Inclusion Criteria:  ·Participants with the diagnosis of TGA or TBA underwent ASO.  Exclusion Criteria:  Patients with various forms of TGA undergoing Réparation à l'Etage Ventriculaire procedure Patients with various forms of TGA undergoing Rastelli procedure Patients with various forms of TGA undergoing Nikaidoh procedure Patients with various forms of TGA undergoing Fontan operation Patients with various forms of TGA undergoing atrial repair (Mustard or Senning) operations ASO is used as a corrective therapy for prior operations.