3 surgies needed to fix.
The first surgery, called the Norwood operation, occurs within the first few days of life. Stage I of the Norwood procedure consists of building a new aorta, and an artificial shunt is inserted to maintain blood flow to the lungs.
Stage II of the operation is called the Glenn shunt or Hemifontan procedure. This procedure connects half of the veins carrying blue blood from the body (the superior vena cava) directly to blood vessels to the lungs to get oxygen. The surgery is usually done when the child is 4 - 6 months of age.
Stage III, the final step, is called the Fontan procedure. The remainder of the veins carrying blue blood from the body (the inferior vena cava) is connected directly to the blood vessels to the lungs, and the right ventricle now serves as the only pumping chamber for the heart. This surgery is usually performed between the ages of 18 months and 3 years of age. After this final step, the baby is no longer blue (cyanotic).
Some patients may need more surgeries in their 20s or 30s if they develop hard to control arrhythmias or other complications of the Fontan procedure" (via site)
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