fiber→myocardiumРautomaticityРProperty of spontaneously discharging cells(spotaneous AP, diastolic depolarization)?Automaticity increases from high to low as follows:?Physiological status:SN、AVN、HIS、Purkinje?pathological:diseased myocardial and conductive tissue, etc.РProperty of normal rhythmРImpulse from SN?Heart rate is within 60~100/min?Regular rhythm,P interval<0.12s?PR interval is between 0.12~0.20s,plex duration<0.10s?Frontal axis within -30~90°?It is considered as arrhythmia if any item above is not matchedРClassification of cardiac arrhythmiasРClassified on property of electrical activity?Abnormality of impulse and conduction?Classified on heart rate, rapid or slow?Rapid or slow arrhythmias?Classified on clinical manifestation, mild or sever?Fatal or nonfatal?High risk or low risk
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