The mitral A wave velocity increased throughout gestation with the peak at the third trimester(0.59+0.10m/s),while E wave changing slightly, following the decrease of E/A.

• 二尖瓣EF斜率孕晚期显示较前减小。 二尖瓣E峰峰值、跨瓣压差各组间无统计差别，A峰孕晚期增至最大(0.；59士0