Does MI, for example, stand for mitral incompetence or myocardial infarct?

Mitral regurgitation (MR), mitral insufficiency or mitral incompetence is a disorder of the heart in which the mitral valve does not close properly when the heart pumps out blood.

The device made in the configuration for mitral replacement had to be withdrawn, after implantation in a small number of patients, because of excessive flexibility of the stent causing mitral incompetence.