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Relevant bibliographies by topics / Rheoencephalography

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Academic literature on the topic 'Rheoencephalography'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 August 2024

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Journal articles on the topic "Rheoencephalography"

1

Bodo, Michael, Ryan Sheppard, Aaron Hall, Martin Baruch, Melissa Laird, Shravalya Tirumala, and Richard Mahon. "Correlation of rheoencephalography and laser Doppler flow: a rat study." Journal of Electrical Bioimpedance 7, no. 1 (August 8, 2019): 55–58. http://dx.doi.org/10.5617/jeb.2985.

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Abstract Measuring brain electrical impedance (rheoencephalography) is a potential technique for noninvasive, continuous neuro-monitoring of cerebral blood flow autoregulation in humans. In the present rat study, we compared changes in cerebral blood flow autoregulation during CO2 inhalation measured by rheoencephalography to changes measured by laser Doppler flowmetry, an invasive continuous monitoring modality. Our hypothesis was that both modalities would reflect cerebral blood flow autoregulation. Male Sprague-Dawley rats (n=28; 28 control and 82 CO2 challenges) were measured under anesthesia. The surgical preparation involved implantation of intracerebral REG electrodes and an LDF probe into the brain. Analog waveforms were stored in a computer. CO2 inhalation caused transient, simultaneous increases in the signals of both laser Doppler flow (171.99 ± 46.68 %) and rheoencephalography (329.88 ± 175.50%). These results showed a correlation between the two measured modalities; the area under the receiver operating characteristic curve was 0.8394. The similar results obtained by measurements made with laser Doppler flowmetry and rheoencephalography indicate that rheo-encephalography, like laser Doppler flowmetry, reflects cerebral blood flow autoregulation. Rheoencephalography therefore shows potential for use as a continuous neuro-monitoring technique.

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Bodo, Michael. "Studies in Rheoencephalography (REG)." Journal of Electrical Bioimpedance 1, no. 1 (July 23, 2019): 18–40. http://dx.doi.org/10.5617/jeb.109.

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Abstract This article presents an overview of rheoencephalography (REG) – electrical impedance measurements of the brain – and summarizes past and ongoing research to develop medical applications of REG for neuro-critical care and for primary prevention of stroke and cardiovascular disease. The availability of advanced electronics and computation has opened up the potential for use of REG technology as a noninvasive, continuous and inexpensive brain monitor for military and civilian applications. The clinical background information presented here introduces physiological and clinical environments where REG has potential for use in research and clinical settings. REG studies over the past three decades have involved in vitro and in vivo groups (animal and human), including more than 1500 measurements and related electronic and computational results and practical applications. In vitro studies helped researchers understand the flow/volume relationship between Doppler ultrasound and electrical impedance signals and supported development of REG data processing methods. In animal studies, REG was used to monitor the lower limit of cerebral blood flow (CBF) autoregulation (AR) using a newly developed algorithm. These animal studies also confirmed correlations between REG and measurements of carotid flow (CF) and intracranial pressure (ICP). Human studies confirmed the applicability of REG for detecting cerebrovascular alteration, demonstrating the usefulness of REG in the field of stroke/cardio-vascular disease prevention. In these studies, REG was compared to known stroke risk factors and to results obtained using carotid ultrasound measurements. An intelligent REG system (Cerberus) has been developed for primary stroke prevention. In these studies, the biologically relevant variables of the REG signal were pulse amplitude (minimum – maximum distance) and duration of the anacrotic (rising) portion of the REG pulse wave. The principal limitation of REG for clinical application is the lack of pathological and physiological correlations. The studies presented here have initiated such inquiries, but many clinical questions about the pathophysiological background of REG remain unanswered. These results demonstrate that REG development is a multidisciplinary subject with relevance for medicine (vascular neurology and neurosurgery intensive care); electronic engineering; mathematics, and computer science (data processing). It is hoped that information presented in this article will provide assistance to those involved in REG research, particularly in development and clinical applications.

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Bodo, M., F. J. Pearce, and R. A. Armonda. "Cerebrovascular reactivity: rat studies in rheoencephalography." Physiological Measurement 25, no. 6 (September 8, 2004): 1371–84. http://dx.doi.org/10.1088/0967-3334/25/6/003.

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Brady, K. M., J. O. Mytar, K. K. Kibler, R. B. Easley, R. C. Koehler, M. Czosnyka, P. Smielewski, et al. "Monitoring cerebrovascular pressure reactivity with rheoencephalography." Journal of Physics: Conference Series 224 (April 1, 2010): 012089. http://dx.doi.org/10.1088/1742-6596/224/1/012089.

