[Studies on EKG changes before and after cardiac surgery. 2. Atrial septal defect].
D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D004562:Electrocardiography; D005260:Female; D005500:Follow-Up Studies; D006344:Heart Septal Defects, Atrial / Q000601:surgery*; D006801:Humans; D008297:Male