nine ( 57 % ) of the patients without aneurysm had either left ventricular end-systolic dimensions in excess of 6 cm combined with reduced contraction of the base of the left ventricle ( fractional shortening of the level of the mitral valve less than 20 % ) , or gross reduction of contraction ( fractional shortening less than 15 % ) regardless of left ventricular dimension .
C0026264
mitral valve
C0225897
left ventricular