Introduction to hemodialysis


The urinary tract consists of the kidneys, ureters, urinary bladder and urethra. The kidneys are two twin organs located in the middle of the back above the waist.

The main functions of the kidneys are:

  • Eliminate toxins from the body from the blood
  • Adjust the amount of water and electrolytes
  • Contribute to the control of TA
  • Control the metabolism of calcium and phosphorus, and vitamin D.
  • They produce hormones such as erythropoietin

When the kidneys stop working completely or partially we say that the person is in Kidney failure. If it persists over time and is not considered reversible, we speak of chronic renal failure.


Hemodialysis is a renal replacement therapy that aims to supplement the function of the kidneys. It consists in drawing the blood from the body through a vascular access and transferring it to a dialysis or filter, through which the blood passes through one of the compartments and the other by the dialysis fluid, separated by a semipermeable membrane.