Table 1.

All arrhythmic events and criteria required for classification

Arrhythmia type	Criteria
Atrial fibrillation	Episode >30 s in duration.
Non-sustained VT	Three or more ventricular beats at a rate >120 bpm for a duration of <30 s.
Sustained VT	Ventricular tachycardia for a duration of >30 s.
VT with haemodynamic compromise	Sustained VT with haemodynamic instability, for example, hypotension or syncope.

VT, ventricular tachycardia; bpm, beats per minute.