lower ejection fraction left ventricular normal limit lvef lln institutional 
ef ejection fraction ventricular left cardiac echocardiogram heart dimensional uncontrolled 
ejection left ventricular fraction cardiac rest function greater arrhythmias disease 
fraction liver shortening ejection portal capacity tlc approve pi supplementary 
fraction shortening ejection left ventricular fractional cardiac function cardiologist greater 
lvef left ejection fraction ventricular cardiac known improve symptomatic rest