Between 1973 and 1981 a total of 38 patients with a adult Patent Ductus Arteriosus, resulting from a congenital heart disease. There were 10 males and 28 females and most were in their twenties. In 21 cases, typical Patent Ductus Arteriosus without pulmonary hypertension and in 17, atypical Patent Ductus Arteriosus with pulmonary hypertension were noted. Methods of surgical treatment were division, double ligation, triple ligation, or wrapping with Teflon felt and ligation. The number of patients for each surgical treatment were 23 cases with double ligation, 4 cases with triple ligation, 3 cases of wrapping with Teflon felt and ligation and 8 cases with division. Surgical mortality occurred in one case[2.6%]. [KTCS 1982;3:311-315]