Ventricular septal defect is a common congenital heart disease, mainly due to the abnormal defect in the ventricular septum during the fetal development, resulting in an abnormal channel between the left and right ventricles. Ventricular septal defect can cause blood to shunt from the left ventricle to the right ventricle, gradually increasing the blood flow in the pulmonary circulation, leading to an increase in the volume load of the left and right ventricles, while causing a decrease in the systemic circulation volume. In the later stages, due to the significant increase in right ventricular pressure, it leads to right-to-left shunting, thereby causing Eisenmenger's syndrome. For ventricular septal defects with a large degree of defect, timely interventional treatment or surgical ventricular septal defect repair is required.