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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Tissue remodeling of rat pulmonary arteries in recovery from hypoxic hypertension.
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Tissue remodeling of rat pulmonary arteries in recovery from hypoxic hypertension.

机译:从低氧性高血压中恢复大鼠肺动脉的组织重塑。

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The reversibility of tissue remodeling is of general interest to medicine. Pulmonary arterial tissue remodeling during hypertension induced by hypoxic breathing is well known, but little has been said about the recovery of the arterial wall when the blood pressure is lowered again. We hypothesize that tissue recovery is a function of the oxygen concentration, blood pressure, location on the vascular tree, and time. We measured the changes of blood pressure, vessel lumen, vessel wall thicknesses, and opening angle of each segment of the blood vessel at its zero-stress state after step changes of the oxygen concentration in the breathing gas. The zero-stress state of each vessel is emphasized because it is important to the analysis of stress and strain and in morphometry. Experimental results are presented as histories of tissue parameters after step changes of the oxygen level. Tissue characteristics are examined under the hypothesis that they are linearly related to changes in the local blood pressure.Under this linearity hypothesis, each aspect of the tissue change can be expressed as a convolution integral of the blood pressure history with a kernel called the indicial response function. It is shown the indicial response function for rising blood pressure is different from that for falling blood pressure. This difference represents a major nonlinearity of the tissue remodeling process of the blood vessels.
机译:组织重塑的可逆性是医学普遍关注的。由低氧呼吸引起的高血压期间的肺动脉组织重塑是众所周知的,但是关于再次降低血压时动脉壁恢复的说法很少。我们假设组织恢复是氧气浓度,血压,在血管树上的位置和时间的函数。我们测量了在呼吸气体中的氧气浓度逐步变化后,在零应力状态下,每个部分的血压,血管腔,血管壁厚度和张开角的变化。强调每个容器的零应力状态,因为它对于应力和应变分析以及形态测量很重要。实验结果表示为氧水平逐步变化后组织参数的历史记录。在组织特征与局部血压变化呈线性相关的假设下检查组织特征。在此线性假设下,组织变化的每个方面都可以表示为血压历史的卷积积分与被称为“个体反应”的核功能。结果表明,血压升高的个体响应函数与血压降低的个体响应函数不同。该差异表示血管的组织重塑过程的主要非线性。

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