CAJ | 학술논문

目的为飞行员脑功能鉴定及防护提供试验方法和依据.方法采用经颅多普勒超声连续观察45名飞行员(平均年龄27.5±2.6岁)在完成5 h连续心算和连续操作任务期间的脑平均血流速度(Win),同步分析大脑前动脉(ACA)、中动脉(MCA)、后动脉(PCA)的Vm、神经行为能力指数(NAI),并对脑疲劳诱发的嗜睡倾向进行斯坦福嗜睡量表(SSS)评定.结果在完成连续心算任务的第2 h,大脑ACA的Vm增快,第4 h以后减慢,MCA、PCA的Vm无显著变化.完成连续操作任务的第4 h以后,PCA的Vm先于MCA的Vm减慢,ACA、MCA和PCA的Vm直至第5 h才明显减慢.反映连续操作能力的NAI指数在第2 h上升,第4 h以后下降.反映心算能力下降的错误反应率和反映脑功能状态的SSS评分在第4 h以后显著上升,表明脑功能出现显著抑制.结论不同认知活动对大脑Vm的影响存在差异.5 h连续心算任务没有诱发Vm的显著变化,但5 h连续操作任务诱发MCA的Vm大幅度降低,有可能是晕厥前症状或立位耐力降低的诱发因素之一.
목적 위비행원뇌공능감정급방호제공시험방법화의거.방법채용경로다보륵초성련속관찰45명비행원(평균년령27.5±2.6세)재완성5 h련속심산화련속조작임무기간적뇌평균혈류속도(Win),동보분석대뇌전동맥(ACA)、중동맥(MCA)、후동맥(PCA)적Vm、신경행위능력지수(NAI),병대뇌피로유발적기수경향진행사탄복기수량표(SSS)평정.결과재완성련속심산임무적제2 h,대뇌ACA적Vm증쾌,제4 h이후감만,MCA、PCA적Vm무현저변화.완성련속조작임무적제4 h이후,PCA적Vm선우MCA적Vm감만,ACA、MCA화PCA적Vm직지제5 h재명현감만.반영련속조작능력적NAI지수재제2 h상승,제4 h이후하강.반영심산능력하강적착오반응솔화반영뇌공능상태적SSS평분재제4 h이후현저상승,표명뇌공능출현현저억제.결론 불동인지활동대대뇌Vm적영향존재차이.5 h련속심산임무몰유유발Vm적현저변화,단5 h련속조작임무유발MCA적Vm대폭도강저,유가능시훈궐전증상혹립위내력강저적유발인소지일.
Objective To provide the methods and evidences for monitoring and protection of pilot's cerebral function(CF). Methods Forty-five male pilots(average age were 27.5±2.6 years,ranging from 25 to 32 years)served as subjects.Mean blood velocity(Vm)in anterior cerebral artery(ACA),middle cerebral artery(MCA)and posterior cerebral artery(PCA)was tested by transcranial Doppler ultrasongraphy during 5 h mental arithmetic tasks and consecutive performance tasks.Neurobehavioral ability index(NAI)and scores of Stanford sleepiness scale(SSS)were analyzed individually. Results When performing mental arithmetic tasks.Vm in ACA increased at the second hour and decreased after the fourth hour,there were no significant changes in MCA and PCA.When performing consecutive performance tasks,Vm in PCA declined earlier than that in MCA after the fourth hour.Vm in ACA,MCA and PCA did not decrease significantly until the fifth hour.The rising trend of NAI Was found after the second hour,while falling trend after the fourth hour.After the fourth hour,the false responding rate of mentaI arithmetic tasks and SSS scores increased significantly which showed depression of CF. Conclusion The effect of cognitive tasks on Vm was different.5 h mental arithmetic tasks didn't have significant effect on Vm in MCA.Significant decrease of Vm in MCA when performing consecutive performance tasks for 5 h may be a factor inducing presyncope or poor orthostatic tolerance.