Transmitral flow velocities during early diastole(E) and atrial contraction(A) were also measured by Doppler echocardiography and E/A ratio, E/Ve ratio were calculated.

• 应用彩色多普勒超声心动图测量二尖瓣口舒张期血流快速充盈速度E峰,左房收缩充盈速度A峰,计算E/A值和E与平均Ve的比值(E/Ve)。