胸主动脉阻断联合主动脉旁路循环技术建立大鼠脊髓缺血损伤模型

杨克; 费俊杰; 段玉印; 李鑫; 吴忠诚; 黄莹山

doi:10.12259/j.issn.2095-610X.S20220217

胸主动脉阻断联合主动脉旁路循环技术建立大鼠脊髓缺血损伤模型

doi: 10.12259/j.issn.2095-610X.S20220217

1.
云南省阜外心血管病医院麻醉科，云南昆明　650032
2.
四川省成都市第三人民医院心脏大血管外科，四川成都　610000
3.
云南省阜外心血管病医院心外科，云南昆明　650032

基金项目: 云南省应用基础研究基金资助项目（2017FE468-192）

详细信息

作者简介:
杨克（1981～），男，山西霍州人，硕士，主要从事麻醉学、围术期器官保护研究工作

通讯作者:
段玉印，E-mail：duanyuyin@kmmu.edu.cn

中图分类号: R744.1
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出版历程
- 收稿日期: 2021-12-07
- 网络出版日期: 2022-02-24
- 刊出日期: 2022-03-04

Establishment of Spinal Cord Ischemia Injury Model in Rats by Thoracic Aorta Occlusion Combined with Aortic Bypass

1.
Dept. of Anesthesiology，Yunnan Fuwai Cardiovascular Hospital，Kunming Yunnan 650032
2.
Dept. of Cardio-Vascular Surgery，The Third People’s Hospital of Chengdu，Chengdu Sichuan 610000
3.
Dept. of Cardiology，Yunnan Fuwai Cardiovascular Hospital， Kunming Yunnan 650032，China

摘要

摘要: 目的改良大鼠脊髓缺血损伤动物模型。方法大鼠分为3组：实验组，阻断胸主动脉（T4-T11）+主动脉旁路循环（胸主动脉起始部-胸主动脉近膈肌部），阻断20 min；对照组，阻断胸主动脉（T4）20 min；假手术组，只开胸不阻断胸主动脉。术中采用经颅运动诱发电位（Tc-MEP）监测脊髓功能，术后7 d观察脊髓切片病理改变；采用BBB评分评估脊髓功能，28 d分析大鼠生存曲线。结果实验组Tc-MEP波形6 min后消失，对照组8 min后Tc-MEP波形消失，直至手术结束。脊髓切片显示实验组神经元大量变性坏死，对照组多个神经元坏死。实验组比对照组BBB评分下降明显；28 d生存率差异有统计学意义（P < 0.05）。结论胸主动脉阻断+主动脉旁路循环方法，对比传统的胸主动脉阻断方法，效果确切，存活率高。
- 脊髓缺血损伤 /
- 动物模型 /
- 主动脉旁路循环 /
- 主动脉阻断
Abstract: Objective To modify the rat model of spinal cord ischemia injury. Methods The rats were divided into three groups. In experimental group, thoracic aorta was cross-clamped between T4 and T11, and aortic bypass circulation was established from proximal thoracic aorta to proximal diaphragmatic aorta. The interval of clamping was 20 minutes. In control group, the thoracic aorta （T4） was cross-clamped for 20 minutes.In the sham operation group, only thoracotomy was performed without thoracic aorta cross-clamping. Thefunction of spinal cord was monitored by transcranial motor evoked potential （TC-MEP）. The pathology of spinal cord were observed 7 days after surgery. The locomotor function of spinal cord was evaluated by BBB score at multiple postoperative time. The survival curves were analyzed 28 days after operation. Results The TC-MEP waveform of the experimental group disappeared after 6 minutes, and that of the control group disappeared after 8 minutes until the end of surgery. The slices of spinal cord showed a large number of degeneration and necrosis of neurons in the experimental group. Multiple neurons were necrotic in the control group. The BBB score of the experimental group decreased more obviously than that of the control group. There was a significant difference in the 28-day survival rate between the experimental group and the control group, and （P < 0.05）. Conclusion Thoracic aortic cross-clamping plus aortic bypass is an effective method, with high long-term survival rate.
- Spinal cord ischemia injury /
- Animal model /
- Aortic bypass /
- Aortic cross-clamping

HTML全文

图 1 胸主动脉阻断+主动脉旁路循环示意图

在胸主动脉阻断期间，旁路管道向远端主动脉供血。

Figure 1. Schematic diagram of thoracic aorta cross-clamping + aortic bypass

下载: 全尺寸图片幻灯片

图 2 在胸主动脉阻断后Tc-MEP波形消失，表明脊髓功能损伤。

Figure 2. The TC-MEP waveform disappeared after thoracic aorta cross-clamping，indicating impaired spinal function.

下载: 全尺寸图片幻灯片

图 3 BBB运动评分折线图，实验组与对照组比较，差异有统计学意义。

^*P < 0.05，^**P < 0.01，^***P < 0.001，^****P < 0.0001。

Figure 3. Line chart of BBB locomotor scores of rats. There was significant difference between treatment and controlgroup.

下载: 全尺寸图片幻灯片

图 4 术后7 d大鼠胸段脊髓的组织学改变（HE染色）（×200）

A：假手术组，组织学正常；B：对照组，神经元数量减少，炎症细胞浸润；C：实验组，少量神经元存活，炎性细胞浸润。

Figure 4. Histological changes of the thoracic spinal cord in rats 7 days after surgery （HE staining）（×200）

下载: 全尺寸图片幻灯片

图 5 28 d生存率比较

Kaplan-Meier生存曲线，Log Rank检验，实验组与对照组有显著性差异，^*P = 0.0412。

Figure 5. Comparison of 28-day overall survival rate （Kaplan-Meier survivalcurve，Log Rank test）

下载: 全尺寸图片幻灯片

参考文献(12)

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[8]	Bell M T,Reece T B,Smith P D,et al. Reproducable paraplegia by thoracic aortic occlusion in a murine model of spinal cord ischemia-reperfusion[J]. J Vis Exp,2014,85:50910.
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