balloonseptostomy

bal·loon·sep·tos·to·my

(bə-lōōn′sĕp-tŏs′tə-mē)
n.
The surgical creation of an artificial interatrial septal defect by cardiac catheterization during which an inflated balloon is pulled across the interatrial septum through the oval foramen.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.