classified by rate (tachycardia, bradycardia), mechanism (automaticity, re-entry, triggered) or duration (isolated premature beats; couplets; runs, that is 3 or more beats; non-sustained = less than 30 seconds or sustained = over 30 seconds).

Arrhythmias are also classified by site of origin:

Atrial arrhythmia

* Sinus bradycardia
* Sinus arrhythmia

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