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Tytuł pozycji:

Effects of different speeds of induction with sevoflurane on the EEG in man

Tytuł:
Effects of different speeds of induction with sevoflurane on the EEG in man
Autorzy:
Avramov, Mihail Nikolaev
Shingu, Koh
Omatsu, Yoshiteru
Osawa, Masami
Mori, Kenjiro
Źródło:
Journal of Anesthesia; March 1987, Vol. 1 Issue: 1 p1-7, 7p
Periodyk
The effects of two kinds of induction speed of sevoflurane anesthesia on the EEG pattern were compared in the same individual using medical student volunteers: a first exposure of 4% was given, followed after full recovery, by incremental doses of 1, 2 and 4% successively, each being administered for 10 min. The arterial blood level of the anesthetic was measured using gaschromatograph. The changes of EEG pattern during fast induction with 4% were not represented by the abbreviation of those observed during the slow induction with the incremental doses. The administration of 4% induced a sudden appearance of high voltage, rhythmic slow waves of 2–3 Hz at 1–3 min when the arterial blood anesthetic level increased maximally, which was then followed by a pattern of faster activities of 10–14 Hz mixed with 5–8 Hz slow waves. In contrast, the administration of incremental doses induced an increase in frequency and amplitude of EEG activities in the light plane, followed by their decreases in deeper planes. The final EEG patterns were identical for both these methods of induction. These findings confirmed our previous hypothesis that not only the arterial blood level of anesthetics but the rate of its increase are important factors determining the EEG pattern of anesthesia. (Avramov MN et al.: Effects of different speeds of induction with sevoflurane on the EEG in man. J Anesth 1: 1–7, 1987)

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