To study the clinical manifestations and therapy of Chinese long QT syndrome (LQTS) patients. According to the criteria by Schwartz 1993, 76 patients who came from 18 provinces were diagnosed as LQTS.

• 为研究我国长QT综合征 (LQTS)患者的整体发病和治疗情况 ,选择按照 1993年Schwartz等提出的LQTS诊断标准确诊为本病的家系 76个。