IL6 and ventricular septal defect: To detect the expression of inflammatory factors such as interleukin-1β (IL-1β), interleukin-6 (IL-6), transforming growth factor (TGF-β), and tumor necrosis factor (TNF-α) in the tumor tissue of ventricular septal defect (VSD) in congenital heart disease and to explore the role of inflammatory response in the formation of aneurysmal perimembranous VSD(APVSD).