Nephrology focuses on diagnosing and treating kidney diseases. The kidneys filter waste, balance fluids, regulate blood pressure, and manage acute and chronic conditions.
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Renal replacement therapy is not a one-time event; it is an ongoing lifestyle. The treatment phase involves selecting and implementing the chosen method of replacement, while follow-up ensures that the treatment is working effectively and that the patient remains healthy. The three primary paths—hemodialysis, peritoneal dialysis, and transplantation—operate on very different schedules and mechanisms.
Regardless of the method chosen, the goal remains the same: to clean the blood and maintain chemical balance. This section dives deep into the mechanics of these treatments, explaining what happens during a session, how surgeries are performed, and what the long-term management looks like. It is a guide to the practical reality of living with a kidney replacement.
Hemodialysis is the most common form of treatment. It uses a machine to filter waste and water from the blood.
Before hemodialysis can start, a surgeon must create a permanent access point in the bloodstream. The best type is an arteriovenous fistula, usually created in the arm by connecting an artery to a vein. This makes the vein grow larger and stronger, allowing needles to be inserted easily. If a fistula cannot be made, a graft (a plastic tube) or a catheter (a tube in the neck) may be used.
During a session, two needles are placed in the access. One pulls blood out to the machine, and the other returns cleaned blood to the body. Inside the machine, the blood passes through a dialyzer, a filter made of thousands of hollow fibers. A cleaning fluid called dialysate washes over these fibers, pulling toxins out of the blood. The process typically takes four hours and is done three times a week at a clinic. Some patients can also learn to do the procedure at home.
Peritoneal dialysis offers more freedom but requires daily responsibility. It uses the peritoneum, the membrane lining the abdominal cavity, as a filter.
A soft plastic tube (catheter) is surgically placed in the belly. To perform a treatment, the patient connects a bag of cleaning solution to the tube and fills their abdomen with fluid. This fluid dwells inside for several hours, absorbing waste and water from the tiny blood vessels in the peritoneum. The patient then drains the dirty fluid out and replaces it with fresh fluid. This process is called an exchange.
Patients can perform manual exchanges throughout the day (Continuous Ambulatory Peritoneal Dialysis) or use a machine called a cycler to perform exchanges automatically while they sleep (Automated Peritoneal Dialysis). This allows many patients to work or go to school during the day without interruption.
A kidney transplant involves placing a healthy kidney from another person into the patient’s body. It is considered the best treatment because it restores normal kidney function better than dialysis.
The surgeon places the new kidney in the lower abdomen, usually without removing the failed kidneys unless they are causing problems. The artery and vein of the new kidney are connected to the patient’s blood vessels, and the ureter is connected to the bladder. The surgery usually takes a few hours, and the hospital stay lasts a few days.
Kidneys can come from a deceased organ donor or a living donor, such as a family member or friend. Living donor kidneys generally last longer and start working immediately. Deceased donor kidneys are allocated through a national waiting list based on compatibility and waiting time.
For some elderly or very frail patients, the burdens of dialysis may outweigh the benefits. In these cases, conservative management is an option.
This approach focuses on treating the symptoms of kidney failure with medication and a diet, without using dialysis machines. The goal is to maximize quality of life, comfort, and time at home. It is a valid and compassionate form of renal replacement care that focuses on the person rather than the numbers.
All forms of renal replacement require medications.
Monitoring is constant. Dialysis patients see their care team at least once a month, but often more frequently.
Blood is drawn monthly to check “adequacy,” which measures how well the dialysis is cleaning the blood. Doctors adjust the treatment time, the dialysate strength, or the medication dosage based on these numbers. Transplant patients have very frequent labs initially—sometimes twice a week—which space out over time as the kidney stabilizes. These checks ensure that the replacement therapy is efficient and that complications like infection or rejection are caught early.
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There is a pinch when the needles go in, similar to a blood draw. Once the needles are in place, the treatment itself is painless. Numbing creams can help reduce the pinch.
Yes. Peritoneal dialysis patients can bring their supplies with them. Hemodialysis patients can arrange treatments at clinics in their destination city, but it requires advance planning.
On average, a kidney from a living donor lasts 15 to 20 years, while one from a deceased donor lasts 10 to 15 years. Some last much longer.
Rejection is often treatable with strong medication. If the kidney fails completely, you can return to dialysis and potentially wait for another transplant.
The diet is much less restrictive than dialysis, but you still need to eat healthy to protect the new kidney and manage weight gain from medications.
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