Research Article

Heartbeat Classification Using Normalized RR Intervals and Morphological Features

Figure 4

Illustrations of the presence of (a) atrial premature beats in class S and (b) premature ventricular contraction beats in class V. N denotes the normal beat, A denotes the atrial premature beat, and V denotes the premature ventricular contraction beat.
712474.fig.004a
(a)
712474.fig.004b
(b)