Open Access e-Journal Cardiometry No.16 May 2020
We should mention that Cardiometry is a fine diagnostics tool to assess heart life expectancy. Our experts, using Cardiocode in “red zones” in intensive care units, have confirmed effectiveness of noninvasive measuring of the hemodynamics data on the cardiovascular system performance in critical patients with different severity degrees. The medical staff involved had a possibility not only to monitor the state in each critical patient, but also to predict and control the progression of a disease. We are going to publish some results of this pilot study in our next issues.
We should mention that Cardiometry is a fine diagnostics tool to assess heart life expectancy. Our experts, using Cardiocode in “red zones” in intensive care units, have confirmed effectiveness of noninvasive measuring of the hemodynamics data on the cardiovascular system performance in critical patients with different severity degrees. The medical staff involved had a possibility not only to monitor the state in each critical patient, but also to predict and control the progression of a disease. We are going to publish some results of this pilot study in our next issues.
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a)
Figure 3. Low-frequency noise polynomial filtering results
b)
Тable 1. Evaluation of low-frequency noise filtering quality
Lead / Filter
V1 V2 V3 V4 V5 V6 I III aVR aVF II aVL
Newton high-frequency filter
RMSD,
* 77,4 343,9 251,4 212,6 150,6 119,4 58,1 185,9 94,9 180 178,6 104,9
mcV ** 79,8 391,2 244,2 197,3 140,5 110,4 60,8 184,4 91,9 176,6 173,8 106,3
S i
( q ) *** 92,4 376,3 251,8 226,9 146 102 61,4 190 99,4 184,8 184,6 106,9
**** 84,5 371,1 243,2 230,6 158,1 107,3 59,7 188,7 101,1 185,1 186,3 104,4
* 719,8 296,9 1086 808,4 790,3 626,7 368,8 1717,4 1223,6 1899,3 2081,6 677,9
RMSD,
** 808 952,8 1752,6 1499,6 1867,7 1565,7 139,3 1510,6 625,2 1444,9 1379,6 821,4
mcV
*** 215 257,8 395,3 328,1 449,3 617,7 149,4 69,1 174 130,9 201,6 58,2
n i
( q )
**** 207 201 565,9 422,8 424,8 388,8 103,2 963,5 494,9 966 971,2 483,4
* -39,5 -23,4 -29,9 -26,9 -33,8 -36,4 -42,4 -35 -29,4 -31,6 -25,6 -38,8
NAC, ** -35 -25,9 -33 -34,2 -39,9 -40,2 -40,6 -32,7 -29,3 -28,6 -20,7 -36,6
dB *** -25 -25,6 -26,8 -31,9 -30,1 -24,6 -39,8 -31,6 -27,6 -27,2 -16,7 -35,8
**** -27,6 -22,8 -29,5 -26,3 -30,6 -36 -32,1 -33,6 -26,4 -32,5 -31 -34,7
Butterworth high-frequency filter
RMSD,
* 81,4 396,6 303,4 237,1 167 132,7 68,8 197 110,2 194,2 197,4 109,7
mcV ** 84,4 450,8 292,2 216,7 152 123 71,7 191,8 105,1 186,7 188,1 110,2
S i
( q ) *** 97,9 433,7 310,4 253,5 160,9 112,8 73,1 197,9 113,4 195,6 200 110,7
**** 89,9 426,5 298,5 258,6 175,8 119,5 71,4 198,6 116,4 198,3 204,3 180,8
* 719,5 275,2 1080,7 805,9 789,2 625,9 368,3 1717,2 1223,2 1899 2081,2 677,8
RMSD,
** 807,9 944,8 1749,8 1498,7 1867,3 1565,3 137,8 1510,4 624,6 1444,6 1379,1 821,4
mcV
*** 214,4 229,8 380,7 321,4 447,9 617,2 147,8 64,9 171,4 127,1 197,6 57,1
n i
( q )
**** 206,3 164,1 555 416,2 422,1 387,4 100,9 963 494 965,1 970 483,2
NAC,
dB
* -39 -22,2 -28,3 -25,9 -32,9 -35,5 -41 -34,5 -28,1 -30,9 -24,8 -38,3
** -34,5 -24,7 -31,5 -33,3 -39,2 -39,3 -39,2 -32,3 -28,2 -28,1 -20 -36,3
*** -24,5 -24,3 -24,9 -30,9 -29,3 -23,7 -38,3 -31,2 -26,5 -26,7 -16 -35,5
**** -27 -21,6 -27,7 -25,3 -29,7 -35 -30,6 -33,1 -25,1 -31,9 -30,1 -34,4
Note: Designations of quantitative ECG signal processing results for electrodes:
* - H92SG, ** - H99SG, *** - MSGLT-05MGRT, **** - М2202А
of all attenuates the low- and high- frequency noises.
Figure 6 offers a Tukey diagram showing an accuracy
of the low-frequency noise attenuation coefficient calculation.
Our analysis of the quantitative results of multilead
ECG signal recording processing, with various
electrodes, allows us to note that a minor variability
is available between the RMSD values in the filtered
signals of the same ECG signal lead, however, due to
nonstationarity of the signal parameters, some insignificant
differences exist. Despite the above features,
the results of the low-frequency noise separation and
their calculated RMSD value, generated by using the
filters, show that the H92SG and H99SG electrodes
generate the highest RMSD noise value as compared
to electrodes MSGLT- 05MGRT and M2202A. Electrode
MSGLT-05MGRT generates the lowest RMSD
value in 7 of 12 analyzed ECG signal leads, while
92 | Cardiometry | Issue 16. May 2020