家兔急性心肌梗死后心室颤动模型制作#卢俊宇1,3,谢露2,陈蒙华1**(1.广西医科大学第一附属医院西院ICU;510152025303540452.广西医科大学基础医学院生理教研室;3.广西壮族自治区人民医院急诊科)摘要:目的:探索建立家兔心肌梗死后心室颤动(简称室颤)模型,验证在缺血条件下应用交流电刺激是否增加持续性室颤的发生率。方法:选取健康家兔36只,随机分为缺血组(开胸结扎冠脉)、非缺血组(开胸不结扎冠脉)和对照组(不开胸)。每组12只,均接受经皮交流电刺激诱发室颤。观察各组动物诱发室颤所需时间、持续性室颤的发生率、自主循环恢复率、1h生存率以及实验全程各组动物心率和血压的变化趋势。结果:开胸结扎冠脉左前降支可以记录到典型的ST段抬高型心肌梗死心电图演变图形。缺血组家兔诱发室颤所需的时间明显短于非缺血组(分别为51.25±16.25秒和68.75±25.15秒,P=0.025),缺血组、非缺血组和对照组1h生存率分别为44.4%,100%和100%。但三组间电刺激诱发持续性室颤的发生率和自主循环恢复率比较无差异。在完成开胸手术、开始诱导室颤前,缺血组和非缺血组动物的平均动脉压明显低于对照组,中心静脉压明显高于对照组;自主循环恢复后,缺血组与非缺血组和对照组比较,平均动脉压呈逐渐下降、心率和中心静脉压逐渐升高趋所势,部分时点达到统计学意义。结论:开胸结扎冠脉可以复制急性心肌梗死模型,但开胸本身也可导致家兔的低血压状态。在家兔急性心肌梗死的基础上,经体表交流电刺激容易诱发室颤,但不增加持续性室颤的发生率,也不影响早期复苏成功率。心肌梗死家兔在自主循环恢复后生存时间明显缩短的主要原因可能与心肌缺血诱发和加重复苏后心功能障碍有关。关键词:心肌梗死;心室颤动;心肺复苏;交流电;家兔:R54.RabbitventricularfibrillationinducedbypercutaneousalternatingcurrentstimulationfollowingacutemyocardialinfarctionLuJun-yu1,3,XieLu2,ChenMeng-hua1(1.Intensivecareunitinthewestsection,thefirstaffiliatedhospitalofGuangxiMedicalUniversity;2.DepartmentofPhysiology,SchoolofPre-clinicalscienceofGuangxiMedicalUniversity;3.Emergencydepartment,People'shospitalofGuangxiZhuangautonomousregion.)Abstract:Objectives:Thepurposesofthisstudyweretoproduceacardiacarrest(CA)modelofpost-acutemyocardialinfarction(AMI)inrabbits,andtoobservehowthemyocardialischemiaaffectthethresholdofventricularfibrillation(VF).Methods:36healthyrabbitswererandomizedintothecontrolgroup,non-infarctiongroupandtheinfarctiongroup,12animalsincludedeachgroup.VFwasinducedintheeachgroupbythepercutaneousalternatingcurrent(AC)stimulation.ThedurationofACstimulation,therateofsustainedVF,restorationofspontaneouscirculation(ROSC)andthesurvivalof1h,thetendencyofheartrateandbloodpressurewerecomparedinthethreegroups.Results:Aftertheleftanteriordescent(LAD)wasligatedintheinfarctiongroup,ECGshowedatypicaldynamicprocessofthemyocardialinfarction.ThetimefromthestartofACstimulationtotheCAintheinfarctiongroupwas51.25±16.25s,significantshorterthanthenon-infarctiongroupandthecontrolgroup,butnosignificantdifferenceofthedurationofVFandtherateofROSC.RabbitsshowedlowerMAPandhigherCVPinnon-infarctiongroupandtheinfarctiongroupduringthisstudy,levelsofMAPandbeatsofheartrateweredescending,levelsofCVPwereincreasedgraduallyafterROSC,whilecomparedwithcontrolgroup,respectively.Conclusion:Ligatingtheleftanteriordescent(LAD)inrabbitsviathoracotomycouldproduceamodelwithacutemyocardialinfarction(AMI).Butthethoracotomy基金项目:高等学校博士学科点专项科研基金资助课题(课题编号:20094503110006)、广西自然科学基金资助课题(2011GXNSA018174)及广西研究生创新项目(2007105981002M06)作者简介:卢俊宇(1982),男,主治医师,广西医科大学硕士,现在广西壮族自治区人民医...