Balloon atrial septostomy through azygos vein in two cases of D-TGA with left atrial isomerism.

Balloon atrial septostomy is a palliative procedure that is performed in D-transposition of great arteries when surgery is not immediately available. Although D-TGA and left isomerism association are rare, it is an important condition as the BAS procedure approach is unique. In this case report, we present two cases of D-TGA with left isomerism where BAS was performed due to restrictive atrial septal defect and lack of immediate availability of the paediatric cardiac surgeon.