Mitral valve closure is incomplete.

Mitral valve insufficiency may be caused by rheumatic fever, mitral valve prolapse, hypertrophic cardiomyopathy, acute myocardial infarction and other causes.

1.

Rheumatic fever in patients with rheumatic fever can lead to local chronic inflammatory reaction, mitral valve fibrosis may occur, resulting in abnormal mitral valve structure and function, resulting in mitral valve insufficiency.

2. Mitral

valve prolapse in patients with mitral valve prolapse may occur mitral valve leaflet loose, chordae tendineae length is too long, affecting the normal contraction of the mitral valve, resulting in mitral valve insufficiency.

3. Hypertrophic cardiomyopathy

Hypertrophic cardiomyopathy in patients with left ventricular hypertrophy, enlargement, can cause mitral valve annulus abnormal enlargement, at this time will also occur mitral valve insufficiency.

4. Acute myocardial infarction

coronary artery blood supply insufficiency can cause acute myocardial infarction, leading to the patient's papillary muscle rupture, unable to pull the mitral valve leaflet, easy to cause mitral valve insufficiency.