title: Spontaneous closure of secundum atrial septal defect.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D006328:Cardiac Catheterization; D002648:Child; D002675:Child, Preschool; D004562:Electrocardiography; D005260:Female; D006337:Heart Murmurs; D006344:Heart Septal Defects, Atrial; D006801:Humans; D007223:Infant; D008297:Male; D012075:Remission, Spontaneous