Assertion: mitral valve's leaflet | /r/CapableOf | owe to annular dilation
Facets:
Source sentences:
text: The mechanism of regurgitation was due to tethering of the leaflets owing to papillary muscle shortening and annular dilation, as the chordae and leaflets were normal, the jets were central, and there was tip-to-tip coaptation of the leaflets of atrioventricular valves .