small left ventricleleft ventricle systolic dysfunctionhypercontractile left ventricletrabeculated ventriclecardiomyopathy left ventriclehyperdynamic left ventricledescription of right ventriclehypokinetic left ventriclehypertrophied left ventriclehypertrophic ventriclehyperkinetic left ventriclehypoplastic left ventricle