Table 4.

Classification of ECG in the MIT-BIH database using AAMI standard.

Types	Contains heartbeat type
Normal (N)	Normal (NOR), left bundle branch block (LBBB), right bundle branch block (RBBB), atrial escape (AE), node (junction) escape heartbeat (NE)
Ventricular ectopic heartbeat (V)	Premature ventricular contraction (PVC), ventricular escape heartbeat (VE)
Fusion heartbeat (F)	Fusion of ventricular and normal (FVN)
Supraventricular ectopic heartbeat or premature heartbeat (S)	Atrial premature (AP), aberrant atrial premature (AaP), nodal (junctional) premature (NP), supraventricular premature (SP)
Unknown heartbeat (Q)	Paced (/), fusion of paced and normal (FPN), unclassified (U), undetermined (?)