The observed rates of residual patency were similar to those found after surgical ligation.
The second problem is residual patency after implantation.
For very young children, the internal thoracic artery should be used as the graft of choice, expecting long-term patency.
Since the development of transcatheter methods of closing ducts, pediatric cardiologists have led the way in being critical in the evaluation of residual patency.
The long term success depends on the continued patency of the coronary arteries and on preservation of left ventricular function.
Its long-term patency, however, remains unknown and should be assessed as the next step in clinical evaluation.
Patency at 6 mos = 97%, 1y = 95%, 2y = 89%. 4mm patency and adequate palliation < 5mm and 6mm shunts.
In these cases, depending on the cardiac defect, either the pulmonary or systemic circulation is dependent on the patency of the arterial duct.
