Small atrial septal defect associated with physiologic splitting of the second heart sound. Difficulty in diagnosis without cardiac catheterization.
D000293:Adolescent; D006328:Cardiac Catheterization; D002648:Child; D004562:Electrocardiography; D005260:Female; D006344:Heart Septal Defects, Atrial / Q000175:diagnosis* / Q000503:physiopathology; D006801:Humans; D008297:Male; D010701:Phonocardiography; D013997:Time Factors