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Clinical Detection of Hemodynamically Significant Isolated Secundum Atrial Septal Defect. The diagnosis of secundum atrial septal defect often is delayed. For 310 patients with hemodynamically significant secundum atrial septal defect undergoing closure over a 5-year period at a single medical center, this study reviews the symptoms prompting referral, limitations of physical examination and electrocardiography, and basis for initially missing the diagnosis.