Objective To discuss the change and significance of QT dispersion(QTd) before and after transcatheter closure in patients with ventricular septal defect(VSD).

• 目的通过观察经导管封堵室间隔缺损(VSD)前后QT离散度(QTd)的变化,探讨VSD封堵术对QTd的影响及意义。