Mitral valve stenosis is a common disease.

Mitral stenosis may be caused by congenital dysplasia, senile degenerative disease, streptococcal infection, systemic lupus erythematosus, etc.

1. Congenital

abnormality of mitral valve in patients with congenital dysplasia may affect the opening of mitral valve and lead to mitral stenosis when mitral valve annulus is small or chordae tendineae are not fully developed.

2.

Tissue calcification may occur in patients with senile degenerative disease when they are older, which may easily involve the site of leaflet junction, resulting in mitral valve leaflet opening disorder and mitral stenosis.

3. Streptococcal

infection may reproduce in vivo after streptococcal infection, resulting in fibrosis and atrophy of mitral valve leaflets, resulting in mitral valve disease, which may also cause mitral valve stenosis.

4. Systemic lupus erythematosus occurs

. Autoimmune function may be abnormal, resulting in thickening and adhesion of mitral valve leaflets, resulting in mitral valve stenosis.