Assertion: obstruction's cause | /r/HasProperty | rheumatic heart disease
Facets:
value: almost always
type: TEMPORAL
Source sentences:
text: mitral stenosis a narrowing of the left atrioventricular orifice ( a narrowing of the left atrioventricular orifice ( mitral valve ) due to inflammation and scarring; the cause is almost always rheumatic heart disease.