Automatic classification of long-term ambulatory ECG records according to type of ischemic heart disease

Table 2 Results of determining deflections of leads

	Reference level correction			No reference level correction
First moment	K _C = 2 × 10 ³ ( μ V)			K _C = 3.5 × 10 ³ ( μ V)
	*positive*	*negative*	*mixed, no episodes*	*positive*	*negative*	*mixed, no episodes*
Elevations	9 (90%)	0 (0%)	1 (10%)	8 (80%)	2 (20%)	0 (0%)
Depressions	3 (3%)	89 (96%)	1 (1%)	24 (26%)	67 (72%)	2 (2%)
Mixed	3 (60%)	2 (40%)	0 (0%)	2 (40%)	3 (60%)	0 (0%)
No episodes	11 (26%)	24 (56%)	8 (19%)	11 (26%)	27 (63%)	5 (12%)
Second moment	K _C = 75 × 10 ³ ( μ V) ²			K _C = 150 × 10 ³ ( μ V) ²
	*positive*	*negative*	*mixed, no episodes*	*positive*	*negative*	*mixed, no episodes*
Elevations	10 (100%)	0 (0%)	0 (0%)	9 (90%)	1 (10%)	0 (0%)
Depressions	0 (0%)	90 (97%)	3 (3%)	17 (18%)	76 (82%)	0 (0%)
Mixed	3 (60%)	2 (40%)	0 (0%)	2 (40%)	3 (60%)	0 (0%)
No episodes	10 (23%)	20 (47%)	13 (30%)	12 (28%)	24 (56%)	7 (16%)
Third moment	K _C = 3.75 × 10 ⁶ ( μ V) ³			K _C = 4.75 × 10 ⁶ ( μ V) ³
	*positive*	*negative*	*mixed, no episodes*	*Positive*	*negative*	*mixed, no episodes*
Elevations	10 (100%)	0 (0%)	0 (0%)	9 (90%)	1 (10%)	0 (0%)
Depressions	0 (0%)	92 (99%)	1 (1%)	12 (13%)	81 (87%)	0 (0%)
Mixed	3 (60%)	2 (40%)	0 (0%)	2 (40%)	3 (60%)	0 (0%)
No episodes	9 (21%)	17 (40%)	17 (40%)	13 (30%)	24 (56%)	6 (14%)

Results of determining deflections of leads of the 74 AECG records using the first, second, and third statistical moment, with the reference level correction (left) and without the reference level correction (right), with regard to the reference annotations of the protocol B of the LTST DB. Percentages of leads per total number of leads for given deflection (elevations, depressions, mixed, or no episodes) are bracketed.

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