leaf scar. (botany). A mark on a stem, formed by secretion of suberin and a gumlike substance, showing where a leaf has abscised. 1  Facebook. 2  Twitter.
Mitral valve regurgitation means that one of the valves in your heart-the mitral valve-is letting blood leak backward into the heart.Heart valves work like one-way gates, helping blood flow in one direction between heart chambers or in and out of the heart. The mitral valve is on the left side of your heart.It lets blood flow from the upper to the lower heart chamber. See a picture of mitral valve regurgitation.When the mitral valve is damaged-for example, by an infection-it may no longer close tightly.This lets blood leak backward, or regurgitate, into the upper chamber.t lets blood flow from the upper to the lower heart chamber. See a picture of mitral valve regurgitation. When the mitral valve is damaged-for example, by an infection-it may no longer close tightly. This lets blood leak backward, or regurgitate, into the upper chamber.
Treatment of mitral valve regurgitation depends on how severe your condition is, whether it's getting worse and whether you have symptoms. For mild leakage, treatment may not be necessary. You may need heart surgery to repair or replace the valve for severe leakage or regurgitation.