Table 3.

ST_a with the standard and modification of the limb electrode positions. Mean values are listed for the difference (M-S) in which positive values indicate an increase in amplitude and negative values indicate a decrease caused by modification. Percentage gains in mean amplitudes are also provided. Amplitudes are in microvolts

Measurement	Leads	Standard position (SLL)		Modified position (MLL)		Modified–Standard position (% change)
		Mean	SD	Mean	SD	Mean	%
ST(J) amplitude	I	22	12	8	5	-14	-64
	II	13	8	11	7	-2	-15
	III	9	5	5	2	-4	-44
	aVR	-16	11	-11	9	-5	-31
	aVL	11	5	7	4	-4	-36
	aVF	18	10	11	7	-8	-44
ST (J+20) amplitude	I	42	27	21	10	-21	-50
	II	28	14	25	12	-3	-11
	III	11	6	6	3	-5	-45
	aVR	-27	10	-23	12	-4	-15
	aVL	27	13	7	5	-20	-74
	aVF	8	3	15	9	7	87
ST (J+40) amplitude	I	69	44	24	14	-45	-65
	II	44	30	35	10	-9	-20
	III	15	8	9	5	-6	-40
	aVR	-45	22	-23	7	-22	-49
	aVL	41	27	7	3	-34	-83
	aVF	18	9	23	11	5	28
ST (J+60) amplitude	I	81	49	31	17	-50	-62
	II	55	35	36	11	-19	-34
	III	20	11	5	2	-15	-75
	aVR	-58	33	-34	9	-24	-41
	aVL	47	32	17	10	-30	-64
	aVF	16	9	25	11	9	56
ST (J+80) amplitude	I	67	34	36	22	-31	-46
	II	43	21	17	9	-16	-37
	III	37	19	7	4	-30	-81
	aVR	-40	23	-12	5	-28	-70
	aVL	25	13	16	11	-9	-36
	aVF	74	37	36	20	-38	-51

MLL - modified limb lead; SD - standard deviation; SLL - standard limb lead; values are in microvolts