2212 cases of closed transventricular mitral commissurotomy performed between dates of January 1,1970 and December 29,1979 have been analyzed. Especially in recent years, despite great progress in extracorporeal circulation techniques, giving advantages and safety, closed mitral commissurotomy is still an applicable method for pure mitral stenosis in suitable cases. Development of postoperative complications could be minimized or avoidid completely by the meticulous application of closed mitral commissurotomy technique by skilled hands, in well sleeted patients. An average of 5 years palliation and even clinical improvements with a duration of 10 to 15 years or more can be achieved by the closed mitral commissurotomy technique which has been applied for many years.