在患有自主性衰竭的患者中,在渐进性低血压期间脑血管合规性
Leena N Shoemaker1,2, Aleena Sajid1, Ronald Schondorf3
1School of Kinesiology, Western University, London, Ontario, Canada.
Journal of applied physiology (Bethesda, Md. : 1985)
|January 15, 2025
概括
在自主性衰竭患者下降动脉血压 (ABP) 时,脑血管合规性 (Ci) 增加,但仅在超过特定值后. 这种保护机制有助于在低血压期间维持大脑血流.
科学领域:
- 心血管生理学心血管生理学
- 脑血管调节 脑血管调节
- 自主神经系统功能 自主神经系统功能
背景情况:
- 大脑血管可以通过在降低动脉血压 (ABP) 期间增加服从来保护大脑输液.
- 脑血管合规度 (Ci) 随着血压下降而上升的门尚不清楚.
研究的目的:
- 调查大脑血管合规性 (Ci) 与动脉血压 (ABP) 降低的增加是否在自主性衰竭 (AF) 患者中具有值效应.
主要方法:
- 在五名AF患者中,在分级向上倾斜 (HUT) 过程中使用修改的Windkessel模型评估Ci和脑血管阻力 (CVR).
- 测量指纹动脉血压 (ABP) 和中脑动脉血速 (MCAv) 波形.
- 确定Ci增加的门,使用Ci与脉冲压 (PP) 或ABP的断点分析.
主要成果:
- 分级HUT逐渐降低了ABP,PP,CVR和平均MCAv,同时增加了Ci (P<0.01).
- 在脉冲压 (PP) 下降了22±6 mmHg和ABP下降了20±11 mmHg之后,脑血管合规性 (Ci) 开始逐渐增加.
- 的增加表现为值效应,并且随着ABP继续下降而持续存在.
结论:
- 在逐渐低血压期间脑血管顺应 (Ci) 的增加在自主性衰竭患者中表现出值效应.
- 这种值现象表明,在AF患者的低血压期间,持续的大脑输液的保护机制存在.
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