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Rheoencephalography: Past Popularity, Obvilion at Present and Optimistic Furure

Published on Jan 1, 2015in Advances in Life Science and Technology
· DOI :10.18488/journal.72/2015.2.1/72.1.1.15
Yu.E. Moskalenko1
Estimated H-index: 1
,
Ju.V. Andreeva1
Estimated H-index: 1
Cite
Abstract
The reoencephalographic method (REG) has been known for a number of decades. The history of this method includes loss of its popularity, years of oblivion and a second wave of recognition. Such a tumultuous history is common for methods based on physical principles, such as capacitance and resistance, when applied to physiology and medicine prior to serious preliminary investigations to establish indices for living tissues common to natural subjects. In this case because blood characterize by comparatively low electrical resistance it was concluded that the volume of blood and its circulatory processes could be monitored by this method. In reality this proved to be an over simplification. In particular, applying such methods to issues of cerebral circulation did not provide any significant understanding for medicine. Years passed before it was understood that CSF circulation played a significant role within the cranial cavity and that the REG signal reflected not only blood volume but also the volume of distribution between blood and CSF. Additionally it was found that the electrical conductivity of blood depends on its velocity of movement. These factors together with progress in electronics and application of computer techniques which allow for coupling of REG with other methods have given a “second birth” to the REG method which can become important to physiology and medicine. The new “face” of REG is introduced in the present paper.
  • References (7)
  • Citations (4)
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References7
Newest
Published on Jan 7, 2007in Journal of Physics D 2.83
Sverre Grimnes20
Estimated H-index: 20
(University of Oslo),
Ørjan G. Martinsen19
Estimated H-index: 19
(University of Oslo)
Tetrapolar electrode systems are commonly used for impedance measurements on biomaterials and other ionic conductors. They are generally believed to be immune to the influence from electrode polarization impedance and little can be found in the literature about possible pitfalls or sources of error when using tetrapolar electrode systems. In this paper we show that electrode polarization impedance can indeed influence the measurements and that also other phenomena such as negative sensitivity re...
Published on Oct 1, 2005in Physiological Measurement 2.25
N. Terzopoulos3
Estimated H-index: 3
(Oxford Brookes University),
K. Hayatleh9
Estimated H-index: 9
(Oxford Brookes University)
+ 2 AuthorsC.N. McLeod7
Estimated H-index: 7
(Oxford Brookes University)
A novel drive circuit, useful for medical electronics, is capable of supplying a sample of human tissue, across which there should be zero direct voltage (dc), with a well-defined test current from a source having an output impedance exceeding 16 M? at 100 kHz.
Published on Jan 1, 2004
Samuel Paul1
Estimated H-index: 1
,
Suresh Balakrishnan1
Estimated H-index: 1
+ 2 AuthorsM Vivekananda1
Estimated H-index: 1
Published on Apr 15, 2003
Herman P. Schwan37
Estimated H-index: 37
(UPenn: University of Pennsylvania),
Shiro Takashima14
Estimated H-index: 14
(UPenn: University of Pennsylvania)
Published on Apr 1, 1999in Annals of the New York Academy of Sciences 4.29
Herman P. Schwan37
Estimated H-index: 37
(UPenn: University of Pennsylvania)
: Future problems are based on achievements of the past. They may be unresolved problems of a more basic nature or future practical applications made possible by recent technical innovations. The introductory part of this paper deals with recent history and its many significant advances. This is followed by a survey of the bioimpedance field. Past advances include contributions of the bioimpedance field to electrophysiology, biophysics, and biochemistry. More practical contributions include the ...
Published on Jan 1, 1992in Journal of The American College of Nutrition 2.08
Robert F. Kushner46
Estimated H-index: 46
Abstract Whole-body bioelectrical impedance analysis (BIA) is widely used by researchers and clinicians as a noninvasive and safe method to estimate body composition and body water volume in children and adults. Development of new approaches, such as segmental and multifrequency analyzers, should greatly expand the utility of this electrical technique. This article reviews the principles, underlying assumptions, clinical applications and future directions of the BIA method.
Published on Dec 1, 1950in Circulation 23.05
Jan Nyboer1
Estimated H-index: 1
(Dartmouth College),
Marian M. Kreider1
Estimated H-index: 1
(Dartmouth College),
Leonard Hannapel1
Estimated H-index: 1
(Dartmouth College)
The quantity of blood measured by electrical impedance plethysmography is defined by its resistive effect in parallel to the resistance of other tissue of the segment. By substitution of this parallel resistive value, together with data relative to the resistivity of blood and the length of the segment in the formula for the volume of an electrical conductor, we are able to derive the volume of the pulse in cubic centimeters. It follows that the volume displaced from the venous reservoir and the...
