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维生素E预处理对心肌缺血/再灌注损伤大鼠血流动力学的影响

陈玲玲,彭贵海,王崇全   

  1. 湖北医药学院附属太和医院心内科,湖北医药学院附属太和医院心内科,湖北医药学院附属太和医院心内科
  • 收稿日期:2018-04-12 修回日期:2018-05-31 出版日期:2018-06-25

The Impact of Vitamin E Preconditioning on the Hemodynamics of Rats With Myocardial Ischemia/Reperfusion Injury

CHEN Lingling,PENG Guihai and WANG Chongquan   

  1. Taihe Hospital affiliated to Hubei University of Medicine,湖北医药学院附属太和医院心内科,湖北医药学院附属太和医院心内科
  • Received:2018-04-12 Revised:2018-05-31 Online:2018-06-25

摘要: 目的:探讨维生素E(Vit E)预处理对心肌缺血/再灌注损伤(MI/RI)大鼠血流动力学的影响。方法:选取健康SD大鼠60只,按照随机数字表法,随机分为Sham组、MI/RI组、Vit E组,每组各20只。Vit E组在造模前两周开始,肌注Vit E注射液4.5 mg·kg-1·d-1,另两组术前肌注生理盐水4.5 mg·kg-1·d-1,均连续给药2周。MI/RI组、Vit E组在平左心耳下缘下2 mm处结扎左冠脉前降支(LAD),30 min后松解结扣再灌注120 min,复制MI/RI模型;Sham组只用丝线穿过LAD,不结扎。结果:与MI/RI组比较,Vit E组大鼠超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)活性升高,丙二醛(MDA)含量降低,差异均有统计学意义(P<0.05);MI/RI组肌钙蛋白Ⅰ(cTnI)(ng·mL-1)、心钠素(ANP)(ng·L-1)分别为(6.57±2.45)、(282.79±24.87),与Vit E组(4.51±2.06)、(254.68±20.84)比较,后者均降低(P<0.05); t3时,Vit E组心率(HR)(次·min-1)、左心室收缩末期压力(LVESP)(mmHg)、左心室舒张末期压力(LVEDP)(mmHg)、心室内最大压力上升速率(+dp/dt max)(mmHg·s-1)、心室内最大压力下降速率(-dp/dt max)(mmHg·s-1)分别为(331.9±30.1)、(91.7±15.1)、(1.1±1.8)、(525±195)、(399±169),与MI/RI组(308.9±32.8)、(77.1±12.5)、(3.3±2.7)、(319±140)、(336±197)比较均有所改善,两者差异均有统计学意义(P<0.05)。结论:Vit E预处理可以对抗心肌缺血/再灌注损伤,改善MI/RI大鼠血流动力学指标,从而保护MI/RI心肌细胞的结构和舒缩功能。

Abstract: Objective:To explore the impact of vitamin E(Vit E) preconditioning on the hemodynamics of rats with myocardial ischemia/reperfusion injury(MI/MR). Methods: 60 healthy SD rats were selected and divided into the Sham group, MI/MR group, and Vit E group in accordance with the method of random number table, with 20 rats in each group. Two weeks before the building of models, the Vit E group started to intramuscular inject with Vit E injection 4.5 mg·kg-1·d-1, the other two groups started to intramuscular inject with the normal saline 4.5 mg·kg-1·d-1, and continued 2 weeks. The left anterior descending branch of coronary artery was occluded at 2 mm under the bottom edge of the flat left atrial appendage for MI/RI group and Vit E group, loosen the knot after 30 min and fill with another 120 min, copying the MI/RI model. Use the silk wire to get through LAD for Sham group, it should not be occluded. Results: Compared with MI/RI group, the activity of SOD, GSH-Px of the rats in Vit E group was apparently increased, the content of MDA was decreased(P<0.05). cTnI(ng·mL-1), ANP(ng·L-1) of MI/RI group were (6.57±2.45), (282.79±24.87) respectively, compared with (4.51±2.06), (254.68±20.84) for Vit E group, the latter one was decreased (P<0.05). At t3, HR(time·min-1), LVESP(mmHg), LVEDP(mmHg), +dp/dt max(mmHg·s-1), -dp/dt max(mmHg·s-1) of Vit E group are (331.9±30.1), (91.7±15.1), (1.1±1.8), (525±195), (399±169) respectively, compared with (308.9±32.8), (77.1±12.5), (3.3±2.7), (319±140), (336±197) of MI/RI group, the index were improved, the difference was statistically significant(P<0.05). Conclusion:Vit E preconditioning may improve the index of hemodynamics of rats with myocardial ischemia/reperfusion injury to protect the structure and systolic and diastolic function of the cardiocyte with MI/RI.