Enormous Enlargement of Right Atrium Occurred Late After Surgical Dilation of Pulmonary Valve Stenosis: Case Report.

Congenital pulmonary valve stenosis is a relatively common congenital defect, often related to abnormal development and fusion of pulmonary valves. Critical pulmonary valve stenosis should be treated, early in life, before dilation of right chambers, and occurrence of arrhythmias. We report one case of enormous enlargement of right atrium revealed by typical atrial flutter which occurred very late, in 48-year-old man, who underwent surgical dilation of pulmonary valve stenosis at eleven years old, but without repairing dilated tricuspid annulus. Despite successfully ablation of atrial flutter in our cathlab, the patient developed atrial fibrillation, because of an enormous enlargement of right atrium and massive tricuspid regurgitation.