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在不同水平的神经元活动下,脑组织氧气和BOLD fMRI

D P Aksenov^1,2,3,4, K Rutila⁵, L Li⁶

¹Department of Radiology, NorthShore University HealthSystem, Evanston, IL, USA. daksenov@northshore.org.

Advances in experimental medicine and biology

|October 16, 2023

概括

麻醉会损害大脑的氧气和血液动力反应,扭曲血液氧气水平依赖 (BOLD) 信号和组织氧气水平 (PO2) 之间的关系. 这会影响神经元的代谢需求调节.

科学领域:

神经科学是一个神经科学.
生理学生理学生理学
医疗成像医学成像

背景情况:

神经元活动依赖于血液动力学反应来提供氧气.
改变基线神经元活动对血液动力学和氧气关系的影响尚不清楚.

研究的目的:

研究基线神经元活动的变化如何影响大脑组织氧气 (PO2) 和血液动力学反应 (fMRI) 之间的关系.
描述麻醉对大脑氧气-血液动力学合的作用.

主要方法:

在清醒状态下对刺激引起的PO2和BOLD反应进行比较,与异氨酸麻醉状态下进行比较.
在不同的神经元活动水平下测量组织PO2和BOLD信号.

主要成果:

在清醒状态下观察到刺激引起的PO2和BOLD反应之间存在强烈的相关性.
引起的PO2和BOLD反应在低剂量异氨酸麻醉下持续存在,但大小降低和关系扭曲.
麻醉,即使是低剂量,也会损害大脑组织氧气的反机制,以及BOLD和PO2之间的相关性.

结论:

麻醉会扭曲BOLD信号和组织氧气水平 (PO2) 之间的关系.
即使是低剂量的麻醉剂也会损害氧-血液动力学合和大脑中的调节反机制.

关键词:

大胆的回应.大脑组织的氧化,脑组织的氧化.麻醉 anesthesia 这是一种麻醉.

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