Mitral regurgitation An abnormality of the mitral valve characterized by insufficiency or incompetence of the mitral valve resulting in retrograde leaking of blood through the mitral valve upon ventricular contraction. SNOMEDCT_US:48724000 HP:0001653 Fyler:1151 Mitral insufficiency Mitral incompetence UMLS:C3551535 Mitral valve insufficiency UMLS:C0026266 Mitral regurgitation, mild Mitral valve regurgitation Abnormal mitral valve physiology