在有或没有动脉巴罗反射控制的外源性压力扰动期间尿液的短期动态特征
Toru Kawada1, Hiroki Matsushita1, Shohei Yokota1
1Department of Cardiovascular Dynamics, National Cerebral and Cardiovascular Center, Osaka, Japan.
概括
脏是脏的组成部分.
科学领域:
- 身体生理学 身体生理学
- 脏生理学 脏生理学
- 心血管生理学心血管生理学
背景情况:
- 功能对于长期的动脉压 (AP) 调节至关重要.
- 尿流 (UF) 对短期AP变化的动态反应尚未完全理解.
- 神经介导的抗利尿症 (NMA) 和压力利尿症 (PD) 是影响UF的关键机制.
研究的目的:
- 量化尿流 (UF) 对快速动脉压 (AP) 波动的反应的动态特征.
- 为了区分压力利尿症 (PD) 和神经介导抗利尿症 (NMA) 对UF调节的贡献.
- 分析体积控制在不同巴罗反射条件下的时间动态.
主要方法:
- 利用白噪声分析扰乱麻醉大鼠 (n=8) 中的平均AP,每10秒间达到60至100mmHg.
- 在一个巴罗-on试验 (完整的巴罗反射) 和一个巴罗-固定试验 (固定的大脑动脉鼻压力) 中比较了UF反应.
- 以两个指数式衰变函数的总和来建模 UF 步骤响应,以确定时间常数和增益.
主要成果:
- UF反应表现出快速 (时间常数~6.5秒) 和缓慢 (时间常数~102秒) 的组成部分.
- 缓慢组件的增益在巴罗-试验中明显大于巴罗-固定试验 (P=0.023).
- 神经介导抗尿路症 (NMA) 对整体UF反应贡献了约32%,主要影响缓慢成分.
结论:
- 神经介导的抗尿路症 (NMA) 显著促进了尿流对动脉压变化反应的缓慢成分.
- 脏对体液体积的动态调节包括对动脉压变化的快速和缓慢反应.
- 了解这些动态对于理解整体心血管平衡和液体平衡至关重要.
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