Table 1.

AAMI recommendation of heartbeats.

Normal (N)	Supraventricular Ectopic Beat (SVEB)	Ventricular Ectopic Beat (VEB)	Fusion Beat (F)	Unknown Beat (Q)
Normal beat (N)	Atrial premature beat (A)	Premature ventricular contraction (V)	Fusion of ventricular and normal beat (F)	Paced beat (/)
Left bundle branch block (L)	Aberrated atrial premature beat (a)	Ventricular escape beat (E)		Fusion of paced and normal beat (f)
Right bundle branch block (R)	Nodal (junctional) premature beat (J)			Unclassified beat (Q)
Atrial escape beat (e)	Supraventricular premature beat (S)
Nodal junctional escape beat (j)