Ductal anatomy: a determinant of successful stenting in hypoplastic left heart syndrome.

Interventional palliation for hypoplastic left heart syndrome (HLHS) could reduce the current morbidity and mortality. Stenting of the arterial duct is the critical interventional step for HLHS. We reviewed our experience with 40 consecutive patients with HLHS referred for stenting of the ductus arterious (DA). Thirty-nine of 40 (97%) infants had suitable anatomy and were successfully stented. The infants were grouped by orientation of the ductus in the frontal plane. Type 1 DA anatomy had a leftward loop at a mean orientation of 18 degrees from the vertical plane. Type 2 ductal anatomy was mesoverted, with a mean orientation of 7.1 degrees from the vertical plane. Type 3 ductal anatomy displayed a rightward axis, with a mean of -4 degrees rightward. Orientation of the DA was significantly related to length of the ductus, number of stents required for complete coverage, and technical and procedural complications. Type 1 DA occurred in 65% of patients, and there was 100% technical success, no mortality, and only an 8% incidence of complications. Type 2 anatomy occurred in 27% of patients and there was 100% success. However, the technical and procedural complications increased to approximately 50%. Type 3 ductal anatomy was seen in only 3 patients, 2 of whom were successfully stented. There was no procedural-related mortality, and all stented patients were weaned from prostaglandin. There were only two late complications (coarctation). We conclude that ductal stenting using self-expanding nitinol stents is successful in more than 95% of infants with HLHS. Patients with HLHS and favorable ductal anatomy should be considered for primary ductal stenting.