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Bioimpedance spectroscopy

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https://www.readbyqxmd.com/read/28415069/comparison-of-bioimpedance-and-underwater-weighing-body-fat-percentage-before-and-acutely-after-exercise-at-varying-intensities
#1
Brett S Nickerson, Michael R Esco, Brian M Kliszczewicz, Todd J Freeborn
Nickerson, BS, Esco, MR, Kliszczewicz, BM, and Freeborn, TJ. Comparison of bioimpedance and underwater weighing body fat percentage before and acutely after exercise at varying intensities. J Strength Cond Res 31(5): 1395-1402, 2017-The purpose of this study was to compare single-frequency bioelectrical impedance analysis (BIA) and bioimpedance spectroscopy (BIS) with underwater weighing (UWW) body fat percentage (BF%) before (PRE), immediately post (IP), and 60 minutes post (60P) an acute bout of moderate and vigorous aerobic exercise...
May 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28399019/pathophysiology-and-implications-of-intradialytic-hypertension
#2
Peter Noel Van Buren
PURPOSE OF REVIEW: Intradialytic hypertension occurs regularly in 10--15% of hemodialysis patients. A large observational study recently showed that intradialytic hypertension of any magnitude increased mortality risk comparable to the most severe degrees of intradialytic hypotension. The present review review discusses the most recent evidence underlying the pathophysiology of intradialytic hypertension and implications for its management. RECENT FINDINGS: Patients with intradialytic hypertension typically have small interdialytic weight gains, but bioimpedance spectroscopy shows these patients have significant chronic extracellular volume excess...
April 8, 2017: Current Opinion in Nephrology and Hypertension
https://www.readbyqxmd.com/read/28396734/low-lean-tissue-mass-is-an-independent-risk-factor-for-mortality-in-patients-with-stages-4-and-5-non-dialysis-chronic-kidney-disease
#3
Almudena Vega, Soraya Abad, Nicolás Macías, Inés Aragoncillo, Alba Santos, Isabel Galán, Santiago Cedeño, Juan Manuel López-Gómez
Background: Mortality in patients with stages 4 and 5 chronic kidney disease (CKD) is higher than in the general population. Body composition predicts mortality. Our objective was to evaluate the effect of body composition on mortality in patients with stages 4 and 5 non-dialysis CKD. Methods: We performed a prospective study of 356 patients with stages 4 and 5 non-dialysis CKD. At baseline, we recorded general characteristics, history of cardiovascular events, body composition, serum inflammatory markers, nutrition and cardiac biomarkers...
April 2017: Clinical Kidney Journal
https://www.readbyqxmd.com/read/28395286/heart-failure-with-preserved-and-reduced-ejection-fraction-in-hemodialysis-patients-prevalence-disease-prediction-and-prognosis
#4
Marlies Antlanger, Stefan Aschauer, Chantal Kopecky, Manfred Hecking, Johannes J Kovarik, Johannes Werzowa, Julia Mascherbauer, Bernd Genser, Marcus D Säemann, Diana Bonderman
BACKGROUND/AIMS: Heart failure (HF) is a main cause of mortality of hemodialysis (HD) patients. While HF with reduced ejection fraction (HFrEF) is known to only affect a minority of patients, little is known about the prevalence, associations with clinical characteristics and prognosis of HF with preserved ejection fraction (HFpEF). METHODS: We included 105 maintenance HD patients from the Medical University of Vienna into this prospective single-center cohort study and determined the prevalence of HFpEF (per the 2013 criteria of the European Society of Cardiology) and HFrEF (EF <45%), using standardized post-HD transthoracic echocardiography...
April 11, 2017: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/28387710/in-vivo-bioimpedance-spectroscopy-characterization-of-healthy-hemorrhagic-and-ischemic-rabbit-brain-within-10-hz-1-mhz
#5
Lin Yang, Wenbo Liu, Rongqing Chen, Ge Zhang, Weichen Li, Feng Fu, Xiuzhen Dong
Acute stroke is a serious cerebrovascular disease and has been the second leading cause of death worldwide. Conventional diagnostic modalities for stroke, such as CT and MRI, may not be available in emergency settings. Hence, it is imperative to develop a portable tool to diagnose stroke in a timely manner. Since there are differences in impedance spectra between normal, hemorrhagic and ischemic brain tissues, multi-frequency electrical impedance tomography (MFEIT) shows great promise in detecting stroke. Measuring the impedance spectra of healthy, hemorrhagic and ischemic brain in vivo is crucial to the success of MFEIT...
