Table 2.

Ventricular ectopy—definitions

Ectopy type	Definition
Polymorphic PVCs	Three or more distinct PVC morphologies (not slight variations of the same morphology) suggestive of multiple origins rather than multiple exits of a single site.
Short coupled PVC	A PVC with coupling interval less than 350 ms.92
NSVT	Three or more consecutive ventricular beats at a rate of ≥100 beats per minute lasting 30 s or less.
Monomorphic NSVT	NSVT with a single QRS morphology.
Polymorphic NSVT	NSVT with a constant beat to beat change in QRS morphology.
Sustained ventricular tachycardia	VT lasting more the 30 s or requiring immediate termination by external means.
Frequent ventricular ectopy	Premature ventricular beat constituting at least 5% of the total complexes.
Complex ventricular arrhythmia	NSVT, VT, and VF.

NSVT, non-sustained ventricular tachycardia; PVC, premature ventricular contractions.