Zhao G, Hu Z, Yang J, Zhong C
Institute of Space Medico-Engineering, Beijing, China.
Space Med Med Eng (Beijing). 1998 Oct;11(5):324-8.
In order to investigate characteristics of cervical blood flow in subjects with different tolerances to head-down tilt (HDT), 40 healthy men (aged 26-35 years) participated in the test of -30 degrees HDT for 45 min. During the test, mean blood flow velocities, diameters and blood flow volume of common carotid artery (CCA), Internal carotid artery (ICA), Internal jugular vein (IJV) were measured with color Doppler echogram. The results showed that there have different changes of in-flow of ICA and out-flow of UV between the adaptive subjects (n=33) and the inadaptive subjects (n=7). In the adaptive group, the cerebral blood flow volume during HDT, did not change from that during horizontal supine position. However, in the inadaptive group in-flow of ICA increased and out-flow of IJV decreased significantly during HDT as compared with those during horizontal supine position.
为了研究不同头低位倾斜（HDT）耐受性受试者的颈部血流特征，40名健康男性（年龄26 - 35岁）参与了-30度HDT持续45分钟的测试。测试期间，用彩色多普勒超声测量颈总动脉（CCA）、颈内动脉（ICA）、颈内静脉（IJV）的平均血流速度、直径和血流量。结果显示，适应性受试者（n = 33）和非适应性受试者（n = 7）的ICA流入和IJV流出存在不同变化。在适应性组中，HDT期间的脑血流量与水平仰卧位时相比没有变化。然而，在非适应性组中，与水平仰卧位相比，HDT期间ICA的流入显著增加，IJV的流出显著减少。
