[Two cases of hypertrophic obstructive cardiomyopathy (HOCM) treated with mitral valve replacement].

The first patient was a 60-year-old female who had suffered from several episodes of cardiac failure due to severe mitral regurgitation and HOCM. The patient underwent urgent MVR because she had cardiac tamponade due to left ventricular perforation during cardiac catheterization. The second patient was a 64-year-old female with a history of several cardiac failures. The patient had an operation because she had been symptomatic under medical treatments. She underwent MVR instead of myectomy due to relatively thin ventricular septum. Both of them are doing well after the operations in NYHA class I. Although myotomy and myectomy are preferable procedure for HOCM as a first choice, MVR should be considered for the patients who have severe mitral valve regurgitation or the thin interventricular septum.