Limitations:
The single center and retrospective study design was our most important limitation. We started using the modified Wisconsin protocol in July 2018. In the previous period, we did not have a standard treatment protocol. Factors such as increased experience and better patient selection after this period might also have an impact on the results. In addition, although the number was small, performing IEC Fontan might cause heterogeneity. We believe that studies with more homogeneous and larger sample of patients are needed.