title: Transcatheter occlusion of patent ductus arteriosus using tornado platinum coils.
abstract: BACKGROUND
  The purpose of the present study was to develop a method to occlude a patent ductus arteriosus (PDA) using a tornado platinum coil, which is compatible with magnetic fields.
  
  
  METHODS
  Twelve patients with a PDA (5 boys and 7 girls; 0.6 to 7 yrs; 6.5 to 22.1 kg) were enrolled. The minimum size of the PDA ranged from 0.2 mm to 3.6 mm. Either the anterograde or retrograde method was applied using a retrievable system that consisted of a 5-Fr multipurpose catheter and a 3-Fr bioptome. Three to 3.5 loops of the larger end of a tornado platinum coil were placed in the aortic ampulla and the remaining 0.5-1.0 loop of the smaller end of the coil was placed in the main pulmonary artery.
  
  
  RESULTS
  In 11 patients with minimum size of PDA </= 2.8 mm, the PDA was successfully occluded using one to five tornado platinum coils and, in 10 of 11 patients, an echocardiogram confirmed complete occlusion up to 6 months after the procedures. In the remaining patient with a relatively large PDA (3.6 mm), the PDA could not be occluded because of instability of the coils.
  
  
  CONCLUSIONS
  It is feasible to occlude a relatively small PDA (</= 2.8 mm) using tornado platinum coils, but further study is warranted to evaluate the safety and efficacy of this method.
authors.affiliation: Division of Pediatric Cardiology, Department of Pediatrics, Tenri Hospital, Tenri City, Japan. kensuda@kcn.ne.jp
authors.forename: Kenji
authors.initials: K
authors.lastname: Suda
authors.forename: Masahiko
authors.initials: M
authors.lastname: Matsumura
mesh_terms: D002648:Child; D002675:Child, Preschool; D004374:Ductus Arteriosus, Patent / Q000628:therapy*; D004621:Embolization, Therapeutic / Q000295:instrumentation*; D005240:Feasibility Studies; D005260:Female; D005471:Fluoroscopy; D006801:Humans; D007223:Infant; D008297:Male; D010984:Platinum; D019736:Prostheses and Implants
chemical_list: D010984:Platinum