Cardiac ArrhythmiaINTRODUCTION Arrhythmia: abnormalities of cardiac rhythm and conduction Arrhythmias can be lethal (sudden cardiac death ) , symptomatic ( syncope , near syncope dizziness , or palpitations ) , or asymptomatic . They are dangerous to the extent that they reduce cardiac output , so that perfusion of the brain or myocardium is impaired , or tend to deteriorate into more serious arrhythmias with the same consequences Anatomy of cardiac conduction systemCategory of Arrhythmia Abnorm
