Document Detail

Quantitative EEG in acute mountain sickness.
MedLine Citation:
PMID:  9875615     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: To investigate if the EEG response at moderate altitude may predict a person's tolerance to acute mountain sickness (AMS). MATERIALS AND METHODS: Frequency analysis (QEEG) of tape-recorded ambulatory EEG was performed in 6 climbers during a mountaineering expedition to 7546 m above sea level. The QEEG response in climbers, measured at sea level, at 4500 m, and at 1800 m 1-4 days after maximal altitude exposure, was compared to the change observed during consecutive sea level recordings in 10 control subjects. RESULTS: Three climbers experienced slight (grade 1) AMS symptoms both at 4500 m and at maximal altitude exposure (Group 1). Three other climbers (Group 2) had no symptoms at 4500 m, but they developed AMS (grades 1, 2, or 3) at maximal altitude. Alpha amplitudes were higher at 4500 m in group 1 climbers, while it was lower in group 2 climbers compared to the sea level recording. Significant time x group interactions in ANOVA were found for delta (P = 0.005), theta (P = 0.001) and alpha (P = 0.001) amplitude, indicating that QEEG amplitudes decreased significantly at high altitude in group 2 climbers. CONCLUSION: The QEEG response to moderate hypobaric hypoxia is not uniform, but the direction of QEEG amplitude change, particularly in the alpha band, may possibly predict the risk of developing AMS.
T Sand; O Nygaard
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Acta neurologica Scandinavica     Volume:  98     ISSN:  0001-6314     ISO Abbreviation:  Acta Neurol. Scand.     Publication Date:  1998 Dec 
Date Detail:
Created Date:  1999-06-15     Completed Date:  1999-06-15     Revised Date:  2006-08-16    
Medline Journal Info:
Nlm Unique ID:  0370336     Medline TA:  Acta Neurol Scand     Country:  DENMARK    
Other Details:
Languages:  eng     Pagination:  386-90     Citation Subset:  IM; S    
Department of Neurology, University Hospital of Trondheim, Norway.
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MeSH Terms
Acute Disease
Altitude Sickness / physiopathology*
Analysis of Variance
Predictive Value of Tests
Risk Assessment

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