发生脑短暂性缺血发作的飞行员脑α波优势频率的不确定性 …

探讨脑短暂性缺血发作引起的脑功能紊乱的生物电特征，为飞行员，航天员选拔提供可参考的评价方法。方法 用ＣＦＭ－８Ｄ ＥＥＧ监护仪记录了１２名飞行员发生ＴＩＡ后的ＥＥＧ。应用脑波频率涨落分析系统分析了脑α波优势频率的不确定性，并与２０名健康飞行员进行了比较。结果 发生了ＴＩＡ但ＥＥＧ正常的飞行员，其主频出现优势少落几率与健康飞行员比有明显的差异，且主频几率优势比指数Ｉ≥０，而健康飞行员主频几率优势比Ｉ

Dominant frequency uncertainty analysis of EEG alpha activity in pilots with transient ischemic attacks.

Objective. To study the characteristics of EEG after transient ischemic attack and to offer reference for screening procedure of aircrew and astronaut selection. Method. The dominant frequency uncertainty of alpha band EEG in 12 pilots (males; age 30 +/- 5) with transient ischemic episodes in middle cerebral artery (MCA) territories and in 20 normal healthy pilots was analyzed with frequency-fluctuation analysis. Result. The dominant probability of the main frequency coinciding with sites affected by transient ischemic attack (TIA) in patient pilots was higher than that in healthy pilots (P<0.01), and the dominant probability ratio logarithmic index I >or= 0 in all patient pilots with normal EEG, but I<0 in all healthy pilots. It was also found that not only I >or= 0, but the second component shifted to lower frequency (8 Hz) in patients with slight focal EEG alterations, i.e. slowing of frequency. The relative entropy values (percentage) were decreased significantly in pilots with TIA as compared with healthy pilots (P<0.05). Conclusion. The dominant frequency uncertainty analysis of alpha band showed clear superiority of computerized evaluation over routine visual assessment for the diagnosis of minor cerebral ischemia. It offers not only a possibility of studying pathophysiological functional parameter, but also the reference for screening procedure in aircrew and astronaut selection.