Mitral valve prolapse (MVP) is a very common clinical condition that refers to a systolic billowing of one or both mitral valve leaflets into the left atrium. MVP can be associated with significant mitral regurgitation (MR), bacterial endocarditis, congestive heart failure, and even sudden death. According to the presently used echocardiographic criteria, MVP is defined as an upward displacement of the mitral leaflets that exceeds 2 mm during diastole. In classical MVP, the leaflets' maximal thickness is >5 mm, whereas in non-classical MVP it remains <5 mm. MVP may or may not have associated mitral regurgitation. MVP can be distinguished into primary or nonsyndromic MVP and secondary or syndromic MVP. In the latter case, MVP occurs in the presence of connective tissue disorders such as Marfan syndrome (MFS) [DS:H00653], Loeys-Dietz syndrome [DS:H00800], Ehlers-Danlos syndrome [DS:H00802], and osteogenesis imperfecta [DS:H00506]. Nonsyndromic MVP can be sporadic or familial, demonstrating autosomal dominant and X-linked inheritance. Three different loci on chromosomes 16, 11 and 13 have been found to be linked to MVP. Another locus on chromosome X has been found to cosegregate with a rare form of MVP called X-linked myxomatous valvular dystrophy.
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Toomer KA, Yu M, Fulmer D, Guo L, Moore KS, Moore R, Drayton KD, Glover J, Peterson N, Ramos-Ortiz S, Drohan A, Catching BJ, Stairley R, Wessels A, Lipschutz JH, Delling FN, Jeunemaitre X, Dina C, Collins RL, Brand H, Talkowski ME, Del Monte F, Mukherjee R, Awgulewitsch A, Body S, Hardiman G, Hazard ES, da Silveira WA, Wang B, Leyne M, Durst R, Markwald RR, Le Scouarnec S, Hagege A, Le Tourneau T, Kohl P, Rog-Zielinska EA, Ellinor PT, Levine RA, Milan DJ, Schott JJ, Bouatia-Naji N, Slaugenhaupt SA, Norris RA
