Impact of Aortic Annular Size on Rate of Reoperation for Left Ventricular Outflow Tract Obstruction After Repair of Interrupted Aortic Arch and Ventricular Septal Defect

Neonatal single-stage repair for IAA/VSD achieves excellent survival. For the patients whose aortic annulus is greater than patient's weight (kg) + 1.5 mm, low reoperation rate for LVOTO is expected. For the patient whose aortic annulus is less than patient's weight + 1.5 mm, almost half of them needed reoperation. An LVOT bypass procedure (Yasui or Norwood) is recommended if the aortic annulus is less than the patient's weight + 1.0 mm.