All of the following are true for mitral valve prolapse, except-

MVP, also variously termed the systolic click-murmur syndrome, Barlow's syndrome, floppy-valve syndrome, and billowing mitral leaflet syndrome Excessive or redundant mitral leaflet tissue, which is commonly associated with myxomatous degeneration and greatly increased concentrations of ceain glycosaminoglycans. There is an increased familial incidence for some patients, suggesting an autosomal dominant form of inheritance with incomplete penetrance. (Harrison's Principles of internal medicine, 18 th edition, page 1937 )