The correct term for QTc interval prolongation would be Q-T interval syndrome, which may present with symptoms such as mild headache, convulsions, fainting and even sudden death.
Q-T interval syndrome, also known as repolarization delay syndrome, may be clinically caused by abnormal function of ion channel proteins and regulatory proteins in cardiomyocytes. It is a disease characterized by ventricular tachycardia, ventricular fibrillation, or ventricular arrest, and may cause mild dizziness, as well as symptoms such as convulsions, syncope, and even sudden death.
Clinically Q-T interval syndrome, the principle of treatment is to prevent syncope or sudden death due to arrhythmia, etc. The treatment includes life management, medication, and placement of artificial pacemakers and other treatment modalities.
When patients develop these symptoms, patients should seek prompt medical attention to improve their quality of life by improving cardiac function.