The ratio of early to late atrial diastolic peak flow velocity(VE/VA),the ratio of early to late atrial time-velocity integral (ETVI/ATVI) and isovolumic relaxation time(IVRT) were observed.

• 检测指标包括:舒张早晚期最大充盈速率比值(VE/VA)及其时间流速积分比值(ETVI/ATVI)和等容舒张时间(IVRT)。