Improvement in left ventricular systolic function with ejection fraction increasing from 25 to 33%Decreased left ventricular internal diameter end systole from 5.3 to 4.9 cm after treatment with dobutamine.LVIDs: left ventricular internal diameter end systole; ESV: end-systolic volume; EF: ejection fraction; SV: stroke volume; LA: left atrium; LA Diam: left atrial diameter