Electrophysiological Technique for Exploring Cerebral Hemodynamics and Brain Bioelectrical Activity During Postural Changes

2021 ◽  
Author(s):  
Arlan F. Sagirov ◽  
Nadezhda L. Guseva ◽  
Elizaveta A. Agapova ◽  
Aleksei A. Anisimov ◽  
Alexander V. Shabrov
Keyword(s):  
Cerebral Hemodynamics ◽  
Bioelectrical Activity ◽  
Postural Changes ◽  
Electrophysiological Technique

scholarly journals Two-Tiered Response of Cardiorespiratory-Cerebrovascular Network to Orthostatic Challenge

2021 ◽  
Vol 12 ◽  
Author(s):  
Peter Mukli ◽  
Zoltan Nagy ◽  
Frigyes Samuel Racz ◽  
Istvan Portoro ◽  
Andras Hartmann ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Arterial Blood Pressure ◽  
Pearson Correlation ◽  
Transcranial Doppler Sonography ◽  
Cerebral Hemodynamics ◽  
Orthostatic Stress ◽  
Arterial Blood ◽  
Postural Changes ◽  
The Impact ◽  
Homeostatic Mechanisms

Dynamic interdependencies within and between physiological systems and subsystems are key for homeostatic mechanisms to establish an optimal state of the organism. These interactions mediate regulatory responses elicited by various perturbations, such as the high-pressure baroreflex and cerebral autoregulation, alleviating the impact of orthostatic stress on cerebral hemodynamics and oxygenation. The aim of this study was to evaluate the responsiveness of the cardiorespiratory-cerebrovascular networks by capturing linear and nonlinear interdependencies to postural changes. Ten young healthy adults participated in our study. Non-invasive measurements of arterial blood pressure (from that cardiac cycle durations were derived), breath-to-breath interval, cerebral blood flow velocity (BFV, recorded by transcranial Doppler sonography), and cerebral hemodynamics (HbT, total hemoglobin content monitored by near-infrared spectroscopy) were performed for 30-min in resting state, followed by a 1-min stand-up and a 1-min sit-down period. During preprocessing, noise was filtered and the contribution of arterial blood pressure was regressed from BFV and HbT signals. Cardiorespiratory-cerebrovascular networks were reconstructed by computing pair-wise Pearson-correlation or mutual information between the resampled signals to capture their linear and/or nonlinear interdependencies, respectively. The interdependencies between cardiac, respiratory, and cerebrovascular dynamics showed a marked weakening after standing up persisting throughout the sit-down period, which could mainly be attributed to strikingly attenuated nonlinear coupling. To summarize, we found that postural changes induced topological changes in the cardiorespiratory-cerebrovascular network. The dissolution of nonlinear networks suggests that the complexity of key homeostatic mechanisms maintaining cerebral hemodynamics and oxygenation is indeed sensitive to physiological perturbations such as orthostatic stress.

FEATURES OF CEREBRAL CIRCULATORY DYNAMICS AND CEREBRAL BIOELECTRIC ACTIVITY IN CHILDREN WITH CRANIOCEREBRAL INJURY

2020 ◽  
pp. 55-59
Author(s):  
Viktoriia Mykolaivna Petrenko
Keyword(s):  
Traumatic Brain Injury ◽  
Brain Injury ◽  
Transcranial Doppler Sonography ◽  
Cerebral Hemodynamics ◽  
Bioelectrical Activity ◽  
Craniocerebral Injury ◽  
Paroxysmal Activity ◽  
Brain Contusion ◽  
Epidural Hemorrhage ◽  
Circulatory Dynamics

In order to study the state of cerebral hemodynamics and to investigate the electroencephalographic characteristics in children with closed traumatic brain injury, 114 patients were examined. The children were examined in 6.1±0.8 months after a traumatic brain injury. To determine cerebral hemodynamics, transcranial dopplerography was performed, the functional state of brain was evaluated according to electroencephalography. In the course of the study, it was noted that a disordered cerebral hemodynamics in children with moderate and severe brain contusion and its foci presence was accompanied by a rise in a linear velocity of blood flow, while its decrease was found at the same contusion, but that was severe and with the presence of subdural, subarachnoid and epidural hemorrhage. Signs of diffuse changes in bioelectrical activity of the brain were represented by a significant increase in an amplitude of the alpha rhythm in children with closed traumatic brain injury of moderate and serious severities compared to mild one. Key words: children, craniocerebral injury, electroencephalography, transcranial Doppler sonography, paroxysmal activity.

