parachute mitral valve
A parachute mitral valve is a valvular congenital abnormality usually identified in infants or young children, though it can present later, in adulthood.
Parachute mitral valves occur when all the chordae tendineae are attached to a single papillary muscle origin. Unlike the normal situation where there are two papillary muscles providing attachment to the two leaflets, this single-origin means the valve has limited opening, thus causing a relative obstruction. When presenting in infancy, the condition usually progresses to mitral stenosis.
It may occur as a single anomaly but is recognized as part of the Shone complex.
Other recognized associations include:
- supravalvular mitral ring
- subaortic stenosis
- aortic coarctation