彩色多普勒对肠系膜上动脉餐前、后血流动力学改变的研究

目的：研究正常成人肠系膜上动脉（SMA）餐前、后血流动力学改变，探讨其临床意义，方法：采用多普勒超声分别测量55例正常成人餐前、后SMA的血流参数，包括SMA的直径（D），收缩期峰值速度（Vmax），舒张末期速度（Vmin)时间平均速度（Vmean)，及阻力指数（RI），搏动指数（PI），分析其差异性，并提出正常值范围，试餐用25％的葡萄糖20ml，餐后30分钟检查。结果：正常成人餐前、后SMA血流动力学各参数间存在显著差异（P＜0．05），餐后血流速度和血流量明显高于餐前，而I和PI均显著降低。结论：认识不同生理状态下SMA血流动力学改变及其正常值范围对临床有重要意义。

Color Doppler Study of Fasting and Postprandial Hemodynamic Chan ges in the Superior Mesenteric Artery in Healthy Subjects

Objective:To investigate the fasting and postprandial hemodynamic changes in the superior mesenteric artery(SMA)in healthy subjects and its clinical significance.Methods:Fifty five healthy subjects underwent Doppler sonography of the SMA before and after ingesting a standard meal(25% glucose 200ml).The hemodynamic parameters were obtained.Results:Significant difference of Doppler parameters of SMA was found between fasting and postprandial state( P <0 05).The velocities and volumes in SMA were increased from baseline values after glucose ingestion.The resistance index(RI)and pulsatile index(PI)were decreased significantly.Conclusions:There are hemodynamic changes of SMA in different physical states.It is important for physicians to know the range of normal values.