DHF occurs when signs and symptoms of heart failure are present but left ventricular systolic function is preserved (i. e. ejection fraction greater than 45 percent).
DHF是指有心衰的症状和体征而左室收缩功能正常(射血分数大于45%)。
Left ventricular end diastolic volume (LVEDV), left ventricular end systolic volume (LVESV), left ventricular ejection fraction (LVEF) and cardiac events in each group were followed up.
随访两组患者的左室收缩末期容积(LVESV)、左室舒张末期容积(LVEDV)、左室射血分数(LVEF)及心脏事件。
Objective: to evaluate if the mitral annular systolic motion velocities measured by Doppler quantitative tissue velocity image (QTVI) correlated with left ventricular ejection fraction (LVEF).
目的：应用超声定量组织速度显像(QTVI)技术测定二尖瓣环运动速度，评价其是否与左室整体收缩功能指标左室射血分数(L VEF)相关。
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