Final answer:
A valvotomy is the procedure that involves making an incision in a valve to increase the opening size, in contrast to an angioplasty which uses a balloon to open narrowed vessels and may involve stent placement.
Step-by-step explanation:
The procedure that involves the incision of a valve to increase the size of an opening is called a valvotomy. Unlike angioplasty, which is a procedure to mechanically widen an occluded vessel using a balloon catheter and possibly inserting a stent, a valvotomy specifically targets the valves within the heart. During the valvotomy procedure, a surgical incision is made into the valve, often to treat stenosis (narrowing of the valve). This is distinct from other procedures such as valvectomy (removal of a valve), valvuloplasty (repair of valve tissue), valvorrhaphy (suturing of a valve), and valvocentesis (puncture of a valve to remove fluid).