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Understanding Cardiac Electrophysiology and Arrhythmias了解心脏电生理及心律失常.ppt
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ponents:Thesinoatrialnode(SA)Bachmann’sbundleInternodaltractsAtrioventricularnode(AV)RightandLeftBundlebranchesPerkinjefibersVentriclesBasicelectrocardiograph(EKG)waveform:plexSTsegmentTwaveQTintervalElectricalConductionSystemoftheHeartTheheartissuppliedwithanelectricalconductionsystemthatgeneratesandconductselectricalimpulsesalongspecializedpathwaysContractionissequencespecificsotheatriacontractsbeforetheventricleandtheventriclecontractsfromapextobaseforefficientejectionofblood.PONENTSSinoatrial(SA)nodeInteratrialtract(Bachmann’sbundle)Internodaltracts,theatrioventricular(AV)nodeBundleofHisRightandleftbundlebranchesPurkinjefibers.THESINOATRIALNODE(SA)TheSAnode,locatedintheupperrightatrium,istheprimarypacemakeroftheheart(60to100beats).IftheSAnodefailstogenerateimpulsesorifthoseimpulsesareblocked,pacemakercellsinothersitescanassumecontrol,butataslowerrate.BACHMANN’SBUNDLE INTERNODALTRACTSBachmann’sbundleconductsimpulsestotheleftatrium,whiletheinternodaltractsconductimpulsestotheAVnode,locatedinthelowerRatriumneartheinteratrialseptum.ATRIOVENTRICULARNODEPrimaryfunction-ingfromtheatria,allowingtimefortheatriatocontractandemptytheircontentsintotheventricles.Itcanfunctionsasabackuppacemaker(40to60beats).Whentheatrialrateisrapid,theAVnodeblockssomeoftheimpulsesbeingconductedtotheventricles,protectingthemfromdangerouslyfastrates.RTANDLTBUNDLEBRANCHESFromtheAVnode,theelectricalimpulsemovesrapidlythroughthebundleofHisandtotheRbundlebranch(Rventricle)andLbundlebranch(Lventricle).PURKINJEFIBERSTheimpulsethenentersthePurkinjesystemwherePurkinjefibersconducttheimpulsetomyocardialcellsoftheventricle,causingventriculardepolarizationandcontraction. 内容来自淘豆网www.taodocs.com转载请标明出处.