Which precardiac diseases are treated well? Most of the precordial diseases are treated well, such as atrial septal defect, ventricular septal defect, patent ductus arteriosus, mild to moderate pulmonary valve stenosis, right ventricular double chamber heart, triple atrial heart, partial type of pulmonary vein ectopic drainage, simple type of supra-aortic stenosis, aortic constriction, etc. The success rate of surgery for these diseases is high and the mortality rate has been close to zero in the best cardiac specialty hospitals in China. The incidence of postoperative complications is low, and the long-term outcomes are mostly close to normal. Dr. Hua Zhongdong, Department of Pediatric Cardiac Surgery, Fu Wai Hospital, Beijing, China This article is authorized by Dr. Hua Zhongdong.