title: [Pre- and postoperative cardiac function using M-mode echocardiography in patients over 30 years of age with secundum atrial septal defect].
mesh_terms: D000328:Adult; D004452:Echocardiography; D004562:Electrocardiography; D006344:Heart Septal Defects, Atrial / Q000503:physiopathology* / Q000601:surgery; D006439:Hemodynamics; D006801:Humans; D008875:Middle Aged