title: Transcatheter closure of atrial septal defects within the oval fossa: medium-term results in children using the 'ASDOS'-technique.
abstract: OBJECTIVE
  The purpose of this study was to evaluate the safety and efficacy of the ASDOS-technique (Sulzer-Osypka GmbH, Germany) for transcatheter closure of atrial septal defects within the oval fossa.
  
  
  BACKGROUND
  Although several attempts have been made to occlude defects within the oval fossa by transcatheter techniques, none of these has gained general acceptance.
  
  
  METHODS
  Patients with a defect in the oval fossa measuring equal to or less than 20 mm diameter, with a residual septal rim of 5 mm or greater, body weight greater than 10 kg, with clinical indications for surgical closure were considered for transcatheter closure. Follow-up investigations were performed at discharge, after 1, 3, 6 and 9 months, as well as after 1 and 2 years.
  
  
  RESULTS
  Of 78 patients considered for closure, a device was inserted in 41 patients (53%), with success being achieved in 40 patients (98%). The ages ranged from 1.1 to 15 years (7.8 +/- 1.92 years), the 'stretched' diameter of the defect from 10 to 20 mm (14.7 +/- 2.60 mm), and the diameters of the inserted devices from 25 to 45 mm (33.2 +/- 5.43 mm). Transient impairment of atrioventricular conduction occured in 4 patients. During the follow-up of 23.0 +/- 5.6 months elective surgical closure of a residual shunt was performed 26 months after insertion of the device in one patient. None of the other patients required surgery, hospitalisation or medical treatment, and none is requiring further treatment of the defect within the oval fossa. Fracture of one arm of the device occurred in 4 patients, but the fractured arms are in an unchanged and stable position after a period of at least 19 months.
  
  
  CONCLUSIONS
  Our medium-term data show that transcatheter closure in children of defects within the oval fossa can be performed with a high efficacy and safety using the ASDOS-device.
authors.affiliation: Department of Pediatric Cardiology of the Medizinische Hochschule Hannover, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Hausdorf
authors.forename: M
authors.initials: M
authors.lastname: Schneider
authors.forename: C
authors.initials: C
authors.lastname: Fink
authors.forename: U
authors.initials: U
authors.lastname: Neudorf
authors.forename: G
authors.initials: G
authors.lastname: Fischer
authors.forename: M
authors.initials: M
authors.lastname: Tynan
authors.forename: B
authors.initials: B
authors.lastname: Friedli
mesh_terms: D000293:Adolescent; D006328:Cardiac Catheterization / Q000379:methods; D006348:Cardiac Surgical Procedures / Q000295:instrumentation / Q000379:methods*; D002648:Child; D002675:Child, Preschool; D017548:Echocardiography, Transesophageal; D005260:Female; D006344:Heart Septal Defects, Atrial / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D007223:Infant; D008297:Male; D016896:Treatment Outcome