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Anesthesiology:逐渐性增加潮气量可减轻大鼠实验性肺损伤

2019-06-30 佚名 罂粟花

对于轻度急性呼吸窘迫综合征,高潮气量(VT)可产生一定程度的肺损伤;本研究假设如果VT缓慢增加,可减少机械异质性并使肺泡上皮细胞和内皮细胞以及细胞外基质产生适应性,则肺损伤可以减轻。故本研究本研究旨在探讨逐渐增加潮气量的不同方式对大鼠实验性肺损伤的影响 。

背景与目的

对于轻度急性呼吸窘迫综合征,高潮气量(VT)可产生一定程度的肺损伤;本研究假设如果VT缓慢增加,可减少机械异质性并使肺泡上皮细胞和内皮细胞以及细胞外基质产生适应性,则肺损伤可以减轻。故本研究本研究旨在探讨逐渐增加潮气量的不同方式对大鼠实验性肺损伤的影响 。

方  法

64只Wistar大鼠气管内注射大肠杆菌脂多糖,制备急性呼吸窘迫综合征模型。 24小时后,随机分为四组,并进行机械通气:对照组:VT=6ml/kg,持续2h;无适应时间组:第1小时VT=6ml/kg,第2小时VT突然增加至22ml/kg;短适应时间组:前30分钟内VT为6ml/kg,随后30分钟内VT逐渐增加至22ml/kg,然后在第2小时内VT恒定为22ml/kg; 长适应时间组:在第1小时,VT从6ml/kg增加到22ml/kg,在第2小时,VT恒定为22ml/kg。所有动物均接受3cmH2O的呼气末正压通气,分子生物学技术检测相关分子指标。

结 果

2 h时,长适应时间组弥漫性肺泡损伤评分和异质性指数较对照组及短适应时间组高;长适应时间组白细胞介素-6的表达较对照组及短适应时间组表达水平多(长适应时间组:76.7[20.8–95.4];短适应时间组12.4[9.1–17.8]:;对照组:65.5[18.1–129.4;p=0.02.);双调蛋白、基质金属蛋白酶-9、细胞分泌蛋白-16和多配体蛋白聚糖表达在各组间与前述一致。

结 论

在实验性轻度急性呼吸窘迫综合征大鼠模型,与无适应时间组相比,短适应时间组的肺损伤可通过肺泡上皮细胞和细胞外基质的方式得以减轻;延长适应期可增加累积能量,但不能防止肺损伤。

原始出处:

Nathane S. Felix, Cynthia S. Samary,Fernanda F.Cruz,et al. Gradually Increasing Tidal Volume May Mitigate Experimental Lung Injury in Rats;Anesthesiology 2019; 130:767–77.

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    2019-10-13 lujian
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    2019-07-02 tastas
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    2019-07-02 skhzy
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    2019-07-01 百草

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