Crit Care Med:肥胖患者递减的呼气末正压试验期间跨肺压可以预测肺形态!

2017-04-19 xing.T MedSci原创

由此可见,在肥胖患者中,低到负值的跨肺压可以预测肺塌陷和明显的肺复张。肺复张前进行一个递减的呼气末正压试验可逆转肺不张,改善肺通气和氧合,且不增加肺血管阻力。

严重肥胖的重症患者在接受机械通气时因胸腔压力增高而容易发生肺不张。近日,危重病医学领域权威杂志Critical Care Medicine上发表了一篇研究文章,研究人员旨在明确跨肺压、肺力学和肺组织的形态学之间的相关性,并且定量肺复张前递减的呼气末正压试验的益处。

该研究采用前瞻性、交叉、非随机干预性研究,是在马萨诸塞州总医院(波士顿马萨诸塞州)的医疗和外科重症监护病房内和大学动物研究实验室(巴西圣保罗)完成的。受试者为危重急性呼吸衰竭的肥胖患者和麻醉猪。研究人员分析了16例机械通气危重疾病的肥胖患者的临床资料,并且建立了可逆性肺不张的肥胖动物模型,通过在10头猪的腹部放置充液袋以模拟肺力学、肺形态和肺血流动力学的变化。

在肥胖患者(体重指数为48±11公斤/平方米)中,21.7±3.7 cmH2O呼气末正压在肺复张和递减的呼气末正压后产生的呼吸系统弹性最低(18.6±6.1 cmH2O/L),并且对应的有一个呼气末跨肺正压(2.1 ±2.2cmH2O)。在最低弹性时进行通气,呼气末正压会早于肺复张恢复呼气末肺通气量(30.4±9.1ml/kg理想体重)和氧合(273.4±72.1mmHg)。在猪模型中,当呼气末跨肺正压低于2-4cmH2O时,会出现肺萎陷。发生肺不张后,递减的呼气末正压试验可以早于肺复张确定呼气末正压水平(17.4±2.1cmH2O),但需要恢复充气不佳的肺组织,重建肺顺应性和氧合,而避免增加肺血管阻力。

由此可见,在肥胖患者中,低到负值的跨肺压可以预测肺塌陷和明显的肺复张。肺复张前进行一个递减的呼气末正压试验可逆转肺不张,改善肺通气和氧合,且不增加肺血管阻力。

原始出处:


Fumagalli, Jacopo, et al. Transpulmonary Pressure Describes Lung Morphology During Decremental Positive End-Expiratory Pressure Trials in Obesity.Critical Care Medicine.2017.http://journals.lww.com/ccmjournal/Abstract/publishahead/Transpulmonary_Pressure_Describes_Lung_Morphology.96641.aspx

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    2017-04-21 gospel007

    学习了。

    0

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    2017-04-20 1ddf3e1dm99(暂无匿称)

    学习了,谢谢

    0

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    2017-04-19 ideal肿瘤医

    学习了,肺形态

    0

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