“…In Japan, PTMC is now an established treatment for MS because of its good midterm prognosis. 2) However, unlike the reports on surgical mitral commissurotomy (i.e., closed mitral commissurotomy and open mitral commissurotomy), [3][4][5] even in Japan, those for PTMC have mostly been on midterm prognosis for around 10 years, 6,7) and only few have reported on the long-term prognosis after PTMC. In this study, we examined the long-term prognosis of PTMC for up to 20 years.…”