Dialysis Explained: Types, Benefits, Risks, and What to Expect

The kidneys continuously cleanse the bloodstream by removing waste products and excess fluid, which are then eliminated in the urine. When kidney function falls below 10‑15% due to disease or injury, dialysis becomes a vital bridge that mimics the kidneys’ filtering role.

Dialysis can prevent the buildup of salts, toxins, and fluid that would otherwise damage other organs. Below you’ll find a clear overview of the three main dialysis modalities, their preparation steps, typical session details, and potential complications.

Hemodialysis

Hemodialysis uses a medical device called a hemodialyzer to clean the blood outside the body.

Preparing for Hemodialysis

A vascular surgeon creates a durable access point—usually an arteriovenial (AV) fistula, an AV graft, or a temporary vascular catheter. The access is created weeks to months before treatment to allow proper healing.

• AV fistula – the patient’s artery and vein are joined, offering the longest‑lasting access.
• AV graft – a synthetic tube connects artery to vein, used when vessels are unsuitable for a fistula.
• Vascular catheter – a short‑term option for urgent or intermittent dialysis.

During Hemodialysis

Blood is drawn from the body, passed through the hemodialyzer where waste and excess fluid are removed, then returned via a dialysis machine. A typical session lasts about four hours and is performed three times per week, though shorter, more frequent schedules are possible based on body size, waste load, and overall health.

After Hemodialysis

Many patients transition to home‑based hemodialysis after mastering the technique in a clinic. Home treatment offers flexibility but still requires regular monitoring by a nephrologist and a trained partner or nurse.

Peritoneal Dialysis (PD)

Peritoneal dialysis uses the lining of the abdomen (the peritoneum) as a natural filter.

Preparing for Peritoneal Dialysis

A surgeon implants a soft PD catheter into the abdomen about three weeks before the first exchange. Patients then receive hands‑on training from a dialysis nurse to manage the catheter site and perform fluid exchanges safely.

During Peritoneal Dialysis

Dialysate, a sterile glucose‑based solution, is infused into the peritoneal cavity. Waste and excess fluid diffuse across the peritoneal membrane into the dialysate, which is later drained. Exchanges are repeated 3‑5 times daily and can be performed while awake or sleeping.

PD comes in three formats:

• Continuous Ambulatory Peritoneal Dialysis (CAPD): Manual fills and drains performed several times a day without a machine.
• Continuous Cycling Peritoneal Dialysis (CCPD): An automated cycler performs exchanges overnight while the patient sleeps.
• Intermittent Peritoneal Dialysis (IPD): Longer, less frequent exchanges usually done in a hospital or at home with a cycler.

After Peritoneal Dialysis

Proper care of the catheter exit site and regular supply management are essential to prevent infection, especially peritonitis.

Continuous Renal Replacement Therapy (CRRT)

CRRT is a slow, continuous form of dialysis used primarily in intensive‑care units for patients with acute kidney injury. Often called hemofiltration, a machine circulates blood through a filter, removes waste and fluid, and returns the cleaned blood with replacement fluid. Treatments run 24 hours a day or longer.

Potential Risks

Hemodialysis

Complications can include vascular access infection, clotting, low blood pressure, and muscle cramps.

Peritoneal Dialysis

Risks focus on catheter‑related infections such as peritonitis, as well as abdominal discomfort and hernias.

CRRT

Risks involve bleeding, electrolyte imbalances, and equipment‑related complications.

Long‑term dialysis may also predispose patients to amyloidosis, depression, or anxiety. If you experience mood changes, reach out to your care team or consult resources such as the National Alliance on Mental Illness.

Alternative and Adjunct Therapies

When dialysis isn’t the preferred route, clinicians may manage anemia with weekly erythropoietin (EPO) injections, control blood pressure, and advise fluid‑intake strategies. Non‑steroidal anti‑inflammatory drugs (e.g., ibuprofen, diclofenac) should be used only under medical guidance.

A kidney transplant remains the definitive treatment for many patients. Eligibility factors include smoking status, alcohol use, obesity, and untreated mental‑health conditions.

Practical Tips for Dialysis Patients

• Fast as instructed before procedures.
• Wear loose, comfortable clothing during treatment.
• Hemodialysis often requires a partner; peritoneal dialysis can be performed independently.
• Follow a renal‑dietitian‑guided plan to limit potassium, phosphorus, sodium, and fluid intake.

Consistent dialysis helps maintain fluid and electrolyte balance, reduces the urgency for transplant, and improves overall quality of life.

Considering Stopping Dialysis

If you contemplate discontinuing treatment, discuss your concerns with a nephrologist and mental‑health professional. Stopping dialysis without an alternative kidney‑function restoration will ultimately lead to fatal complications.

Dialysis is a life‑sustaining therapy that can bridge acute kidney injury, chronic kidney disease, or other renal disorders. Always weigh the benefits, risks, and personal preferences with your healthcare team.