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Backgound: The kidney is an essential organ in regulating the electrolyte balance. With the progression to advanced renal insufficiency, disturbances occur, with frequent increases in the level of potassium, which lead to a significant increase in morbidity and mortality in this group of patients, most commonly by cardiovascular complications - arrhythmias and sudden death. Since chronic renal failure has become a global problem and is frequently under-diagnosed, it is very important to have a correct diagnosis an...