label: Abnormal left ventricular ejection fraction
label_lc: abnormal left ventricular ejection fraction
description: "Any abnormality of the left ventricular ejection fraction (LVEF), which is the fraction of chamber volume ejected in systole (stroke volume) in relation to the volume of the blood in the ventricle at the end of diastole (end-diastolic volume). Stroke volume (SV) is calculated as the difference between end-diastolic volume (EDV) and end-systolic volume (ESV). LVEF is calculated as [SV/EDV] in percent."