scholarly journals Wavelet analysis methods in the comprehensive study approach of skin microhemodynamics as a cardiovascular unit

2018 ◽  
Vol 17 (3) ◽  
pp. 33-41
Author(s):  
A. V. Tankanag
Keyword(s):  
Blood Flow ◽  
Wavelet Transform ◽  
Coherence Function ◽  
Low Frequency ◽  
Peripheral Blood Flow ◽  
Blood Flow Oscillations ◽  
Adaptive Wavelet ◽  
Study Approach ◽  
Flow Oscillations ◽  
Adaptive Wavelet Transform

Adaptive wavelet transform techniques for studying of microcirculatory blood flow oscillations are described. It is shown that the suggested methods will be especially claimed in the analysis of low-frequency components of short-lived transient processes under various functional test conditions. In addition, the use of adaptive wavelet transform reduces the essential duration of signal registration, which can be useful in the study of the microhemodynamics in patients with heavy pathologies. Also the method for investigating the phase relationships between microvasculatory oscillations is given which based on estimating the values of wavelet phase coherence function. The proposed method makes it possible to identify frequency intervals with high and low phase correlations of peripheral blood flow oscillations.

scholarly journals Spatial heterogeneity of cutaneous blood flow respiratory-related oscillations quantified via laser speckle contrast imaging

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0252296
Author(s):  
Irina Mizeva ◽  
Elena Potapova ◽  
Viktor Dremin ◽  
Igor Kozlov ◽  
Andrey Dunaev
Keyword(s):  
Blood Flow ◽  
Spatial Heterogeneity ◽  
Vascular Tone ◽  
Laser Speckle ◽  
Spontaneous Respiration ◽  
Peripheral Blood Flow ◽  
Contrast Imaging ◽  
Blood Flow Oscillations ◽  
Flow Oscillations ◽  
Physiological Tests

LSCI technique provides experimental data which can be considered in the context of spatial blood flow coherency. Analysis of vascular tone oscillations gives additional information to ensure a better understanding of the mechanisms affecting microvascular physiology. The oscillations with different frequencies are due to different physiological mechanisms. The reasons for the generation of peripheral blood flow oscillations in the 0.14–0.6 Hz frequency band are as follows: cardio-respiratory interactions, pressure variations in the venous part of the circulatory system, and the effect of the sympathetic nervous system on the vascular tone. Earlier, we described the spatial heterogeneity of around 0.3 Hz oscillations and this motivated us to continue the research to find the conditions for the occurrence of spatial phase synchronization. For this purpose, a number of physiological tests (controlled respiration, breath holder, and venous occlusion tests) which influence the blood flow oscillations of 0.14–0.6 Hz were considered, an appropriate measurement system and the required data processing algorithms were developed. At spontaneous respiration, the oscillations with frequencies around 0.3 Hz were stochastic, whereas all the performed tests induced an increase in spatial coherence. The protocols and methods proposed here can help to clarify whether the heterogeneity of respiratory-related blood flow oscillations exists on the skin surface.

scholarly journals Low-frequency blood flow oscillations in congestive heart failure and after β1-blockade treatment

2008 ◽  
Vol 76 (3) ◽  
pp. 224-232 ◽  
Author(s):  
A. Bernjak ◽  
P.B.M. Clarkson ◽  
P.V.E. McClintock ◽  
A. Stefanovska
Keyword(s):  
Heart Failure ◽  
Congestive Heart Failure ◽  
Blood Flow ◽  
Low Frequency ◽  
Blood Flow Oscillations ◽  
Flow Oscillations

Anesthesia effects on the low frequency blood flow oscillations in mouse skin

2018 ◽  
Vol 25 (1) ◽  
pp. 40-46 ◽  
Author(s):  
M. E. Astashev ◽  
D. A. Serov ◽  
A. V. Tankanag
Keyword(s):  
Blood Flow ◽  
Low Frequency ◽  
Mouse Skin ◽  
Blood Flow Oscillations ◽  
Flow Oscillations
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