As they report in the International Journal of Cardiology, the researchers found that the patients given the caffeinated energy drinks had increased blood pressure levels and that a portion of patients also had prolonged QT intervals, which could led to dangerously irregular heartbeats.

Long QT syndrome (LQTS) is a congenital disorder characterized by a prolongation of the QT interval on electrocardiograms (ECGs) and a propensity to ventricular tachyarrhythmias, which may lead to syncope, cardiac arrest…