April 7, 2017: Sensors
https://www.readbyqxmd.com/read/28372500/clinical-significance-of-bioimpedance-spectroscopy-in-critically-ill-patients
#6
Shang-Feng Yang, Ching-Min Tseng, I-Fan Liu, Shin-Hung Tsai, Wein-Shung Kuo, Tien-Ping Tsao
BACKGROUND: Early fluid resuscitation is a key aspect in the successful management of critically ill patients, but the optimal goal for volume control after the acute stage of critical illness remains unclear. This study aimed to evaluate the prognostic value of bioimpedance spectrometry for fluid management in critically ill patients. METHODS: In this prospective observational study, patients who consented to participate were screened within the first 24 hours of admission to a medical intensive care unit (ICU) from February 4, 2015, to January 31, 2016...
January 1, 2017: Journal of Intensive Care Medicine
https://www.readbyqxmd.com/read/28328660/addressing-the-barriers-to-bioimpedance-spectroscopy-use-in-major-burns-alternate-electrode-placement
#7
Pippa Kenworthy, Tiffany L Grisbrook, Michael Phillips, William Gibson, Fiona M Wood, Dale W Edgar
Bioimpedance spectroscopy (BIS) is a method used to assess body composition and fluid distribution. As a technology for measurement of fluid shifts during acute burn resuscitation, there are potential barriers to its use due to the location of wounds. This study aimed to determine whether alternate electrode positions were a suitable alternative compared to standardized (manufacturer) positions in moderate to large size burns for the measurement of BIS resistance and fluid changes. BIS measurements were collected in standard and alternate electrode placements and in an open wound and Acticoat™ dressing condition...
March 15, 2017: Journal of Burn Care & Research: Official Publication of the American Burn Association
https://www.readbyqxmd.com/read/28318630/sarcopenia-and-its-individual-criteria-are-associated-in-part-with-mortality-among-patients%C3%A2-on-hemodialysis
#8
Piyawan Kittiskulnam, Glenn M Chertow, Juan J Carrero, Cynthia Delgado, George A Kaysen, Kirsten L Johansen
The relative importance of sarcopenia and its individual components as independent predictors of mortality in the dialysis population has not been determined. We estimated whole-body muscle mass using pre-dialysis bioimpedance spectroscopy measurements in 645 ACTIVE/ADIPOSE-enrolled prevalent hemodialysis patients from San Francisco and Atlanta. Low muscle mass was defined as two standard deviations below sex-specific means for young adults from NHANES and indexed to height(2), body weight, body surface area, or body mass index...
March 16, 2017: Kidney International
https://www.readbyqxmd.com/read/28282925/associations-between-maternal-body-composition-and-appetite-hormones-and-macronutrients-in-human-milk
#9
Sambavi Kugananthan, Zoya Gridneva, Ching T Lai, Anna R Hepworth, Peter J Mark, Foteini Kakulas, Donna T Geddes
Human milk (HM) appetite hormones and macronutrients may mediate satiety in breastfed infants. This study investigated associations between maternal adiposity and concentrations of HM leptin, adiponectin, protein and lactose, and whether these concentrations and the relationship between body mass index and percentage fat mass (%FM) in a breastfeeding population change over the first year of lactation. Lactating women (n = 59) provided milk samples (n = 283) at the 2nd, 5th, 9th and/or 12th month of lactation...
March 9, 2017: Nutrients
https://www.readbyqxmd.com/read/28269447/using-bioimpedance-spectroscopy-parameters-as-real-time-feedback-during-tdcs
#10
Isar Nejadgholi, Herschel Caytak, Miodrag Bolic
An exploratory analysis is carried out to investigate the feasibility of using BioImpedance Spectroscopy (BIS) parameters, measured on scalp, as real-time feedback during Transcranial Direct Current Stimulation (tDCS). TDCS is shown to be a potential treatment for neurological disorders. However, this technique is not considered as a reliable clinical treatment, due to the lack of a measurable indicator of treatment efficacy. Although the voltage that is applied on the head is very simple to measure during a tDCS session, changes of voltage are difficult to interpret in terms of variables that affect clinical outcome...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269260/localised-impedance-monitoring-device-for-the-remote-clinical-assessment-of-home-based-dialysis-patients
#11
A Montalibet, W Arkouche, P Bogonez Franco, S Bonnet, A Clarion, G Delhomme, C Gehin, S Gharbi, R Guillemaud, P Jallon, B Massot, P Pham, E Ribbe-Cornet, E McAdams
BioImpedance Spectroscopy (BIS) has been clinically used to determine the hydrational status of patients undergoing haemodialysis (HD). In the present project we are developing a calf-localised, integrated impedimetric device to periodically and conveniently measure and transmit information on the hydrational status of home-based patients to a remote clinic. Surprisingly, we have found that simple postural changes before or during measurement lead to significant fluid shifts in the lower leg that are as important and as long lasting as the effects of haemodialysis...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268788/measurement-of-electrical-impedance-in-different-ex-vivo-tissues
