QT interval extended

QT prolongationsyndrome refers to a group of syndromes with prolonged QT interval on the electrocardiogram, ventricular arrhythmias, syncope, and sudden death, and may be accompanied by congenital deafness. Many of the symptoms are familial, and those with deafness were first described by Jervell and Lange-Nielsen, so they are also called Jarlan syndrome; those without deafness are also called Ward- Romano) syndrome. Those with familial inheritance are autosomal recessive. But in recent years, it is believed that the disease may be a chronic viral infection or some non-infectious degeneration (mainly poisoning), not just a genetic disease. This chronic viral infection can be transmitted from mother to child or from siblings.