A case report of an elderly male with isolated coronary sinus atrial septal defect.

Elderly patients with atrial arrhythmias might show uncommon presentations of congenital heart disease. Cardiologists should pay attention to enlarged right ventricle, pulmonary artery, and, in particular, enlarged coronary sinus. Direct closure with interrupted sutures secured with pledgets is effective in some case of terminal type of CSASD.