Final answer:
Percutaneous mitral balloon commissurotomy is used for treating mitral valve stenosis with a non-calcified, pliable valve without significant mitral regurgitation or left atrial thrombus, using a balloon-tipped catheter to dilate the valve.
Step-by-step explanation:
Percutaneous mitral balloon commissurotomy is a medical procedure indicated for patients with mitral valve stenosis, specifically those who have a non-calcified and pliable valve without significant mitral regurgitation or left atrial thrombus. It is considered when the mitral valve area is diminished and the patient is symptomatic. This less invasive procedure is often preferred over surgical options for the right candidates and involves the use of a balloon-tipped catheter, similar to the ones used in angioplasty, to dilate the narrowed valve.