title: Transcatheter closure of secundum atrial septal defects with the new self-centering Amplatzer Septal Occluder.
abstract: OBJECTIVE
  The study was set up to find out whether a new self-centering prosthesis for transcatheter closure of secundum atrial septal defects could overcome the disadvantages of previously described devices.
  
  
  RESULTS
  Fifty-two consecutive patients with a significant atrial septal defect were considered for transcatheter closure with the Amplatzer Septal Occluder. The device, made of a Nitinol and polyester fabric mesh, provides a different approach to defect occlusion by stenting the atrial septal defect up to a stretched diameter of 26 mm. Three infants whose large defects were demonstrated on a transthoracic echocardiogram were excluded from transcatheter treatment. On transoesophageal echocardiography, 49 defects ranged from 6-26 mm, in one adult the defect measured 28 mm and this patient was excluded from attempted transcatheter closure. At cardiac catheterization in five further patients, devices were not implanted, in two because the stretched diameter exceeded 26 mm and in three the device was withdrawn because it was unstable or compromised the mitral valve. Thus, device closure was performed in 43 patients. At follow-up after 3 months the complete closure rate was 97%.
  
  
  CONCLUSIONS
  The self-centering Amplatzer Septal Occluder is very efficient and user-friendly and offers interventional closure in 83% of an unselected group of patients presented with an atrial septal defect.
authors.affiliation: Department of Pediatric Cardiology and Biomedical Engineering, Christian-Albrechts-University of Kiel, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Fischer
authors.forename: H H
authors.initials: HH
authors.lastname: Kramer
authors.forename: J
authors.initials: J
authors.lastname: Stieh
authors.forename: P
authors.initials: P
authors.lastname: Harding
authors.forename: O
authors.initials: O
authors.lastname: Jung
mesh_terms: D000293:Adolescent; D000328:Adult; D000497:Alloys; D001835:Body Weight; D006328:Cardiac Catheterization; D006348:Cardiac Surgical Procedures / Q000295:instrumentation*; D002648:Child; D002675:Child, Preschool; D018618:Echocardiography, Doppler, Color; D017548:Echocardiography, Transesophageal; D004867:Equipment Design; D005500:Follow-Up Studies; D006344:Heart Septal Defects, Atrial / Q000000981:diagnostic imaging / Q000601:surgery*; D006801:Humans; D007223:Infant; D013902:Radiography, Thoracic; D015607:Stents; D013526:Surgical Mesh; D016896:Treatment Outcome
chemical_list: D000497:Alloys; C013616:nitinol