title: Change in the splitting of the second heart sound after operation of atrial septal defects.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D006326:Heart Auscultation; D006344:Heart Septal Defects, Atrial / Q000503:physiopathology / Q000601:surgery*; D006439:Hemodynamics; D006801:Humans; D008875:Middle Aged; D010701:Phonocardiography; D011183:Postoperative Complications / Q000503:physiopathology