摘要: Transcatheter Device closure for secundum ASD is the treatment of choice when patient has a good rims [1,2] and it an excellent shore long term results with minimal complications [3,4]. Rhythm disturbance one these uncommon [5-7]. We reported 4 years old boy that developed first second degree heart block few days after device large secondum spontaneous recovery week prednisolone. Kerwords Heart block; Atrial septal defect ASD;