Abstract:Objective To summarize the surgical treatment of complete atrioventricular septal defect (CAVSD). Methods From April 2013 to April 2018, 74 patients with complete atrioventricular septal defect (CAVSD) were treated. All patients underwent atrioventricular valvuloplasty with repairation of deformity during the operation. Results Among the 74 CAVSD patients, there were 11 patients with single tablet method, 28 patients with double tablet method and 35 patients with improved single tablet method. The pairwise comparison of the three surgical methods showed that there were significant differences in block time, mechanical ventilation time, and ICU stay time between the modified single-slice method and the double-slice method (P?0.05). The time of all three variables was shorter than that of the double-slice method (P?0.05). 2 patients died early after operation, and the mortality rate was 2.7%. The cause of death: one case had multiple organ failure due to young age and low body weight; one had arrhythmia, and low cardiac output syndrome due to poor valvuloplasty; the rest of the children were discharged smoothly. 72 patients were followed up from 4 to 33 months. The mid-term follow-up showed 13 cases of mild mitral regurgitation, 4 cases of mild to moderate reflux, and 3 cases of residual vertebral VSD of 1 to 2 mm. Conclusion Patients with complete atrioventricular septal defect emerge early, and should be diagnosed and treated early. Individualized surgical plan is able to improve the surgical results. The key to successful surgery is to properly repair the atrioventricular valve, pay attention to intraoperative atrioventricular block and postoperative pulmonary hypertension crisis.