Q—T 间期延长综合征(简称:LQTS)并非罕见,近年来,各国报道有增加的趋势,且有很高的猝死率。同时,由于本病有短暂性晕厥发作,易误诊为神经官能症、癫痫小发作和某些离子紊乱,而造成严重的后果。因此,对本病的早期确诊,实属必要。本病诊断的基本条件,主要靠心电图。但不同患者或同一患者的不同时期,心电图差异很大,易给诊断造成困难。因此,对本综合征的心电图改变,提高认识,以便及早做出明确诊断,积极治疗,是防止猝死的重要环节。故根据临床点滴实践结合文献复习, Q-T prolongation syndrome (LQTS) is not uncommon. In recent years, there is an increasing trend in all countries and a high rate of sudden death. At the same time, because of the disease has a transient syncope attack, easily misdiagnosed as neurosis, epileptic seizures and some ion disorders, and cause serious consequences. Therefore, the early diagnosis of this disease, it is necessary. The basic conditions of this disease diagnosis, mainly by ECG. But different patients or the same patient in different periods, ECG is very different, easy to make diagnosis difficult. Therefore, the ECG changes in this syndrome, awareness, in order to make a clear diagnosis as soon as possible, active treatment, is an important part to prevent sudden death. Therefore, according to clinical drip practice combined with literature review,