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M-mode display of mitral valve. Anterior mitral valve leaflet (AMVL) during diastole moves anteriorly like letter of “M” and posterior mitral valve leaflet moves backward like letter of “W”. Mitral leaflets motion during one cardiac cycle is labeled as A–E, and F. Note: leaflet closure line (C–D line) in systole is straight and towards the interventricular septum.
