Limitations
The study had several limitations that need to be considered while interpreting the results. First, this was a single institution study of a small group of patients over a short period of time. The number of cases who are diagnosed heterotaxy with extracardiac TAPVC in our hospital is decreasing; we performed the last case of this procedure in April 2020. Further studies are required to investigate the long-term outcomes in a larger number of patients. Second, we only evaluated the effect of the V-A angle and the anatomical relationship between the arch and apex on surgical outcomes. Thus, we cannot exclude the possibility of an incidental focal change in the PVs along the suture line as a cause of postoperative branch PVO.