FIELD: medicine.
SUBSTANCE: cardiac rhythm is recorded, processed by fast Fourier transformation followed by wave picking within the frequency ranges: VLF within the range of 0.004-0.08 Hz, normal wave amplitude 30-150 ms2/Hz, LF within the range of 0.09-0.16 Hz, normal wave amplitude 15-25 ms2/Hz, HF within the range of 0.17-0.5 Hz, normal wave amplitude 15-35 ms2/Hz. A heart rate variability (HRV) is examined while the patient performs an active orthostatic test. The patient initially lies in a horizontal position, and then goes into a vertical position and into a horizontal position again. If the LF and HF amplitude decreases after the patient goes into the vertical position, by more than 50% of the initial horizontal values, vegetative insufficiency is diagnosed. If the LF and HF amplitude decreases after the patient goes into the vertical position, by more than 50% of the initial horizontal values, and the VLF amplitude decreases after the patient goes into the vertical position, by more than 50% of the initial horizontal values, vegetative insufficiency with depressed compensation abilities of hemodynamic regulation is diagnosed.
EFFECT: technique enables detecting the specific pathophysiological mechanisms of disturbed vegetative and neurohumoral regulation of cardiac activity by evaluating the spectral indices when performing the orthostatic test.
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