Simultaneous estimation of filtration variables in isolated rat lungs in zone 3 conditions.

Simultaneous estimation of filtration variables in isolated rat lungs in zone 3 conditions.
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在 3 区条件下同时估计离体大鼠肺部的过滤变量。

DOI:
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发表时间:
1996
影响因子:
2.2
通讯作者:
S. Fujimura
S. Fujimura
中科院分区:
医学4区
文献类型:
--
作者:
T. Tanita;K. Koike;S. Ono;S. Fujimura

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过滤变量(过滤系数、微血管周围压力和反射系数)的估计对于评估肺微血管对液体的通透性非常重要,特别是当肺部发炎、受伤或保留用于移植时。在这里,我们报告了一种在 3 区条件(肺动脉压 > 肺静脉压 > 肺泡压)下同时估计离体大鼠肺叶过滤变量的新方法。我们使用含有 6% 牛血清白蛋白的 Krebs-Henseleit 溶液作为灌注液,并使用恒压回路系统维持灌注。肺静脉压和肺泡压分别保持在2.5和2.0 cmH2O,并设定肺动脉压以使肺重量不发生变化。然后我们将肺动脉压和静脉压同时增加3 cm H2O,并记录体重增加。接下来,我们用 Krebs-Henseleit 溶液将灌注液稀释至原始浓度的一半左右,并记录体重增加。使用 Starling 方程,我们获得的过滤变量值为过滤系数,5.3 毫克。分钟-1.cmH2O-1.g-1;微血管周围压力,1.1 cmH2O;反射系数,0.54。这些值与之前报告中的值一致。由于这 3 个过滤变量是相互关联的,因此这种同时测量的方法比独立测量更准确。该方法的优点是不需要直接测量间质压力或收集淋巴液。我们需要计算这些过滤变量的是灌注液的初始过滤率和白蛋白渗透压。
Estimation of filtration variables (filtration coefficient, perimicrovascular pressure, and reflection coefficient) is important for evaluating pulmonary microvascular permeability to fluids, especially when the lungs are inflamed, injured, or being preserved for transplantation. Here we report a new method for estimating filtration variables simultaneously in isolated rat lung lobes in zone 3 conditions (pulmonary arterial pressure > pulmonary venous pressure > alveolar pressure). We used Krebs-Henseleit solution containing 6% bovine serum albumin for the perfusate and maintained perfusion using a constant-pressure circuit system. Pulmonary venous and alveolar pressures were kept at 2.5 and 2.0 cmH2O, respectively, and pulmonary arterial pressure was set so that lung weight did not change. Then we increased both pulmonary arterial and venous pressures by 3 cm H2O simultaneously, and recorded the weight gain. Next, we diluted the perfusate with Krebs-Henseleit solution to about half the original concentration, and recorded the weight gain. Using the Starling equation, the values we obtained for the filtration variables were filtration coefficient, 5.3 mg. min-1.cmH2O-1.g-1; perimicrovascular pressure, 1.1 cmH2O; reflection coefficient, 0.54. These values agree with values from previous reports. Since these 3 filtration variables are interrelated, this method for simultaneous measurement is more accurate than independent measurements are. The advantages of this method are that it does not require direct measurement of interstitial pressure or collection of lymph fluid. What we need to calculate these filtration variables are the initial filtration rates and the albumin osmotic pressures for perfusate.
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DOI: 10.1152/jappl.1990.69.5.1657
发表时间: 1990
期刊: Journal of applied physiology (Bethesda, Md. : 1985)
影响因子: --
作者:
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发表时间: 1991
期刊: Journal of applied physiology (Bethesda, Md. : 1985)
影响因子: --
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DOI: 10.1152/jappl.1988.65.5.2164
发表时间: 1988
期刊: Journal of applied physiology (Bethesda, Md. : 1985)
影响因子: --
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通讯作者: Taylor,AE
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DOI: 10.1152/jappl.1988.65.1.337
发表时间: 1988
期刊: Journal of applied physiology (Bethesda, Md. : 1985)
影响因子: --
作者:
Tanita,T;Onizuka,M;Staub,NC
通讯作者: Staub,NC