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目的：探讨飞行中实施Ｍ－３动作时颈总动脉（ＣＣＡ）血流动力学变化及意义。方法：应用彩色多普勒血流显像（ＣＤＦＩ）测量３２名战斗机飞行员在地面＋１Ｇｚ条件下实施Ｍ－３动作时ＣＣＡ收缩期峰１速度（Ｖｓ１）、收缩峰２速度（Ｖｓ２）、舒张峰速度（ＶＤ）、舒张末速度（Ｖｄ）、平均血流速度（Ｖｍ）、血流量（Ｖ）、心率（ＨＲ）、心水平收缩压（ＨＳＰ）、血管阻力指数（ＲＩ）、搏动指数（ＰＩ）等参数。结果：与动作前平静状态参数比较，Ｖｓ２、ＶＤ、Ｖｍ、Ｖ和ＨＳＰ分别提高４１％、３１％、２３％、２６％和５６％（Ｐ＜０．０１），ＲＩ和ＰＩ分别降低７％和２６％（Ｐ＜０．０１），Ｖｍ与Ｖ间呈正相关（ｒ＝０．６９，Ｐ＜０．０５），Ｖｓ１、Ｖｄ和ＨＲ与平静时比较无显著性差异（Ｐ＞０．０５）。结论：Ｍ－３动作能增加静脉回心血量，提高大动脉血压，加快ＣＣＡ的Ｖｓ２、ＶＤ和Ｖｍ值，降低脑血管阻力，有利于维持脑部供血
Objective: To investigate the hemodynamic changes of common carotid artery (CCA) during M-3 maneuver in flight and its significance. Methods: CDFI was used to measure the peak systolic velocity (Vs1), peak systolic velocity (Vs2), diastolic peak (Vs2) of 32 fighter pilots at M + (VD), end-diastolic velocity (Vd), mean blood flow velocity (Vm), blood flow (V), heart rate (HR), cardiac systolic pressure (HSP), vascular resistance index (RI), pulsatility index ) And other parameters. Results: Vs2, VD, Vm, V and HSP increased by 41%, 31%, 23%, 26% and 56% respectively compared with those before exercise (P <0.01) And 26% (P <0.01). There was a positive correlation between Vm and V (r = 0.69, P <0.05). There was no significant difference between Vs1, Vd and HR ). Conclusion: M-3 action can increase venous blood volume, increase aortic blood pressure, speed up Vs2, VD and Vm of CCA, decrease cerebral vascular resistance, and maintain brain blood supply