简介：预适应（preconditioning，PC）现象是1986年由Murry等首先报道的狗的一种心肌自我保护机制。是指预先给予短暂的几次非致死性缺血，可以提高心肌对后续的长时间的缺血及再灌注损伤的耐受性，这种现象称为缺血预适应（ischemiapreconditioning，IPC）。随后这种现象在猫、鼠、猪、羊等不同的动物中观察到，在人冠心病患者中同样也得到证实。由于这种现象具有明显的临床价值，遂成为了近年来的研究热点。

简介：ObjectivesToexploretheprotectiveeffectofirbesartan(Irb)undertheinterferencewithangiotensinⅡ(AngⅡ)onABCA1.MethodsElectronmicroscopywasusedtodetectthemorphousoffoamcells.TheexpressionofABCA1mRNAanditsproteinweredeterminedbyRT-PCRandWesternblotting,respectively.Thevarianceofcellularcholesterolcontentwasmeasuredbyzymochemistryvia-fluorospectrophotometer.ResultsApositivefacilitativeeffectofAngⅡontheformationoffoamcellswasobserved.TotalcholesterolwasincreasedsignificantlybyAngⅡ,theexpressionofABCA1wasdown-regulatedobviouslybyAngⅡ;IrbcouldprotectABCA1againstthelesionofAngⅡ;TotalcellularcholesterolcontentwasreducedsignificantlyinIrb+AngⅡgroup;However,considerablealterationaboutthecholesterolcontentandtheexpressionofABCA1werenotobservedinIrbgroupwithoutincubationwithAngⅡ.ConclusionsIrbcouldprotectABCA1againstthelesionofAngⅡ,whichmaycontributetoitsanti-atheroscleroticproperties.

简介：ObjectivesToinvestigatetheeffectofGαq/11signalingpathwayandATP-sensitivepotassiumchannel(KATPchannel)onischemicpreconditioning(IPC)protectioninrathearts.MethodsTwoseriesofexperimentswereperformedinWistarrathearts.Inthefirstseriesofexperiment,ischemicpreconditioningwasinducedbyleftanteriordescendingocclusion(three,5minepisodesseparatedby5minofreperfusion),ischemia-reperfusioninjurywasinducedby30mincoronaryarteryocclusionfollowedby90minreperfusion.Hemodynamics,infarctsizeandscoresofventriculararrhythmiasweremeasured.TheexpressionofGαq/11proteinintheheartwasmeasuredbyWesternblotanalysisinthesecondseries.ResultsIschemicpreconditioningratsshoweddecreasedinfarctsizeandscoresofventriculararrhythmiavsnon-IPcontrolrats.TheeffectofIPCwassignificantlyattenuatedbyglibenclamide(1mg/kg,ip),anonselectiveKATPchannelinhibitor.IPCcausedasignificantincreaseintheexpressionofGαq/11protein.ConclusionsActivationsofGαq/11signalpathwayandKATPchannelplayedsignificantrolesintheclassicalcardioprotectionofischemicprecon-ditioningratheartandmightbeanimportantmechanismofsignaltransductionpathwayduringtheischemicpreconditioning.

简介：目的观察不同剂量的ATP终止不同年龄组阵发性室上性心动过速（PSVT）时复律时间、长间歇及其副作用。方法以静脉给药，将56例随机分为青年组（A组）、中年组（B组）和老年组（C组）。结果56例PS—VT全部中止．各组复律时间无差异。结论C组长间歇延长、副作用和剂量有关，C组用量宜从最低剂量开始。

简介：成人高胆固醇血症的检测、评价和治疗专题组的第三次报告(AdultTreatmentPanelⅢ,ATPⅢ)制定了国家胆固醇教育计划(NECP)新的胭固醇检测和处理临床指南。ATPⅢ在保持对冠心病患者强化治疗关注的同时,其主要新的特点是