By echo study that shows right to left shunt. Catheterization for assessment of the pulmonary artery pressure if its two thirds of systemic pressure this will preclude repair of the defects.
Eisenmenger's syndrome
Tetralogy of Fallot  Tetralogy of Fallot  1
Foville's syndrome
Lown–Ganong–Levine syndrome
Claude's syndrome
Saal Greenstein syndrome
Mietens syndrome
Löffler's syndrome