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Titolo:
Transient and maintained changes of the spontaneous occipital EEG during acute systemic hypoxia
Autore:
Schellart, NAM; Reits, D;
Indirizzi:
Acad Med Ctr, Dept Med Phys, NL-1100 DD Amsterdam, Netherlands Acad Med Ctr Amsterdam Netherlands NL-1100 DD DD Amsterdam, Netherlands Acad Med Ctr, Dept Visual Syst Anal, NL-1100 DD Amsterdam, Netherlands Acad Med Ctr Amsterdam Netherlands NL-1100 DD DD Amsterdam, Netherlands
Titolo Testata:
AVIATION SPACE AND ENVIRONMENTAL MEDICINE
fascicolo: 5, volume: 72, anno: 2001,
pagine: 462 - 470
SICI:
0095-6562(200105)72:5<462:TAMCOT>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
QUANTITATIVE EEG; HYPOBARIC HYPOXIA; HIGH-ALTITUDE; OXYGEN;
Keywords:
qEEG; normobaric acute hypoxia; alpha rhythm; transient behavior;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Schellart, NAM Acad Med Ctr, Dept Med Phys, POB 22660, NL-1100 DD Amsterdam, Netherlands Acad Med Ctr POB 22660 Amsterdam Netherlands NL-1100 DD ds
Citazione:
N.A.M. Schellart e D. Reits, "Transient and maintained changes of the spontaneous occipital EEG during acute systemic hypoxia", AVIAT SP EN, 72(5), 2001, pp. 462-470

Abstract

Background: it has been reported that during systemic hypoxia the spectralpower of spontaneous EEG (closed eyes) increases, except for the power in the alpha band, which decreases. Hypothesis: It is surmised that after a sudden decrease in inspired oxygen, the EEG parameters and SaO(2) Show Similar temporal characteristics. Methods: Normobaric acute hypoxia in 14 healthysubjects was evoked by breathing a hypoxic gas. Frequency spectra were calculated from occipital recordings and quantified together with the parameters of the spectral alpha peak. Results: During the first 20 min of exposure, Sao, decreases exponentially. With eyes open, the frequency bands show a transient increase in power (110-160%). The peak-time of the transient is shorter for the alpha and beta1 bands (4.5 min) than for the delta2 and theta bands (7 min). After the transient, the bands reach sustained power revels ca. 65% higher than the control value. The frequency of the alpha peak decreases with 0.61 +/- 0.16 Hz (mean +/- SE). In contrast to the eyes-closedcondition, the peak amplitude increases(41 +/- 12%). Conclusions: During systemic hypoxia many characteristics of the spontaneous EEG with open yes differ from these under normoxia, and alpha activity deviates strongly from that during hypoxia with closed eyes. During the first 20 min of exposure changes in power are most prominent and do not Follow the change of Sao,. Monitoring total EEG power with open eyes, S;to, and respiration gives a goodimpression of the hypoxia-related neurophysiological state of the subject.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 23:11:38