. Author manuscript; available in PMC: 2016 Jul 1.

Published in final edited form as: IEEE Trans Nanobioscience. 2015 Apr 24;14(5):505–512. doi: 10.1109/TNB.2015.2426213

TABLE II.

Complete List of the 42 Features Extracted From Each of the 12-Lead ECG Signals for Classifying Heartbeats. (The Total Number of Features is 42×12=504)

Group	Feature	Definition	Number of features
Temporal (based on length of intervals)	Pre-RR interval	The interval between the current heartbeat and the previous heartbeat	6
	Post-RR interval	The interval between the current heartbeat and the following heartbeat
	Average RR-interval	The mean of the RR intervals of a recording and the it is used as the same for all the heartbeats in a recording
	P-wave duration	The interval between the P-wave onset and offset
	QRS interval	The interval between the QRS onset and offset
	T-wave duration	The interval between QRS-offset and T-wave offset
Morphological (based on amplitude values)	QRS morphology	10 uniformly sampled amplitude values between the QRS onset and the QRS offset.	36
	QRS morphology	Maximum and minimum of original sampled amplitude values in the QRS complex.
	P and T wave morphology	10 uniformly sampled amplitude values between the wave onset and the wave offset.
	P and T wave morphology	The maximum and the minimum of the original sampled amplitude values in the P and T wave.