Topographic Characteristics of EEG During a Saturation Dive to a 31 ATA Helium-Oxygen Environment with Specific Reference to Fmθ or FIRDA

  • S. Matsuoka
  • C. Kadoya
  • S. Okuda
  • S. Wada
  • M. Mori
Conference paper

Abstract

There are many electrophysiological studies concerning saturation excursion dives in hyperbaric environments, that reveal an increase in the theta wave (Procter et al. 1972; Bennett et al. 1982; Naquet et al. 1984). However, in traditional electroencephalography (EEG), no detailed analyses have been done to clarify the nature of the theta wave in this situation because of the restrictions imposed by the environment and the limitations associated with the induction electrode. Therefore, it is necessary to adopt a multielectrode induction recording system. Using the 16-channel recording system we developed (Ueno and Matsuoka 1975), a topographic display of the EEG has been employed to conduct underwater experiments in an attempt to establish the changes occurring in the EEG (in all frequency bands) at different sea depths and to establish a correlation between the regions in which these changes occur.

Keywords

Helium Topo 

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References

  1. Bennett PB, Coggin R, Mcleod M (1982) Effect of compression rate on use of trimix to ameliorate HPNS in man to 686 m (2250 ft) Undersea Biomed Res 9:335–351Google Scholar
  2. Daly DD (1975) Genesis of abnormal activity. In: Antorne R (ed) Handbook of electroencephalography and clinical neurophysiology, vol 14/C. Elsevier, Amsterdam, pp 5–10Google Scholar
  3. Matsuoka S, Tokuda H, Ishikawa T (1984) The idea of computer topographic display of EEG for clinical assessment of EEG and evoked potential data. In: Matsumoto K (ed) Topographic electroencephalography in clinical testing. Neuron-sha, Tokyo, pp 23–33 (in Japanese)Google Scholar
  4. Matsuoka S, Okuda S, Wada S, Kadoya C, Ishikawa T, Yamamoto S, Mori M (1987) Topographic characteristics of EEG during a saturation dive to 31 ATA helium-oxygen environment. Clin Encephalogr 29:584–593 (in Japanese)Google Scholar
  5. Naquet R, Lemaire C, Rostain JC (1984) High pressure nervous syndrome: psychometric and clinico-electrophysiological correlations. Philos Trans R Soc Lond [Biol] 304:95–102CrossRefGoogle Scholar
  6. Procter LD, Carey CR, Lee RM et al. (1972) Electroencephalographic changes during saturation excursion dives to a simulated sea water depth of 1000 feet. Aerospace Med 43(8): 867–877Google Scholar
  7. Ueno S, Matsuoka S (1975) Topographic display of slow wave types of EEG abnormality in patients with brain lesions. Jpn J Med Electronics Biol Eng 14:118–124 (in Japanese)Google Scholar
  8. Ueno S, Matsuoka S, Mizoguchi T et al. (1975) Topographic computer display of abnormal EEG activities in patients with CNS diseases. Memoirs of the Faculty of Eng, Kyushu Univ 34:195–209Google Scholar
  9. Westmoreland BF, Klass DW (1986) Midline theta rhythm. Arch Neurolog 43:139–141CrossRefGoogle Scholar
  10. Yamaguchi Y (1981) Frontal midline theta activity. In: Yamaguchi N, Fujisawa K, (eds). Recent advances in EEG and EMG data processing. Elsevier/North-Holland, Amsterdam, pp 391–396Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1989

Authors and Affiliations

  • S. Matsuoka
    • 1
  • C. Kadoya
    • 1
  • S. Okuda
    • 1
  • S. Wada
    • 1
  • M. Mori
    • 2
  1. 1.Department of NeurosurgeryUniversity of Occupational and Environmental HealthKitakyushu 807Japan
  2. 2.Japan Marine Science and Technology CenterTokosuka 237Japan

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