Prolongation of the QT interval

In recent years in clinical cardiology, the problem of prolonging the QT interval has attracted close attention of domestic and foreign researchers as a factor leading to sudden death. It has been established that both congenital and acquired forms of QT interval prolongation are predictors of fatal rhythm disturbances, which, in turn, lead to sudden death of patients.

The QT prolongation syndrome is a combination of an extended QT interval of the standard ECG and life-threatening polymorphic ventricular tachycardia (torsade de pointes). Paroxysms of ventricular tachycardias such as pirouettes are clinically manifested in the form of episodes of loss of consciousness and often end with fibrillation of the ventricles, which are dopartic to sudden death.

The duration of the QT interval depends on the heart rate and the patient's sex. Therefore, use is not absolute, but the corrected QT interval (QTc), which depends on the heart rate, and also on the pacemaker.

The original article is published on the site of breast cancer (Russian Medical Journal): https://www.rmj.ru/articles/kardiologiya/Udlinenie_intervala_QT/#ixzz5L3M5IIcL Follow us: rusmedjournal on Facebook