飞行因素对飞行人员脑血流动力学变化的影响

Study on the cerebral hemodynamics of pilots

目的对比分析飞行员和健康志愿者的动态脑血流动力学特征,探讨飞行因素对脑血流动力学特征的影响。方法采用多普勒超声技术分别观察飞行员(n=99)和健康志愿者(n=99)大脑前、中、后动脉,椎动脉及基底动脉的收缩期峰值(systolic velocity,Vs),舒张期流速(diastolic velocity,Vd),平均血流速度(mean velocity,Vm),血管搏动指数(pulsitility index,PI)。结果与健康志愿者比较,飞行员的左侧椎动脉(颅内段)Vm(34.77±8.40,32.60±6.20;P=0.038)降低。结论飞行因素可以导致飞行人员左侧椎动脉流速的降低,可能会进一步诱发眩晕等症状。

Objective To analyze the cerebral hemodynamics characteristics of pilots to provide the physiological basis for physical examination. Methods total of 99 pilots and 99 healthy volunteer were divided into 2 groups. The Doppler probe was used to detect the cerebral hemodynamics parameters including blood flow velocity, ulsatility index and resistance index of the intracranial arteries. Results The average blood flow velocities of left vertebral arteries were decreased in pilots compared with the healthy voulteers （P=0. 038）. Conclusion The decreased average blood flow velocities of vertebral arteries may lead to the low perfusion of the posterior circulation, which may cause the symptom of dizziness. So it is the threat to flight safety. We should pay attention to the examination of vertebral arteries in physical examination for pilots.