This retrospective study aimed to review the clinical features and management of patients with secundum atrial septal defect (ASD 2 degree). The subjects studied were 90 boys (39.8 percent) and 136 girls (60.2 percent), treated at the Outpatient Clinic, Cardiology Division, Department of Child Health, Cipto Mangunkusumo Hospital, Jakarta, Indonesia, from January 1, 1983 to December 31, 1992. Cl…