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中国科技核心期刊

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中华重症医学电子杂志 ›› 2022, Vol. 08 ›› Issue (04) : 360 -366. doi: 10.3877/cma.j.issn.2096-1537.2022.04.014

基础研究

EIT在ARDS模型局部复张/过度膨胀比值监测中的应用
王玉妹1, 王岩1, 周益民1, 苗明月1, 杨燕琳1, 张琳琳1, 徐明1, 周建新1,()   
  1. 1. 100070 北京,首都医科大学附属北京天坛医院重症医学科
  • 收稿日期:2022-04-14 出版日期:2022-11-28
  • 通信作者: 周建新
  • 基金资助:
    国家自然科学基金项目(81871582)

Application of regional recruitment-to-inflation ratio monitored by electrical impedance tomography in the models of acute respiratory distress syndrome

Yumei Wang1, Yan Wang1, Yimin Zhou1, Mingyue Miao1, Yanlin Yang1, Linlin Zhang1, Ming Xu1, Jianxin Zhou1,()   

  1. 1. Department of Critical Care Medicine, Beijing Tiantan Hospital, Capital Medical University, Beijing 100070, China
  • Received:2022-04-14 Published:2022-11-28
  • Corresponding author: Jianxin Zhou
引用本文:

王玉妹, 王岩, 周益民, 苗明月, 杨燕琳, 张琳琳, 徐明, 周建新. EIT在ARDS模型局部复张/过度膨胀比值监测中的应用[J/OL]. 中华重症医学电子杂志, 2022, 08(04): 360-366.

Yumei Wang, Yan Wang, Yimin Zhou, Mingyue Miao, Yanlin Yang, Linlin Zhang, Ming Xu, Jianxin Zhou. Application of regional recruitment-to-inflation ratio monitored by electrical impedance tomography in the models of acute respiratory distress syndrome[J/OL]. Chinese Journal of Critical Care & Intensive Care Medicine(Electronic Edition), 2022, 08(04): 360-366.

目的

观察电阻抗成像技术(EIT)用于监测急性呼吸窘迫综合征(ARDS)模型局部复张/过度膨胀比值(RI ratio)的可行性。

方法

健康巴马猪6只,通过油酸静脉滴入的方法建立ARDS模型,呼气末正压(PEEP)为5 cmH2O的情况下,氧合指数<200 mmHg(1 mmHg=0.133 kPa),并稳定维持30 min,即模型建立成功。模型成功后进行一次肺复张,在PEEP 15 cmH2O(1 cmH2O=0.098 kPa)水平下通气1 h,通过慢吐气的方法将PEEP由15 cmH2O降至5 cmH2O再通气1 h,全程进行EIT监测,实验结束后进行离线分析。肺从腹侧到背侧划分为2个“感兴趣区(ROI)”,通过EIT计算复张容积(Vrec)、整体RI ratio,并计算局部的Vrec和局部的RI ratio。

结果

所有的实验动物均达到了ARDS的标准,造模后的氧合指数明显低于造模前,差异有统计学意义[(151.7±13.4)mmHg vs(422.5±49.9)mmHg,t=14.100,P<0.001]。所有实验动物的RI ratio为1.59(1.42,1.67),6只动物的整体RI ratio、非重力依赖区和重力依赖区RI ratio分别为:1.83、1.03、2.06,1.68、1.51、2.28,1.64、0.98、1.83,1.23、0.93、1.33,1.38、0.02、1.27,1.55、1.41、1.99。

结论

通过EIT监测ARDS患者的局部RI ratio,可提供更多分区复张性的信息。

Objective

To observe the application of regional recruitment-to-inflation ratio (RI ratio) monitored by electrical impedance tomography (EIT) in the models of acute respiratory distress syndrome (ARDS).

Methods

ARDS models were established by intravenous infusion of oleic acid in 6 Bama pigs. The model was considered as being successfully established when the ratio of the partial pressure of oxygen in arterial blood PaO2 to FiO2 (PaO2/FiO2) remained below 200 mmHg for at least 30 min. After the ARDS model was established, a recruitment manuver (RM) was performed. After RM, the animal was ventilated at PEEP 15 cmH2O for one hour. Then, a prolonged expiration was performed and PEEP was decreased from 15 to 5 cmH2O. The process was monitored by EIT, and offline analysis was performed after the experiment. Lung images were divided into two ventral-to-dorsal horizontal regions of interest (ROI). Recruitment volume (Vrec), global RI ratio, regional Vrec and regional RI ratio were calculated by EIT.

Results

ARDS was successfully induced in all experimental animals with median (IQR) PaO2/FiO2 decreasing from (422.5±49.9) mmHg to (151.7±13.4) mmHg (t=14.100, P<0.001). The median and interquartile range of the RI ratio of all experimental animals was 1.59 (1.42, 1.67). The global RI ratio, RI ratio of nondependent areas and dependent areas of 6 animals were 1.83, 1.03, 2.06; 1.68, 1.51, 2.28; 1.64, 0.98, 1.83; 1.23, 0.93, 1.33; 1.38, 0.02, 1.27; 1.55, 1.41, 1.99 respectively.

Conclusion

Regional RI ratio can be calculated and monitored by EIT in ARDS patients, which may provide more information on regional recruitability.

表1 所有实验动物造模前后各指标比较
表2 所有实验动物高低PEEP水平之间各指标的比较(6只)
表3 每只实验动物分区的Vrec和Crec比较(6只)
表4 每只实验动物的分区RI ratio比较(6只)
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