Cardiac safety evaluation is an important factor that must be investigated before various new drugs enter clinical trials, and it is also one of the most important and difficult links in the early clinical research of innovative drugs. The QT interval of the heart refers to the period from the beginning of the QRS complex to the end of the T wave, including the process of ventricular depolarization and repolarization. The QT interval is considered to be one of the key indicators for the safety evaluation of new drugs. In cardiomyocytes, the potassium channel encoded by hERG (human Ether-a-go-go Related Gene) mediates a delayed rectifier potassium current (IKr), and IKr inhibition is an important mechanism by which drugs lead to prolongation of the QT interval. hERG can be inhibited by compounds with diversified structures. The loss of its function or drug inhibition will affect the repolarization process of cardiac action potentials and cause the QT interval to prolong. At the same time, it can induce torsade de pointes ventricular tachycardia and cause arrhythmia.https://www.medicilon.com/services/drug-safety-evaluation/