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Bodo, Michael, Gyorgy Thuroczy, Mike Bodo, Tamas Nebella, Gyula Panczel, Kornel Sipos, Peter Bonoczk, Zoltan Nagy, and Andras Javor. "Use of rheoencephalography for primary stroke prevention." Journal of Cerebral Blood Flow & Metabolism 25, no. 1_suppl (August 2005): S551. http://dx.doi.org/10.1038/sj.jcbfm.9591524.0551.

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Hoang Tin, Nguyen, Tran Thai Thanh Tam, and Phung Minh Thu. "The noninvasive neuromonitoring in medicine: Rheoencephalography (REG)." American Journal of Medical Sciences and Medicine 11, no. 3 (August 17, 2023): 67–73. http://dx.doi.org/10.12691/ajmsm-11-3-1.

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Szabo, Sandor, Zsolt Totka, Jozsef Nagy-Bozsoky, Istvan Pinter, Mihaly Bagany, and Michael Bodo. "Rheoencephalography: A non-invasive method for neuromonitoring." Journal of Electrical Bioimpedance 15, no. 1 (January 1, 2024): 10–25. http://dx.doi.org/10.2478/joeb-2024-0003.

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Abstract In neurocritical care, the gold standard method is intracranial pressure (ICP) monitoring for the patient's lifesaving. Since it is an invasive method, it is desirable to use an alternative, noninvasive technique. The computerized real-time invasive cerebral blood flow (CBF) autoregulation (AR) monitoring calculates the status of CBF AR, called the pressure reactivity index (PRx). Studies documented that the electrical impedance of the head (Rheoencephalography – REG) can detect the status of CBF AR (REGx) and ICP noninvasively. We aimed to test REG to reflect ICP and CBF AR. For nineteen healthy subjects we recorded bipolar bifrontal and bitemporal REG derivations and arm bioimpedance pulses with a 200 Hz sampling rate. The challenges were a 30-second breath-holding and head-down-tilt (HDT – Trendelenburg) position. Data were stored and processed offline. REG pulse wave morphology and REGx were calculated. The most relevant finding was the significant morphological change of the REG pulse waveform (2nd peak increase) during the HDT position. Breath-holding caused REG amplitude increase, but it was not significant. REGx in male and female group averages have similar trends during HDT by indicating the active status of CBF AR. The morphological change of REG pulse wave during HDT position was identical to ICP waveform change during increased ICP, reflecting decreased intracranial compliance. A correlation study between ICP and REG was initiated in neurocritical care patients. The noninvasive REG monitoring would also be useful in space research as well as in military medicine during the transport of wounded service members as well as for fighter pilots to indicate the loss of CBF and consciousness.

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Sarafyniuk, L. A., and D. O. Merkulova. "Peculiarities of relationships between rheoencephalographic and anthropo-metric indicators of mesomorphic volleyball players somatotype." Reports of Vinnytsia National Medical University 26, no. 4 (December 24, 2022): 557–61. http://dx.doi.org/10.31393/reports-vnmedical-2022-26(4)-06.

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Annotation. For early detection of signs of fatigue and overtraining at high altitude of professional sportsmen, quality is of great practical importance monitoring of the state of the cardiovascular system, in particular indicators of cerebral hemodynamics in combination with individual constitutional features of the body. The purpose of the study was determination of features of relationships between rheoencephalographic indicators and parameters of the external body structure of volleyball players youth of a high level of skill, which belonged to the mesomorphic constitutional type. They conducted a comprehensive study of 70 young men (aged from 17 to 21 years old), who played volleyball for at least 3 years and achieved a high level skill level (small sports categories from the first adult to masters of sports). After somatotyping according to the Heath-Carter (1990) found mesomorphic somatotype in 36 volleyball players. Rheoencephalography was performed on a computer diagnostic complex according to by the method of Ronkin and Ivanov (1997), anthropometry - by the method of V. V. Bunak (1941), correlation analysis - according to Spearman's method. It was established that in cerebral indicators of mesomorphic somatotype volleyball players hemodynamics had individual anthropo-somatotypological parameters reliable relationships, most of which were directly proportional to mean strength. Temporal correlations had the greatest strength and number of statistically significant correlations rheoencephalographic indicators, in particular the time of the ascending part rheoencephalograms. Most often with indicators of cerebral hemodynamics total body dimensions (length and surface area) were reliably correlated bodies, height of anthropometric points, anterior-posterior and transverse diameters body, girth measurements of chest and limb segments, separate craniometric dimensions). The study of correlations is the basis determining the harmony of physical development of athletes and further mathematical modeling to determine individual dues rheoencephalographic indicators.

