Abstract
Cardiotoxicity is a term that includes various undesirable cardiovascular events during chemotherapy in hematological cancer patients. Cardiotoxicity can occur both during chemotherapy and at different times after its completion. Its manifestations are diverse, it can proceed without symptoms and be registered only with instrumental and laboratory research, or be accompanied by a severe, sometimes life-threatening clinical picture. In clinical practice doctors, oncohematologists often face the manifestation of cardiac arrhythmias and its conduction disorders in patients. Acute drug toxicity may also develop resulting in drug-induced cardiac arrhythmias. This case report deals with a clinical case of a patient who underwent inpatient treatment of the underlying disease acute leukemia. During the treatment, multiple infectious complications arose. In the selection of treatment for these complications, medications of various groups were prescribed according to vital indications. This therapy, in turn, unfortunately, led to the clinical death of the patient. The cause could be drug-induced QT/QTc prolongation. A young man, who had no history of structural heart disease, became acutely ill, and during the treatment of the underlying disease (polychemotherapy) received side effects from drug groups that led to the patient’s clinical death.