis (APD), also called continuous cycling peritoneal dialysis (CCPD). APD uses a machine known as an automated cycler to add and drain the dialysate automatically. Most people perform APD at night while they sleep, with the machine conducting three to five exchanges during the session. This approach frees up the daytime for work, school, or other activities. A less common variant, intermittent peritoneal dialysis (IPD), also uses an automated cycler but requires longer treatment sessions and is typically performed in a hospital setting.^[4][9]

During treatment, most patients feel normal or may experience a sensation of fullness or bloating in the abdomen. The belly may enlarge slightly, and some people find they need larger-sized clothing. However, pain should not be a regular part of the experience. If pain occurs, it is important to contact a healthcare provider immediately.^[2]

Peritoneal dialysis is the least common type of dialysis, with only about 10% of people who need dialysis receiving this treatment. Several factors contribute to this, including lack of awareness among patients and healthcare providers, a shortage of doctors and nurses trained in peritoneal dialysis, and challenges in providing assistance for patients who need help with the procedure at home. Additionally, if kidney failure happens suddenly and there is no time to place a catheter, patients may need to start hemodialysis instead.^[4]

The therapy duration varies from person to person. Some patients remain on peritoneal dialysis for many years, while others may eventually transition to hemodialysis or receive a kidney transplant. Regular follow-up appointments are necessary to monitor the effectiveness of the treatment. Patients typically have blood samples drawn at a clinic at least once a month, and periodically they must collect their urine and used dialysate over a 24-hour period for laboratory testing. These tests help ensure that the dialysis is adequately filtering the blood and that the patient’s overall health is stable.^[18]

Possible Side Effects and Complications

Like any medical treatment, peritoneal dialysis comes with potential side effects and risks. One of the most common and serious problems is peritonitis, an infection of the peritoneum. This can occur if germs enter the abdomen through the catheter during an exchange. Symptoms of peritonitis include cloudy dialysate, fever, abdominal pain, and feeling very sick or vomiting. If any of these signs appear, it is crucial to contact a healthcare provider immediately, as untreated infections can prevent patients from continuing peritoneal dialysis.^[21]

To reduce the risk of infection, patients are taught to follow strict hygiene practices. This includes always washing hands thoroughly before performing an exchange, wearing a surgical mask during the procedure, keeping all dialysis supplies in a clean and dry place, and conducting exchanges in a clean, well-lit environment. Patients are also advised to watch for signs of infection around the catheter site, such as redness, pain, or discharge, and to notify their doctor if the catheter shifts or if any clamps on the catheter break.^[21][20]

Another concern is fungal peritonitis, which often occurs after prolonged or repeated use of antibiotics. Patients who take antibiotics for extended periods are at higher risk for this type of infection, which can be more difficult to treat than bacterial peritonitis.^[21]

Other potential side effects include weight gain from the glucose (sugar) present in the dialysate, changes in body shape due to the constant presence of fluid in the abdomen, and hernias, which are weaknesses in the abdominal wall that can develop over time. Some patients may also experience back pain or discomfort related to the fluid in their belly. Healthcare providers can help manage these issues through dietary adjustments, medication, or changes to the dialysis prescription.^[4]

Lifestyle Adjustments and Nutrition

One of the significant advantages of peritoneal dialysis is that it typically allows for a less restricted diet compared to hemodialysis. Because peritoneal dialysis is performed more frequently—often daily—it provides more consistent removal of waste and fluid. This means patients may have more flexibility in what they eat and drink, though some dietary guidelines still apply. Patients are usually advised to consume adequate protein to maintain muscle mass and overall health, manage their intake of phosphorus and potassium, and monitor their sodium and fluid intake to avoid swelling and high blood pressure.^[18]

Patients on peritoneal dialysis need to pay attention to their nutritional status and work closely with a dietitian who specializes in kidney disease. The dialysate solution contains glucose, which the body can absorb, adding extra calories. This can contribute to weight gain and may affect blood sugar levels, particularly in patients with diabetes. Adjusting the diet to account for these extra calories is important for maintaining a healthy weight and managing diabetes effectively.^[18]

Staying active and maintaining physical fitness is also encouraged. Peritoneal dialysis allows patients to remain more mobile and engaged in daily activities compared to in-center hemodialysis, which requires multiple trips to a dialysis clinic each week. However, patients should discuss any exercise plans with their healthcare team to ensure they are safe and appropriate given their overall health condition.^[18]

Travel and Flexibility

One of the most appealing aspects of peritoneal dialysis is the ability to travel. Because the treatment can be performed anywhere that is clean, dry, and well-lit, patients can take their dialysis supplies with them on trips. Many patients arrange to have dialysis supplies shipped to their travel destination, or they coordinate with local dialysis centers to ensure they have access to the necessary materials. This flexibility allows patients to maintain a more normal lifestyle, attend family events, take vacations, and continue working or going to school without being tied to a dialysis clinic schedule.^[1][23]

Most common treatment methods

• Continuous ambulatory peritoneal dialysis (CAPD)
  • Manual exchanges performed three to five times per day without a machine
  • Each exchange takes about 30 minutes using gravity to fill and drain the abdomen
  • Patients can perform exchanges at home, work, or any clean, dry location
  • Allows freedom to move and carry out normal activities while dialysate is inside the body
• Automated peritoneal dialysis (APD or CCPD)
  • Uses an automated cycler machine to perform exchanges automatically
  • Typically done overnight while the patient sleeps, with three to five exchanges per session
  • Frees up daytime hours for work, school, and other activities
• Intermittent peritoneal dialysis (IPD)
  • Uses the same type of automated cycler as APD but requires longer treatment sessions
  • Less common and usually performed in a hospital setting
• Catheter placement surgery
  • A minor surgical procedure performed before dialysis begins
  • A soft, flexible catheter is placed into the abdomen a few weeks before treatment starts
  • Allows time for the surgical site to heal before the catheter is used
• Infection prevention measures
  • Strict hand washing before every exchange
  • Wearing a surgical mask during the procedure
  • Keeping supplies and the treatment area clean and dry
  • Regular monitoring of the catheter site for signs of infection

Treatment in Clinical Trials

While peritoneal dialysis is an established treatment, ongoing research and clinical trials continue to explore ways to improve the technique, reduce complications, and enhance patient outcomes. However, the provided sources do not contain specific information about experimental drugs, innovative molecules, or particular clinical trials currently testing new therapies for peritoneal dialysis. Research in this area generally focuses on improving dialysate solutions, developing better catheter materials to reduce infection risk, and finding ways to optimize the dialysis prescription for individual patients. Additionally, studies are examining ways to prevent peritonitis and other complications, as well as strategies to improve the long-term effectiveness of the peritoneal membrane as a filter.

Patients interested in participating in clinical trials related to kidney disease and dialysis can discuss options with their healthcare team. Clinical trials offer access to cutting-edge treatments and contribute to advancing medical knowledge that can benefit future patients.