title: [A fluctuographic analysing of EEG patients with paroxysmal headache].
abstract: OBJECTIVE
  To offer reference of the screening procedure for aircrew and astronaut selection.
  
  
  METHODS
  The competitive frequency-fluctuation characteristics of the dominant frequency in the band of 7-12 Hz in EEG and power density spectra of alpha band power-fluctuation were analyzed with a newer system of electroencephalofluctuographic technology in 20 patients (male 13, female 7, aged 17-37 years) with paroxysmal headache.
  
  
  RESULTS
  During episodes of headache in the affected sites the cumulated dominant fluctuation probability of each frequency components was in the order of 7, 8, 9, 10, 11, 12 Hz from high to low; The relative entropy value was 92.25% +/- 3.41%; Two peaks having at least 25% higher value than those of its neighbors were observed at 1.86 mHz and 4.65 mHz in power density spectra of power-fluctuation. During the intervals of episodes the above-mentioned probability character disappeared; The relative entropy value was decreased to 69.08% +/- 4.16% ; A new peak was found at 0.93 mHz in spectra power-fluctuation, with a reduction in peak value power at 4.65 mHz.
  
  
  CONCLUSIONS
  It not only offered a parameter for pathophysiological and functional evaluation of paroxysmal headache, but also provided reference of the screening procedure for aircrew and astronaut selection.
authors.affiliation: Institute of Space Medico-Engineering, Beijing, China.
authors.forename: C D
authors.initials: CD
authors.lastname: Zhuo
authors.forename: D X
authors.initials: DX
authors.lastname: Han
authors.forename: Y H
authors.initials: YH
authors.lastname: Liu
authors.forename: Y J
authors.initials: YJ
authors.lastname: Zhai
mesh_terms: D000293:Adolescent; D000328:Adult; D000337:Aerospace Medicine; D000513:Alpha Rhythm; D004569:Electroencephalography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D010560:Personnel Selection; D014653:Vascular Headaches / Q000175:diagnosis / Q000503:physiopathology*