. 2021 Mar 17;12:582223. doi: 10.3389/fphys.2021.582223

TABLE 2.

Electrocardiographic parameters of the control, untreated MI, and pre-treated MI groups.

	Control	Untreated MI	Lipoic acid	Zinc	Clopidogrel
	(25)	(16)	(24)	(24)	(25)
ST-segment (mm)	0.63 ± 0.11	1.75 ± 0.14^a	0.90 ± 0.13^b	0.90 ± 0.18^b	1.07 ± 0.07^ab
HR (bpm)	406.75 ± 18.79	419.61 ± 16.10	426.00 ± 12.53	439.93 ± 17.63	461.60 ± 15.35^a
QTo (msec)	81.25 ± 2.21	116.19 ± 4.05^a	125.33 ± 3.63^a	102.67 ± 3.84^ab	86.67 ± 2.52^b
QTc (msec)	210.81 ± 8.50	275.33 ± 17.02^a	335.33 ± 9.79^ab	277.93 ± 13.25^a	238.33 ± 6.63^ab
QRS duration (msec)	23.75 ± 2.02	28.10 ± 2.03	37.33 ± 1.82^ab	48.00 ± 1.60^ab	33.33 ± 2.52^a
QRS voltage (μvolt)	478.13 ± 31.61	473.81 ± 26.42	471.33 ± 53.21	255 ± 38.16^ab	501.67 ± 32.04

Values are represented as mean ± SEM. The number of observations is given in parentheses. MI, myocardial infarction; HR, heart rate; QTo, QT interval observed; QTc, QT interval corrected. ^aSignificance of differences from control group calculated by Student’s t-test for unpaired data at p < 0.05. ^bSignificance of differences from MI group calculated by Student’s t-test for unpaired data at p < 0.05.