[Two cases of atrial septal defect with absence of right superior vena cava and persistent left superior vena cava].

Two women (16-year-old, 54-year-old) of atrial septal defect with absence of right superior vena cava and persistent left superior vena cava were successfully operated on. Electrocardiographic findings show coronary sinus rhythm and atrial fibrillation. When we closed atrial septal defect cannulated to persistent left superior vena cava via the coronary sinus directly, sick sinus syndrome was not appeared postoperatively.