TABLE 2. Description of Abbreviation of ECG Labels, Which are Also Used as Segment Labels.

Abbreviation of ECG recording labels	Description
N	normal sinus rhythm
A	atrial fibrillation
O	other cardiac rhythms
~	noise segment
AF	atrial fibrillation
IAVB	1st degree AV block
LBBB	left bundle brunch block
NSR	sinus rhythm
RBBB	right bundle brunch block
VE	ventricular ectopic beats
STD	sinus tachycardia depression
STE	sinus tachycardia elevation