Brain Bioelectrical Activity and Cerebral Hemodynamics in Athletes under Combined Cognitive and Physical Loading

2019 ◽  
Vol 45 (2) ◽  
pp. 164-173 ◽  
Author(s):  
L. V. Kapilevich ◽  
G. S. Yezhova ◽  
A. N. Zakharova ◽  
A. V. Kabachkova ◽  
S. G. Krivoshchekov
Keyword(s):  
Cerebral Hemodynamics ◽  
Bioelectrical Activity ◽  
Physical Loading

No effect of artificial gravity on lung function with exercise training during head-down bed rest

2015 ◽  
pp. 1-7
Author(s):  
Longxiang Su ◽  
Yinghua Guo ◽  
Yajuan Wang ◽  
Delong Wang ◽  
Changting Liu
Keyword(s):  
Lung Function ◽  
Pulse Rate ◽  
Vital Capacity ◽  
Pulmonary Ventilation ◽  
Bed Rest ◽  
Forced Expiratory Volume ◽  
Observation Time ◽  
Artificial Gravity ◽  
Postural Changes ◽  
Expiratory Flow

AbstractTo explore the effectiveness of microgravity simulated by head-down bed rest (HDBR) and artificial gravity (AG) with exercise on lung function. Twenty-four volunteers were randomly divided into control and exercise countermeasure (CM) groups for 96 h of 6° HDBR. Comparisons of pulse rate, pulse oxygen saturation (SpO2) and lung function were made between these two groups at 0, 24, 48, 72, 96 h. Compared with the sitting position, inspiratory capacity and respiratory reserve volume were significantly higher than before HDBR (0° position) (P< 0.05). Vital capacity, expiratory reserve volume, forced vital capacity, forced expiratory volume in 1 s, forced inspiratory vital capacity, forced inspiratory volume in 1 s, forced expiratory flow at 25, 50 and 75%, maximal mid-expiratory flow and peak expiratory flow were all significantly lower than those before HDBR (P< 0.05). Neither control nor CM groups showed significant differences in the pulse rate, SpO2, pulmonary volume and pulmonary ventilation function over the HDBR observation time. Postural changes can lead to variation in lung volume and ventilation function, but a HDBR model induced no changes in pulmonary function and therefore should not be used to study AG CMs.

Postural Changes in Essential Hypertension under Treatment and their Effect on the Renogram

1971 ◽  
Vol 10 (01) ◽  
pp. 39-46
Author(s):  
C. Alexandrou ◽  
E. Papadakis ◽  
E. Gyftaki ◽  
J. Darsinos
Keyword(s):  
Renal Function ◽  
Essential Hypertension ◽  
Early Diagnosis ◽  
Postural Hypotension ◽  
Antihypertensive Treatment ◽  
Normal Subjects ◽  
Upright Position ◽  
Postural Changes ◽  
Significant Impairment

SummaryRadioisotope renograms were obtained in the upright and prone position in 9 normal subjects, in 5 patients with untreated essential hypertension and in 21 hypertensives under treatment, showing moderate postural hypotension.No significant renographic change were seen in the two positions in normal subjects and untreated hypertensives. Treated hypertensives with postural hypotension showed significant impairment of renal function in the upright position in 15 cases and no change in 6. Renal creatinine clearance was lower in the group that showed renographic changes. Renography in the upright position is suggested as a convenient test for early diagnosis and follow-up of the adverse effects of antihypertensive treatment.

Cerebral hemodynamics during arousals in preterm infants

2006 ◽  
Vol 210 (S 5) ◽  
Author(s):  
H Zotter ◽  
B Urlesberger ◽  
R Kerbl ◽  
G Pichler ◽  
W Müller
Keyword(s):  
Preterm Infants ◽  
Cerebral Hemodynamics

Comparative analysis of changes of bioelectrical activity of the brain during the neutral touch and during the performance of the myofascial release technique

2018 ◽  
pp. 46-55
Author(s):  
A. F. Belyaev ◽  
G. E. Piskunova
Keyword(s):  
Soft Tissue ◽  
Brain Activity ◽  
Direct Action ◽  
Brain Regions ◽  
Therapeutic Touch ◽  
Bioelectrical Activity ◽  
Therapeutic Action ◽  
Osteopathic Treatment ◽  
The Difference ◽  
Multiparameter Analysis

Introduction. One of the main tools of an osteopath are soft tissue techniques, which have a number of particular qualities such as minimization of force and duration of indirect techniques with an emphasis on muscle and ligamentous structures; combination of gestures, tendency to maximal relaxation and exclusion of direct action on pathological symptoms such as tension, overtone and pain. Minimization of the force applied during the performance of soft tissue techniques often invites a question whether there are differences between the usual touch and the therapeutic touch of an osteopath.Goal of research - to reveal the changes in the bioelectrical activity of the cerebral cortex arising in the process of osteopathic treatment in order to prove its specifi city in comparison with nonspecifi c tactile stimulation (neutral touch).Materials and methods. 75 people were examined with the use of multiparameter analysis of multichannel EEG in different times. 25 patients were clinically healthy adults, whereas 50 patients had signs of somatic dysfunctions.Results. Computer encephalography permits to perceive the difference between the neutral touch and the therapeutic action. An identifi cation reaction is a response to the neutral touch (changes in brain bioelectrical activity with an increase in statistically signifi cant connections in the temporal lobes), whereas the therapeutic action provokes the state of purposeful brain activity during still point (intensifi cation of frontooccipital interactions).Conclusions. Osteopathic action causes additional tension in the processing of incoming information, which requires participation of different brain regions, including interhemispheric mechanisms associated with analysis, maintenance of attention and regulation of targeted activities.

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