瑞马唑仑联合胸交感神经阻滞对心肌缺血再灌注大鼠的保护作用  

The protective effect of remimazolam combined with thoracic sympathetic nerve block on myocardial ischemia/reperfusion rats

作　　者：樊腾[1] 李晓芳[1] 沈丹 张红伟[1] 岳修勤[1] FAN Teng;LI Xiaofang;SHEN Dan;ZHANG Hongwei;YUE Xiuqin(Department of Anesthesiology and Perioperative Medicine,the First Affiliated Hospital of Xinxiang Medical College,Xinxiang,Henan 453100,China)

机构地区：[1]新乡医学院第一附属医院麻醉与围术期医学科,河南省新乡市453100

出　　处：《中国动脉硬化杂志》2024年第11期955-962,共8页Chinese Journal of Arteriosclerosis

基　　金：新乡医学院第一附属医院青年培育基金项目(QN-2022-B05);河南省医学教育研究项目(WjLx2021358)。

摘　　要：[目的]探究瑞马唑仑(Re)联合胸交感神经阻滞(TSNB)对心肌缺血再灌注(MI/R)大鼠的保护作用。[方法]将大鼠随机分为对照组、MI/R组、Re组、TSNB组和Re+TSNB组,每组12只。除对照组外,其余大鼠采用冠状动脉左前降支(LAD)结扎术构建MI/R模型。Re组在大鼠缺血前30 min腹腔注射20 mg/kg的Re;TSNB组在大鼠缺血前30 min在胸段硬膜外导管注射0.2%罗哌卡因50μL;Re+TSNB组在大鼠缺血前30 min腹腔注射20 mg/kg的Re并在胸段硬膜外导管注射0.2%罗哌卡因50μL;对照组和MI/R组只注射生理盐水。对各组大鼠进行心功能和梗死面积评估,HE染色、TUNEL染色观察心肌组织病理改变和心肌细胞凋亡,检测血清心肌损伤标志物肌酸激酶(CK)、天门冬氨酸氨基转移酶(AST)、心肌肌钙蛋白(cTnI)水平及心肌组织炎症因子白细胞介素8(IL-8)、肿瘤坏死因子α(TNF-α)和氧化应激因子丙二醛(MDA)、超氧化物歧化酶(SOD)水平,免疫印迹法检测心肌组织IL-8、TNF-α、B淋巴细胞瘤2相关X蛋白(Bax)和B淋巴细胞瘤2(Bcl-2)蛋白表达水平。[结果]与对照组相比,MI/R组大鼠心肌细胞水肿,心肌纤维紊乱,左心室发展压力(LVDP)、最大左心室压上升速率(+dp/dt_(max))和最大左心室压下降速率(-dp/dt_(max))、SOD活性、Bcl-2水平显著降低,心肌梗死面积、细胞凋亡率、cTnI、CK、AST、IL-8、TNF-α、MDA、Bax水平显著升高(均P<0.05);与MI/R组相比,Re组、TSNB组、Re+TSNB组大鼠心肌纤维和心肌细胞形态明显改善,LVDP、±dp/dt_(max)、SOD活性、Bcl-2水平显著升高,心肌梗死面积、细胞凋亡率、cTnI、CK、AST、IL-8、TNF-α、MDA、Bax水平显著降低(均P<0.05);相比于Re组和TSNB组,Re+TSNB组LVDP、±dp/dt_(max)、SOD活性、Bcl-2水平显著升高,心肌梗死面积、细胞凋亡率、cTnI、CK、AST、IL-8、TNF-α、MDA、Bax水平明显降低(均P<0.05)。[结论]Re联合TSNB可能通过减少心肌细胞凋亡,抑制炎症反应和氧化应激,对MIAim To investigate the protective effect of remimazolam(Re)combined with thoracic sympathetic nerve block(TSNB)on myocardial ischemia/reperfusion(MI/R)rats.Methods Rats were randomly separated into control group,MI/R group,Re group,TSNB group,and Re+TSNB group,with 12 rats in each group.Except for the control group,the remaining rats were subjected to left anterior descending coronary artery(LAD)ligation to construct an MI/R model.In the Re group,20 mg/kg Re was intraperitoneally injected 30 min before ischemia.In TSNB group,0.2%ropivacaine 50μL was injected into the thoracic epidural catheter 30 min before ischemia.In the Re+TSNB group,20 mg/kg Re was intraperitoneally injected and 0.2%ropivacaine 50μL was injected into the thoracic epidural catheter 30 min before ischemia.The control group and MI/R group were injected with normal saline only.Rats in each group were evaluated for cardiac function and infarct size.HE staining and TUNEL staining were applied to observe pathological changes in myocardial tissue and myocardial cell apoptosis.Serum myocardial injury markers creatine kinase(CK)and aspartate transaminase(AST),cardiac troponin(cTnI),myocardial inflammatory factors interleukin-8(IL-8),tumor nec-rosis factor-α(TNF-α),and oxidative stress factors malondialdehyde(MDA),superoxide dismutase(SOD)were detec-ted.Western blot was applied to detect the expression of IL-8,TNF-α,B lymphoblastoma-2-associated X protein(Bax),and B-lymphoblastoma-2(Bcl-2)in myocardial tissue.Results Compared with the control group,the myocardial cells of rats showed edema and myocardial fiber disorder in the MI/R group,the left ventricular developmental pressure(LVDP),maximal left ventricular pressure rising rate(+dp/dt_(max)),maximal left ventricular pressure decreasing rate(-dp/dt_(max)),SOD activity,and level of Bcl-2 were significantly reduced,the myocardial infarction area,cell apoptosis rate,levels of cTnI,CK,AST,IL-8,TNF-α,MDA,and Bax were increased(P<0.05).Compared with the MI/R group,the morphology of myocardial fibers a

关 键 词：瑞马唑仑 胸交感神经阻滞 心肌缺血再灌注 心肌细胞凋亡 氧化应激 

分 类 号：R5[医药卫生—内科学]