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How does dialysis work?

Dialysis removes waste and fluids from your body that your kidneys are not able to remove. Dialysis also aims to keep your body in balance by correcting the levels of various toxic substances in your blood. Without dialysis, all patients with complete kidney failure would die from the build up of toxins in the bloodstream.

Principles of dialysis

There are two main types of dialysis: haemodialysis and peritoneal dialysis. Whichever treatment is chosen, the aims of dialysis are very similar: dialysis is designed to replace several functions of the kidney. The therapy must: remove waste products, remove excess fluid and balance the amount of chemicals (electrolytes) and other substances in your body. Effective dialysis requires: a semipermeable membrane, blood supply, dialysis fluid and a method of removing excess fluid.

.Semipermeable membrane

In dialysis a semipermeable membrane separates the blood from the dialysis fluid. This membrane allows some substances to pass through, but not others. It allows waste products, water, electrolytes and other substances to be removed from the blood into the dialysis fluid (and sometimes in the other direction) by a process called diffusion. The movement of waste products and other substances is dependent on the membrane’s permeability, the size and structure of the various substances, the dialysis fluid makeup, and the blood supply to the membrane.

Blood supply

The better the blood supply to the membrane the more efficient the dialysis treatment. In haemodialysis blood supply can be controlled by the dialysis machine.

Dialysis fluid

In both dialysis modes the dialysis fluid enables waste products to be removed from the blood. In addition to this, it contains a range of substances which help to correct imbalances that occur as a result of kidney failure.

Fluid removal

Fluid removal is achieved by very different processes in haemodialysis versus peritoneal dialysis. In haemodialysis the dialysis machine uses pressure to pull fluid across the membrane from the blood and into the dialysis fluid. In peritoneal dialysis glucose is used in the dialysis fluid. This has the effect of encouraging excess fluid to move out of the blood and into the dialysis fluid to be periodically drained.

Aim of dialysis

Whichever dialysis treatment is used the aim is to: remove waste products, remove excess fluid, correct electrolyte imbalances and to correct the pH of the body.

Learn more about CKD - Diaverum´s Patient Education Program teaches you how!

Life is never easy. There are joyful moments – but there are also many challenges. Especially after being diagnosed with a chronic disease the world  can seem dark and cloudy.  

At Diaverum, our patients are at the centre of everything we do. We understand that being confronted with the life-changing diagnosis of chronic kidney disease (CKD) can really turn your world upside down. How will CKD affect your life and lifestyle? How can you continue to live a full life with CKD? Anxiety about the future is a quite natural and understandable reaction.

Living is an art. Understanding the impact of chronic kidney disease and learning as much as possible about life with CKD is key to making educated choices and maintaining the ability to lead an active life.

CKD patients are able to live a full life while being on treatment. Stay positive – there is only one life to live!

We help you to answer the most pressing questions. Log-in to Diaverum’s engaging e-learning platform and learn more about:

 It is only 3 steps to start your individual e-learning experience:

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Diaverum vision First choice in renal care Diaverum mission Improve quality of life for renal patients Our values Competent, inspiring, passionate Our services Depending on the location we offer in our centers hemodialysis, including ... [mehr]