[MODERN ASPECTS OF THE SAFE USE OF EXTENSION QT INTERVAL MEDICINES.]

Prolongation of QTinterval is apredictor offatal cardiac arrhythmias and sudden death. In clinical practice, medicines with possible and conditional risk of QTprolongation are combine. The danger of such interactions could be enhanced if medi- cines interact themselves at metabolic rate. The interaction of drugs with possible and conditional risk of QTprolongation and interaction of these drugs with drugs that can influence the metabolic activity of cytochrome P450 isoenzymes require specific attention from physicians. Predictability of QTprolongation by drug-drug interactions at metabolic rate in drug administration will increase the safety of pharmacotherapy of drugs with possible and conditional risk of QTprolongation.