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ASSESSMENT OF INDICATORS OF SPECTRAL ANALYSIS

All indicators are subject to assessment, but the most important are: TP (ms2), HF (%), LF (%), VLF (%), LF / HF and IC.

The values ​​of all indicators of spectral analysis can vary greatly with poor-quality preparation of the patient for the study, as well as in the presence of rhythm and conduction disturbances or artifacts in the analyzed section.

The indicator of the total spectrum power - TP (ms2) is the most important HRV indicator characterizing the functional state of the heart as a whole. However, it is very sensitive to impaired regulation of CP.

For example, when comparing the results of two studies that differ only in the value of 2 CI (as it happens with extrasystole with a compensatory pause), a significant change in the parameters of the spectral analysis is determined:

The rhythmogram of patient K., 20 years old

The rhythmogram of the same patient with a change in the values ​​of 2 CI to the values ​​of extrasystolic

Spectrogram of the same patient Spectrogram of the same patient with a change in the values ​​of 2 CI

Diagram of the powers of the components of the spectral analysis of the same patient

Diagram of the same patient with a change in 2 CI values

The power and relative contribution of high-frequency waves - HF (ms2) and HF (%) reflect PSNS activity.
High values ​​of these indicators are observed in healthy people. The power and relative contribution of low-frequency waves - LF (ms2) and LF (%) reflect the activity of the SNA. The power and relative contribution of very low frequency waves - VLF (ms2) and VLF (%) reflect the contribution of the humoral-metabolic mechanisms of CP regulation. The predominance of VLF (%) is observed in patients with pathological changes in the regulation of SR.

Omnidirectional changes in the spectral analysis indicators are sometimes noted, which greatly complicates the interpretation of the results. Therefore, all of these indicators should be evaluated jointly. For example, with a high HF value (%), a low TP value (ms2) and vice versa can be observed.

A MI patient with a predominance of HF waves (%) and a sharply reduced value of the total power of the TR spectrum

A patient with stage I hypertension, with a predominance of VLF waves (%) and a normal value of the total spectrum power indicator
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ASSESSMENT OF INDICATORS OF SPECTRAL ANALYSIS

  1. ASSESSMENT OF INDICATORS OF AUTOCORRELATION ANALYSIS
    When conducting spectral analysis, autocorrelation indicators are usually not evaluated. The 1k exponent is usually less accurate than M0. The M0 index corresponds to the number of autocorrelation shifts through which the first negative value of the correlation coefficient appears. It has low values ​​with a good functional state of the CCC and increases when waves of low and very high prevail in the rhythmogram
  2. ASSESSMENT OF INDICATORS OF TEMPORAL ANALYSIS OF PSNS
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