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Analysis of brain connectivity during nitrous oxide sedation using graph theory : 그래프 이론을 이용한 아산화질소 진정 동안의 뇌 연결성 변화에 관한 연구

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Authors

이지민

Advisor
신터전
Major
치의학대학원 치의과학과
Issue Date
2018-02
Publisher
서울대학교 대학원
Keywords
Graph theoryNitrous oxideSedationElectroencephalogram (EEG)
Description
학위논문 (석사)-- 서울대학교 대학원 : 치의학대학원 치의과학과, 2018. 2. 신터전.
Abstract
Nitrous oxide, the least potent inhalation anesthetic, is widely used for conscious sedation. Recently, it has been reported that the occurrence of anesthetic-induced loss of consciousness decreases the interconnection between brain regions, resulting in brain network changes. However, few studies have investigated these changes in conscious sedation using nitrous oxide. Therefore, the present study aimed to use graph theory to analyze changes in brain networks during nitrous oxide sedation.
Participants were 20 healthy volunteers (10 men and 10 women, 20–30 years old) with no history of systemic disease. We acquired electroencephalogram (EEG) recordings of 32 channels during baseline, nitrous oxide inhalation sedation, and recovery. EEG epochs from the baseline and the sedation state (50% nitrous oxide) were extracted and analyzed with the network connection parameters of graph theory.
Analysis of 1/f dynamics, revealed a steeper slope while in the sedation state than during the baseline. Network connectivity parameters showed significant differences between the baseline and sedation state, in delta, alpha1, alpha2, and beta2 frequency bands. The most pronounced differences in functional distance during nitrous oxide sedation were observed in the alpha1 and alpha2 frequency bands.
Change in 1/f dynamics indicates that changes in brain network systems occur during nitrous oxide administration. Changes in network parameters imply that nitrous oxide interferes with the efficiency of information integration in the frequency bands important for cognitive processes and attention tasks. Alteration of brain network during nitrous oxide administration may be associated to the sedative mechanism of nitrous oxide.
Language
English
URI
https://hdl.handle.net/10371/142502
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