Mitral valve prolapseBy Mayo Clinic staff
Original Article: http://www.mayoclinic.com/health/medical/IM03955
Mitral valve prolapse
The mitral valve separates the two chambers (atrium and ventricle) of the left side of the heart. In mitral valve prolapse, the leaflets of the mitral valve bulge (prolapse) into the left atrium like a parachute during the heart's contraction.