A question in arrhythmia

Hi, i'm 3rd year and I have a question about arrhythmia, we studied that arrhythmia could be as a result of disturbance in Automaticity / Excitability / Conductibility. As I know, Disturbance in auto. could be Sinus bradycardia and sinus tachycardia. Disturbance in conduct. = AV bock( types) but about excitability, I understood that there is Extra systole and Reentry i got that examples of extra systole is Atrial extra systole or vent. or atriovent. and example of reentry is Atrial flutter... A question in arrhythmia
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