What is the definition of commissurotomy?

Incision of valve: Commissurotomy of a cardiac valve is called a valvulotomy, and consists of making one or more incisions at the edges of the commissure formed between the two or three leaflets of the valves. This procedure is performed in order to relieve constrictions, which occurs in valvular stenosis, especially mitral valve stenosis.

Surgery : It is the cutting of the commissures - (the pathologically fused leaflets of the mitral valve as occurs in rheumatic heart disease) so that the leaflets are free to open and close normally.