CHAPTER?65?VENTRICULAR?ARRHYTHMIAS
Ventriculararrhythmiasoriginatebelowtheatrioventricular(A
V)nodeintheventricularmyocardiumorHis-Purkinjesystem.Theseincludeprematureventricularbeats室性早搏,ventricularcouplets成对室早,nonsustainedandsustainedventriculartachycardias(VTs),andventricularfibrillation(VF).Thesearrhythmiasoccurinallformsofheartdiseaseandcanbetheinitialpresentationofdisease.Sustainedarrhythmiasareanimportantcauseofsuddendeath.Arrhythmiasassociatedwithgeneticabnormalitiesofcardiacionchannelscancausesuddendeathdespitetheabsenceofidentifiablestructuralheartdisease.Ventriculararrhythmiasthatoccurintheabsenceofstructuralheartdiseaseoradefinedionchannelabnormalityarereferredtoasidiopathic/,idi?p?θik/特发性andareusuallybenign.Evaluationandmanagementareguidedbytheriskofarrhythmicdeath,whichisdeterminedbythepresentingsymptoms,typeofarrhythmia,andassociatedunderlyingheartdisease.
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