What is balloon atrial septostomy and in what condition is it used?

• A. A procedure to create or enlarge an atrial septal communication to improve systemic oxygenation in certain congenital heart defects (e.g., d-TGA) or in neonatal palliation.
• B. A technique to close atrial septal defects.
• C. A method to widen the ventricular septum.
• D. A device to occlude patent ductus arteriosus.

Answer: (D)

Balloon atrial septostomy creates or enlarges an opening between the atria to promote mixing of oxygenated and deoxygenated blood, which is crucial when the great arteries are transposed and there isn’t good systemic oxygenation. In newborns with dextro-transposition of the great arteries, the only way to improve systemic oxygen delivery before definitive repair is through atrial level mixing, achieved by tearing the atrial septum with a balloon catheter to enlarge the interatrial communication. This technique, sometimes performed as part of neonatal palliation, helps raise systemic oxygen saturation until surgical correction can be done. It is not used to close an atrial septal defect, nor to widen the ventricular septum, nor to occlude a patent ductus arteriosus.