[Reoperation for complications of mitral valve surgery].

Among the early postoperative complications of mitral valve surgery. Mitral Regurgitation (MR) is one of the most dangerous complications, which has to be diagnosed and to be treated as early as possible. Four reoperations-two of which are of paraprosthetic regurgitation, and two of recurrent MR after mitral valve plasty-are reported. Their clinical courses and transesophageal echocardiographic findings are shown. And the differences their MR has when it is compared with the physiologic MR of the prosthetic valve and with the acceptable MR after mitral valve plasty are described.