All issues > Volume 40(3); 1997

Original Article

J Korean Pediatr Soc. 1997;40(3):343-351. Published online March 15, 1997.

Experience of Stent Implantation in Branch Pulmonary Artery Stenosis of the Congenital Heart Diseas

Yong Soo YS Yun¹, Eun Jung EJ Cheon¹, Ho Sung HS Kim¹, Chung Il CI Noh¹, Jung Yun JY Choi¹

¹Department of Pediatrics, College of Medicine, Seoul National University, Seoul, Korea

Abstract

Purpose
: Branch pulmonary artery stenosis remains a clinically challenging lesion.
Results
of surgical angioplasty are rarely rewarding, and balloon angioplasty is not uniformly successful. So, endovascular stent has been applied recently to these lesions. But this new modality has not been full yevaluated. The aim of this study is to evaluate the short-term result of stent implantation in postoperative branch pulmonary artery stenosis.
Methods
: In selected 17 children with postoperative branch pulmonary artery stenosis, balloon-expandable stent implantation were attempted between Aug.1993 and Feb.1996. They all had Tetralogy of Fallot except one with ventricular septal defect and pulmonary atresia and had been underwent total correction. For assessment of results of stent implantation,intraluminal diameter ratio(LPA/RPA) and pressure gradient across the narrowest point were measured, and radionuclide lung perfusion scan was done before and after the procedure.
Results
: Fifteen stents were successfully implanted in each 15 children, aged 3.4 years to 12.7 years. The average ratio of vesseldiameter (LPA/RPA) on angiogam increased from 0.49¡¾0.15 to 0.96¡¾0.18, pulmonary perfusion fraction from 25.6¡¾6.1 to 38.9¡¾9.9% and pressure gradients from 19.0¡¾8.5mmHg to 7.4¡¾6.0mmHg with stent placement. All changes were statistically significant. There were no fever,transfusion requirement, femoral artery thrombosis, and transient bradycardia during the procedure. Implantation failure was two cases. Failure was due to displacement of stent to distal pulmonary artery.
Conclusion
: Success rate of stent implantation is 88%. Effective relief of stenosis is accomplished in 93%. Stent implantation is effective and safe modality for postoperative branch pulmonary artery stenosis in short-term follow-up.

Keywords :Branch pulmonary artery stenosis, Stent, Tetralogy of Fallot