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Hydromechanical principle of the different actions of the intrathoracic pressure changes on the two venous return systems
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- Author:
- No author available
- Journal Title:
- JOURNAL OF THE FOURTH MILITARY MEDICAL UNIVERSITY
- Issue:
- 20
- DOI:
- 10.3321/j.issn:1000-2790.2002.20.004
- Key Word:
- 呼吸;心功能;静脉回流
Abstract： 目的研究胸压变化对两侧静脉回流影响不同的力学原理. 方法用模拟两个静脉回流系统与胸腔解剖位置关系的模型,观察模拟胸压变化对两个系统的不同影响,探讨其力学原理,提出假说,并以此分析临床和实验观察所遇到的与呼吸周期相关的血流动力学现象. 结果模拟实验显示,同样的胸压变化对两侧静脉回流的影响不同,它不影响右心内压,而使其容积随呼吸周期改变,但却周期性地改变左心内压而不直接影响其容积. 结论这种不同影响的发现使我们能够提出一个关于呼吸影响心功能机制的新假说,即:呼吸引起的胸压变化,实际上加载到了房室间隔的左侧,使之趋于随呼吸左右摆动,通过改变左右心的充盈容积,使两侧静脉回流和心功能呈反时相的、周期性变化.
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