Cited By4
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Published on Jun 18, 2019in Entropy 2.42
Carmen González6
Estimated H-index: 6
,
Erik Weber Jensen16
Estimated H-index: 16
+ 1 AuthorsMontserrat Vallverdú16
Estimated H-index: 16
Rheoencephalography (REG) is a simple and inexpensive technique that intends to monitor cerebral blood flow (CBF), but its ability to reflect CBF changes has not been extensively proved. Based on the hypothesis that alterations in CBF during apnea should be reflected in REG signals under the form of increased complexity, several entropy metrics were assessed for REG analysis during apnea and resting periods in 16 healthy subjects: approximate entropy (ApEn), sample entropy (SampEn), fuzzy entrop...
Amir H. Meghdadi8
Estimated H-index: 8
,
Djordje Popovic11
Estimated H-index: 11
+ 3 AuthorsAjay Verma9
Estimated H-index: 9
Objective: To demonstrate the utility of rheoencephalography (REG) for measuring cerebral blood flow and fluid dynamics during different stages of sleep. Methods: Anteroposterior cranial electrical impedance was measured with concurrent polysomnography in a group of healthy subjects during sleep. Transcranial electrical impedance was characterized by measuring the peak-to-trough and envelope of the filtered pulsative REG signal as well as its frequency. The sensitivity of the REG amplitude to ch...
Published on Dec 7, 2018in PLOS ONE 2.78
Carmen González6
Estimated H-index: 6
(UPC: Polytechnic University of Catalonia),
Erik Weber Jensen16
Estimated H-index: 16
+ 1 AuthorsMontserrat Vallverdú16
Estimated H-index: 16
(UPC: Polytechnic University of Catalonia)
Objective Rheoencephalography is a simple and inexpensive technique for cerebral blood flow assessment, however, it is not used in clinical practice since its correlation to clinical conditions has not yet been extensively proved. The present study investigates the ability of Poincare Plot descriptors from rheoencephalography signals to detect apneas in volunteers. Methods A group of 16 subjects participated in the study. Rheoencephalography data from baseline and apnea periods were recorded and...
Published on Sep 1, 2017in Water Air and Soil Pollution 1.77
Sharmila Bhandari1
Estimated H-index: 1
(TSU: Texas Southern University),
B. B. Maruthi Sridhar12
Estimated H-index: 12
(TSU: Texas Southern University),
Bobby L. Wilson13
Estimated H-index: 13
(TSU: Texas Southern University)
Rapid increase in impervious surfaces due to urbanization often intensifies the frequency of flooding which in turn increases runoff of environmental pollutants. The Brays Bayou watershed (BBW) is a heavily urbanized and densely populated watershed located mostly in Harris County, TX. The objectives of our study are (1) to analyze and interpret the spatial and temporal land use and land cover changes in BBW and (2) to determine nutrient, heavy metal, and bacterial contamination in the Brays Bayo...
Published on Jun 1, 2014in Environmental Monitoring and Assessment 1.96
Atul Kumar Singh8
Estimated H-index: 8
,
Sharad C. Srivastava4
Estimated H-index: 4
+ 2 AuthorsAmbrish Verma2
Estimated H-index: 2
Monitoring of heavy metals was conducted in the Yamuna River considering bioaccumulation factor, exposure concentration, and human health implications which showed contamination levels of copper (Cu), lead (Pb), nickel (Ni), and chromium (Cr) and their dispersion patterns along the river. Largest concentration of Pb in river water was 392 μg L−1; Cu was 392 μg L−1 at the extreme downstream, Allahabad and Ni was 146 μg L−1 at midstream, Agra. Largest concentration of Cu was 617 μg kg−1, Ni 1,621 ...
Published on Dec 1, 2013in Indian Journal of Pediatrics 1.14
Devalina Mookerjee1
Estimated H-index: 1
Interpersonal communication between pediatricians and mothers is both complex and interdependent. The mother is dependent on the pediatrician for her child’s wellbeing and care along expertise-related dimensions for which she cannot provide. The pediatrician is dependent on the mother’s ability to provide accurate information about the child’s health and habits, so that the doctor, who has limited time with the child, is able to make continuing accurate diagnoses. This paper seeks to provide a b...