Abstract
Slow rhythmic oscillations in the human cranial cavity were studied using two noninvasive methods: the bioimpedance method (volume ratios between liquid media in the cranial cavity) and transcranial ultrasound Doppler echography (variation in the blood flow in the middle cerebral artery). The combination of these methods made it possible to estimate the intracranial hemodynamics. Simultaneous recording of these parameters and their spectral analysis were carried out in healthy subjects and patients with intracranial hypertension syndrome and disturbed cerebrospinal fluid (CSF) flow. The parameters were recorded at rest and immediately after manual (osteopathic) correction. The recording and analysis were performed using a Macintosh-IIsi PC and the Chart-3.52, Cricket Graph-3.32, and Canvas-3.5 software. It was found that slow oscillations of the bioimpedance (BIM) in the frequency range 0.08–0.2 Hz were of intracranial origin and were related to the mechanisms of regulation of the blood supply to and oxygen consumption by cerebral tissue, as well as with the dynamics of the CSF circulation.
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Moskalenko, Y.E., Frymann, V., Weinstein, G.B. et al. Slow Rhythmic Oscillations within the Human Cranium: Phenomenology, Origin, and Informational Significance. Human Physiology 27, 171–178 (2001). https://doi.org/10.1023/A:1011071115227
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DOI: https://doi.org/10.1023/A:1011071115227