Atrial septal defect.
D000368:Aged; D001281:Atrial Fibrillation / Q000209:etiology / Q000601:surgery*; D001282:Atrial Flutter / Q000209:etiology / Q000601:surgery; D006344:Heart Septal Defects, Atrial / Q000150:complications / Q000601:surgery*; D006801:Humans; D008875:Middle Aged; D011183:Postoperative Complications