Valvuloplasty refers to the alteration or correction of a defective valve, in contrast to a replacement of the valve. Valvuloplasty can be done through surgery or balloon dilation. Surgical valvuloplasty is usually done on the mitral valve. A mitral valve that leaks due to large, floppy valve leaflets, or a broken chordae tendonae can be surgically tapered, cut, trimmed, and repaired. A repaired valve is preferred over a replacement prosthetic valve.