The intervention consists of transvenous balloon dilation of the subaortic region. We perform this technique under fluoroscopic guidance. The risk associated with this procedure is low but can result in sudden death due to rupture of the coronary arteries or ventricular tachyarrhythmias. Colorado State University offers surgical repair of these defects using cardiac bypass technology. We offer our clients referral to CSU if desired.
Pulmonic stenosis can be difficult to distinguish from subaortic stenosis based on auscultation.
The breed predisposition is different which can be a helpful clue. Bulldogs, Westies, Beagles, and Schnauzers are representative breeds. The interventional technique is essentially the same as for SAS-fluoroscopic guided balloon dilation of the affected region. Septal defects are more readily diagnosed based on auscultation. Most dogs with these defects live normal lives with no restrictions.