大脑磁共振成像对非催眠性催眠性压缩减压的反应
Aerospace medicine and human performance
|October 21, 2024
概括
这项研究发现,高度减压疾病可以导致白质 (WM) 变化,由降低的神经保护化学物质 (如GABA和GSH) 表示. 这些变化表明氧化应激和微血管流动受损,暴露后至少持续24小时.
科学领域:
- 航空航天医学 航空航天医学
- 神经科学是一个神经科学.
- 生理学 生理学 生理学
背景情况:
- 神经性减压疾病 (NDS) 的病理生理学及其与非低压性低压症下的大脑白质 (WM) 变化之间的联系尚不清楚.
- 之前的研究已经利用脑磁共振扫描 (MRI) 探索了急性WM对低压暴露的反应.
研究的目的:
- 为了研究强度低压暴露对皮下白质完整性,脑血流和神经代谢物度的影响.
- 评估大脑皮下白质变化与非低毒性低血症之间的关联.
主要方法:
- 六名健康男性接受了6小时的高氧性低压症治疗,并进行了3次降压,达到22,000英尺以上的高度.
- 大脑MRI在减压前后进行,以评估皮质下WM完整性,大脑血流,分数异性质和神经代谢物.
主要成果:
- 没有观察到皮下病变或WM分数异性变化.
- 平均WM血液流量增加了20%,而灰质流量保持不变.
- 在五个受试者体内,表皮皮下WM水平的胺黄油酸 (GABA) 和谷氨 (GSH) 显著下降,乳酸水平增加.
结论:
- 在GABA和GSH中的液表明WM侮辱,神经保护的损失和氧化应激在hypobaric暴露后.
- GSH下降与WM血流反应相关,表明潜在的微血管失调.
- 观察到的WM神经代谢物和血流变化在暴露后24小时内没有正常化.
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