Textile Concentric Ring Electrodes: Influence of Position and Electrode Size on Cardiac Activity Monitoring

Table 3

Mean and standard deviation of the absolute signal amplitude statistics (median and interquartile range) and normalized amplitude statistics (median and maximum value) obtained using TCREs and lead II ( refers to the wave characteristics detected in the optimal wave recording area).

		Absolute amplitude		Normalized amplitude
Electrode	Wave	Median (μV)	Interquartile range (μV)	Median	Maximum
TCRE50		11.2 ± 2.9	14.7 ± 8.8	0.09 ± 0.03	0.29 ± 0.13
		11.5 ± 4.9	10.2 ± 6.2	0.14 ± 0.05	0.26 ± 0.11
	QRS	158.2 ± 38.8	296.3 ± 193.5	—	—
		38.7 ± 11.0	75.4 ± 47.4	0.28 ± 0.06	0.76 ± 0.14
TCRE42		8.1 ± 2.1	9.9 ± 5.8	0.09 ± 0.03	0.32 ± 0.19
		8.8 ± 3.3	7.9 ± 3.1	0.16 ± 0.07	0.32 ± 0.19
	QRS	118.2 ± 32.6	190.3 ± 87.9	—	—
		30.6 ± 8.3	59.9 ± 37.1	0.30 ± 0.07	0.89 ± 0.22
Lead II		116.0 ± 29.2	—	0.12 ± 0.09	—
	QRS	1182.9 ± 467.1	—	—	—
		316.3 ± 139.2	—	0.28 ± 0.14	—

The constant location of lead II electrodes means some statistics have no practical meaning; these are indicated with dashes to avoid misinterpretation. Similarly, a double dash is used for the normalized QRS amplitude statistic, which is always 1.