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Izvarina, Olga A., Tatiana O. Nikolaeva, Viktor V. Anikin, Natalia S. Beganskaya, and Nikolai I. Gromnatskiy. "Experience of studying cerebral disorders in women in menopause." Человек и его здоровье 24, no. 4 (2021): 9–16. http://dx.doi.org/10.21626/vestnik/2021-4/02.

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The incidence of arterial hypertension (AH) in women increases significantly with the onset of menopause. Age-related hypoestrogenism leads both to an increase in blood pressure (BP) and to a violation of its daily profile. It can lead to impaired cerebral blood flow. Objective: to study the features of cerebral disorders in women in the perimenopausal period with and without hyper-tension using rheoencephalography, as well as their relationship with some indicators of the daily blood pressure profile. Materials and methods. A clinical and instrumental examination of 190 women in the climacteric period (141 people with hypertension and 49 without hypertension) was carried out, who were divided into groups depending on the presence of hypertension and the period of perimenopause. Instrumental research included 24-hour blood pressure monitoring and rheoencephalography. Results. The onset of menopause was accompanied by an increase in the degree of arterial hypertension, with an in-crease mainly in systolic blood pressure. Changes in its daily profile was also noted, especially insufficient or excessive de-crease at night, as well as an increased speed and magnitude of the morning rise both in women with hypertension and without it. The revealed disorders were more pronounced in postmenopausal women and were accompanied by changes in cerebral circulation, which can lead to ischemic and hemorrhagic cerebral complications. Conclusion. Comparison of indicators of rheoencephalography and daily monitoring of blood pressure in menopausal women revealed changes in cerebral circulation, most pronounced in the presence of arterial hypertension and after meno-pause.

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Bodó, Mihály. "A noninvasive, continuous brain monitoring method: rheoencephalography (REG)." DRC Sustainable Future: Journal of Environment, Agriculture, and Energy 1, no. 2 (October 2, 2020): 103–19. http://dx.doi.org/10.37281/1.2.3.

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This paper deals with the sustainability under anoxic conditions of human beings, both when healthy, and diseased. As our attention is focused these days on the environment, sustainability, and green energy, a similar effort is being made in neuromonitoring to switch from invasive to noninvasive monitoring methods. Keys to these changes are computerization and shrinking size of electronic hardware. Computerization is going on in all areas of biomedical engineering, both in research and in clinical fields of medicine. In neurology, brain imaging is the most characteristic change in recent decades. These modalities of imaging (MRI, CT, PET scan, etc.) are predominantly utilized for localizing brain pathology. Brain imaging offers great spatial resolution, but poor time resolution. Therefore, for continuous monitoring, neurocritical care departments require an additional tool with good time resolution. There are invasive and noninvasive neuromonitoring methods. The standard method to monitor intracranial pressure (ICP) is an invasive method. Computerization allows for calculating the cerebral blood flow autoregulation (CBF AR) index (pressure reactivity index - PRx) from ICP and systemic arterial pressure (SAP) in real time, continuously, but invasively. The new development, discussed in this paper, is to calculate this index noninvasively by using rheoencephalography (REG), called REGx. We present the road to this invention and summarize multifold REG related results, such as using REG for primary stroke prevention screening, comparison incidence of arteriosclerotic risk factors, various studies by using CBF manipulations, and correlations with other neuromonitoring methods, and validation with in vitro and in vivo methods. REG by using different algorithms allow for real time calculation of autoregulated blood flow. This paper presents results of validation of CBF algorithms as an effective, noninvasive method. The author’s intent is to supply sufficient physiological background information. This review covers the author’s research efforts over several decades; it pertains multiple studies and has an updated addition to human sustainability by considering that Covid-19 is increasing stroke and cardiovascular disease (CVD) morbidity and mortality.

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Dissertations / Theses on the topic "Rheoencephalography"

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Биттерлих, Л. Р. "Информативность метода реоэнцефалографии для диагностики типа головных болей у детей." Thesis, Издательство СумГУ, 1997. http://essuir.sumdu.edu.ua/handle/123456789/24995.

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Book chapters on the topic "Rheoencephalography"

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Wysocka-Bakowska, Maria M. "Rheoencephalography with Nitroglycerin Test in Migraine." In Updating in Headache, 159–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-88581-5_27.

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Luzhnov, P. V., A. I. Dyachenko, and Yu S. Semenov. "Research of Impedance Characteristics with a Negative Pressure Breathing Using Rheocardiographic and Rheoencephalographic Signals." In IFMBE Proceedings, 937–40. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-9038-7_173.

