The unusual symmetric reopening effect induced by pulmonary surfactant.

The unusual symmetric reopening effect induced by pulmonary surfactant.
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肺表面活性物质诱导的不寻常的对称重新开放效应。

DOI:
10.1152/japplphysiol.00814.2013
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发表时间:
2014
期刊:
Journal of applied physiology (Bethesda, Md. : 1985)
影响因子:
--
通讯作者:
Gaver3rd,DonaldP
Gaver3rd,DonaldP
中科院分区:
--
文献类型:
--
作者:
Yamaguchi,Eiichiro;Giannetti,MatthewJ;VanHouten,MatthewJ;Forouzan,Omid;Shevkoplyas,SergeyS;Gaver3rd,DonaldP

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本研究探讨了一指空气的稳定性,因为它传播到一个充满液体的肺分叉模型的充满液体的模型。我们试图阐明女儿气道重开的稳定性特征,这一事件可能对急性肺部疾病的治疗很重要。为此,我们研究了在接近恒定表面张力的条件下,用1)纯化的水或2)阴离子表面活性剂(十二烷基硫酸钠)重新打开的对称性。在白蛋白存在和不存在的情况下,用肺表面活性剂(Infasurf)研究动态表面张力。利用μ-PIV (microparticle image velocity metry)/shadowgraph系统实现了流动的可视化,通过该系统我们测量了1)重新打开每个子分支的空气指的传播速度,以及2)传播气泡尖端周围的液相的瞬时和平均速度场。只有肺表面活性物质显示出在子通道中维持近乎对称传播的能力,这可能导致均匀的气道重新开放。相反,当肺表面活性剂被白蛋白灭活或当系统保持在几乎恒定的表面张力时,重新开放发生不对称。我们的分析表明,Infasurf的动态表面张力质量对于稳定去除液体障碍物非常重要。这证明了肺表面活性物质在气道多分支网络重开中的重要作用。
This study investigates the stability of a finger of air as it propagates into a liquid-filled model of a liquid-filled model of a pulmonary bifurcation. We seek to elucidate the stability characteristics of the reopening of daughter airways, an event that may be important to the treatment of acute lung disease. To do so, we investigated the symmetry of reopening under conditions of nearly constant surface tension with1) purified H2O or2) an anionic surfactant (sodium dodecyl sulfate). Dynamic surface tension was investigated using pulmonary surfactant (Infasurf) with and without the presence of albumin. Flow visualization was accomplished using a microparticle image velocimetry (μ-PIV)/shadowgraph system through which we measured1) the propagation velocity of the finger of air that reopens each daughter branch, and2) the instantaneous and averaged velocity field of liquid phase surrounding the tip of the propagating bubble. Only pulmonary surfactant demonstrated the ability of maintaining a nearly symmetric propagation in the daughter channels, which is likely to lead to homogeneous airway reopening. In contrast, when pulmonary surfactant was inactivated by albumin or when the system was held at a nearly constant surface tension, reopening occurred asymmetrically. Our analysis suggests that Infasurf's dynamic surface tension qualities are important to stabilize the removal of liquid obstructions. This demonstrates a new important function of pulmonary surfactant for airway reopening of a multibranched network.
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