Mechanistic insights into functional mitral regurgitation

Robert A. Levine, Judy Hung, Yutaka Otsuji, Emmanuel Messas, Noah Liel-Cohen, Nadia Nathan, Mark D. Handschumacher, J. Luis Guerrero, Shengqiu He, Ajit P. Yoganathan, Gus J. Vlahakes

    Research output: Contribution to journalArticlepeer-review

    87 Scopus citations

    Abstract

    Effective valve repair in patients with mitral regurgitation (MR) demands an understanding of its mechanism. In patients with ischemic heart disease and functional MR, which doubles late mortality, normal leaflets are apically displaced. This reflects an altered balance of forces acting on the leaflets: increased tethering forces restricting closure, resulting from an altered geometry of leaflet attachments, and decreased ventricular forces acting to close the leaflets. Extensive evidence confirms a central and predominant role of tethering as the final common pathway inducing functional MR; left ventricular (LV) pressure dynamically modulates the orifice area. Because ischemic MR is a disease of the entire mitral complex, including the remodeling LV, reducing annular size alone is often ineffective. Undersizing rings attempts to compensate for tethering; new and potentially more effective strategies directly address tethering by infarct plication, papillary muscle repositioning with a localized patch, or basal chordal cutting to increase coaptational surface area without prolapse. A comprehensive understanding of the valve in its ventricular context, therefore, provides new opportunities for successful valve repair in patients.

    Original languageEnglish
    Pages (from-to)125-129
    Number of pages5
    JournalCurrent Cardiology Reports
    Volume4
    Issue number2
    DOIs
    StatePublished - 1 Dec 2002

    ASJC Scopus subject areas

    • Cardiology and Cardiovascular Medicine

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