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Perez, Juan J., Enrique Guijarro, Pedro Ortiz, and José M. Pons. "New Perspectives in Rheoencephalography." In Encyclopedia of Healthcare Information Systems, 990–97. IGI Global, 2008. http://dx.doi.org/10.4018/978-1-59904-889-5.ch123.

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One of the most important advances in biomedical engineering has been the ability to inspect inside the body without opening it. In this sense, rheoencephalography (REG) is an electromedical technique used to assess the cerebral blood flow (CBF) by noninvasive electrical impedance methods, using electrodes attached to the scalp surface. This technique was first proposed by Polzer and Schuhfried (1950), and emerged as an extrapolation of impedance plethysmography applied to the head. An electric current flowing through a biological tissue causes a potential difference between any pair of electrodes that can be measured. This potential difference depends on the amplitude of the injected current, the shape of the conductor, the arrangement of the electrodes, and the electrical characteristics of the tissue. For instance, the electrical conductivity of the lung tissue is much lower than that of the cerebrospinal fluid (CSF), since alveolar sacs are nonconductive. Furthermore, the electrical conductivity depends on the frequency of the electric current, the orientation of the tissue fibers relative to the current flow, and the amount of extracellular fluid that surrounds the cells. For example, electrical conductivity is higher in the blood than in most tissues, since plasma acts as a truehighway for ions (Malmivuo & Plonsey, 1995).

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Perez, Juan J., Enrique Guijarro, Pedro Ortiz, and José M. Pons. "Enhanced Rheoencephalograhy." In Encyclopedia of Healthcare Information Systems, 519–26. IGI Global, 2008. http://dx.doi.org/10.4018/978-1-59904-889-5.ch066.

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A close monitoring of the cerebrovascular parameters is essential in some neurological diseases to prevent secondary brain insults. Persistent rises in intracranial pressure caused by oedema, tumours, or haematomas may decrease the cerebral blood flow (CBF) to values below the minimum required for neuronal survival (Lang & Chesnut, 1994). As a method to evaluate CBF, Polzer and Schuhfried proposed in 1950 to apply the well-known impedance plethysmography techniques to the head, which was specifically referred to as Rheoencephalography (REG) (Polzer & Schuhfried, 1950). For this purpose, bipolar and tetrapolar electrode arrangements, named as REG I and REG II respectively, were used to measure the impedance changes of the head synchronized to the heartbeat. In REG I, a low-amplitude current is injected through two electrodes attached to the scalp, and the related electric potential difference is measured between these electrodes, whereas in REG II, a second pair of electrodes is used to measure the electric potential difference (Geddes & Baker, 1989). The latter technique reduces eventual artifacts caused by mechanical alterations in the electrode-skin interface of the current injection electrodes.

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Conference papers on the topic "Rheoencephalography"

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Sagirov, Arlan, Nadezhda Guseva, Timofey Sergeev, and Alexander Shabrov. "SYNCHRONOUS CHANGES IN CARDIORHYTHMOGRAPHY, RHEOENCEPHALOGRAPHY AND ELECTROENCEPHALOGRAPHY DURING ANTIORTHOSTATIC TILT." In XVII INTERNATIONAL INTERDISCIPLINARY CONGRESS NEUROSCIENCE FOR MEDICINE AND PSYCHOLOGY. LCC MAKS Press, 2021. http://dx.doi.org/10.29003/m2306.sudak.ns2021-17/329-330.

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Guijarro, Enrique, Juan J. Perez, Enrique Berjano, and Pedro Ortiz. "Sensitivity of rheoencephalographic measurements to spatial brain electrical conductivity." In Conference Proceedings. Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2006. http://dx.doi.org/10.1109/iembs.2006.260788.

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Guijarro, Enrique, Juan J. Perez, Enrique Berjano, and Pedro Ortiz. "Sensitivity of rheoencephalographic measurements to spatial brain electrical conductivity." In Conference Proceedings. Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2006. http://dx.doi.org/10.1109/iembs.2006.4398847.

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Perez, Juan J., Enrique Guijarro, Jeronimo Sancho, and Arantxa Navarre. "Extraction of the Intracranial Component from the Rheoencephalographic Signal: A New Approach." In Conference Proceedings. Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2006. http://dx.doi.org/10.1109/iembs.2006.260544.

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Perez, Juan J., Enrique Guijarro, Jeronimo Sancho, and Arantxa Navarre. "Extraction of the Intracranial Component from the Rheoencephalographic Signal: A New Approach." In Conference Proceedings. Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE, 2006. http://dx.doi.org/10.1109/iembs.2006.4398841.

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