Percutaneous transvenous mitral commissurotomy (PTMC), also known as percutaneous mitral balloon valvotomy, has become the procedure of choice for patients with symptomatic severe mitral stenosis (MS) who have suitable mitral valve (MV) morphology on echocardiography. The principle of PTMC is that when a fluid filled balloon is expanded, equal pressure is applied to the MV, resulting in separation along the plane of least resistance, which are the commissures. PTMC can also be considered in patients with asymptomatic MS, with significant hemodynamic changes and has a suitable MV morphology on echo.
