What type of surgery fixes two holes in the wall separating the upper two chambers of the heart?

ASD. You are describing Atrial Septal Deffect. Depending on size and location as well as volume of shunting blood and pressure in the pulmonary circulation, it may require: Nothing or a device placed in the heart from the vein of the legs or full blown cardiac surgery. All procedures are of relative small risk in an otherwise healthy patient.