#12
Davide Meroni, Dario Bovio, Pietro A Frisoli, Andrea Aliverti
Bioimpedance allows living tissues characterization and detection of pathological states. Although in previous years several methods have been proposed to assess bioimpedance, many instruments used in studies of living tissues characterization are commercial devices designed for the measurement of components or electronic circuits and therefore the measurement of biological tissues can be affected by electrical polarization. In order to test if electrical impedance spectroscopy may be helpful in providing further information about the structure and the properties of tissues, an impedance meter for living-tissues, able to avoid polarization, was developed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268701/dual-mode-cmos-analog-front-end-afe-for-electrical-impedance-spectroscopy-eis-systems
#13
Virgilio Valente, Dai Jiang, Andreas Demosthenous
This paper presents the operation of a dual-mode wideband CMOS analog front-end (AFE) for electrical impedance spectroscopy. The chip combines two current-readout (CR) channels and four voltage-readout (VR) channels suitable for both bipolar and tetrapolar EIS analysis. The chip addresses the need for flexible readout units for real-time simultaneous single-cell and large scale tissue/organ analysis. Postlayout simulations show that the VR channel is capable of wideband operation up to 12 MHz with noise floor as low as 16...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28260396/disorders-of-serum-omega-3-fatty-acid-composition-in-dialyzed-patients-and-their-associations-with-fat-mass
#14
COMPARATIVE STUDY
Małgorzata Sikorska-Wiśniewska, Adriana Mika, Tomasz Śledziński, Sylwia Małgorzewicz, Piotr Stepnowski, Bolesław Rutkowski, Michał Chmielewski
Patients with chronic kidney disease (CKD) are at increased risk of cardiovascular mortality. Lipid disorders, a constant feature of CKD, might contribute to this state. The aim of this study was to evaluate n-3 polyunsaturated fatty acids (PUFA) composition in CKD patients treated with dialysis, in comparison to the general population and to assess possible associations between the n-3 PUFA profile and anthropometric variables. Thirty-three prevalent dialysis patients were studied and compared with an age- and sex-adjusted control group of 22 patients...
November 2017: Renal Failure
https://www.readbyqxmd.com/read/28227693/using-bioimpedance-spectroscopy-parameters-as-real-time-feedback-during-tdcs
#15
Isar Nejadgholi, Herschel Caytak, Miodrag Bolic, Isar Nejadgholi, Herschel Caytak, Miodrag Bolic, Isar Nejadgholi, Miodrag Bolic, Herschel Caytak
An exploratory analysis is carried out to investigate the feasibility of using BioImpedance Spectroscopy (BIS) parameters, measured on scalp, as real-time feedback during Transcranial Direct Current Stimulation (tDCS). TDCS is shown to be a potential treatment for neurological disorders. However, this technique is not considered as a reliable clinical treatment, due to the lack of a measurable indicator of treatment efficacy. Although the voltage that is applied on the head is very simple to measure during a tDCS session, changes of voltage are difficult to interpret in terms of variables that affect clinical outcome...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227494/localised-impedance-monitoring-device-for-the-remote-clinical-assessment-of-home-based-dialysis-patients
#16
A Montalibet, W Arkouche, P Bogonez Franco, S Bonnet, A Clarion, G Delhomme, C Gehin, S Gharbi, R Guillemaud, P Jallon, B Massot, P Pham, E Ribbe-Cornet, E McAdams, A Montalibet, W Arkouche, P Bogonez Franco, S Bonnet, A Clarion, G Delhomme, C Gehin, S Gharbi, R Guillemaud, P Jallon, B Massot, P Pham, E Ribbe-Cornet, E McAdams, B Massot, P Pham, A Montalibet, P Jallon, E Ribbe-Cornet, P Bogonez Franco, G Delhomme, S Bonnet, R Guillemaud, W Arkouche, A Clarion, C Gehin, S Gharbi, E McAdams
BioImpedance Spectroscopy (BIS) has been clinically used to determine the hydrational status of patients undergoing haemodialysis (HD). In the present project we are developing a calf-localised, integrated impedimetric device to periodically and conveniently measure and transmit information on the hydrational status of home-based patients to a remote clinic. Surprisingly, we have found that simple postural changes before or during measurement lead to significant fluid shifts in the lower leg that are as important and as long lasting as the effects of haemodialysis...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226982/measurement-of-electrical-impedance-in-different-ex-vivo-tissues
#17
Davide Meroni, Dario Bovio, Pietro A Frisoli, Andrea Aliverti, Davide Meroni, Dario Bovio, Pietro A Frisoli, Andrea Aliverti, Dario Bovio, Andrea Aliverti, Davide Meroni, Pietro A Frisoli
Bioimpedance allows living tissues characterization and detection of pathological states. Although in previous years several methods have been proposed to assess bioimpedance, many instruments used in studies of living tissues characterization are commercial devices designed for the measurement of components or electronic circuits and therefore the measurement of biological tissues can be affected by electrical polarization. In order to test if electrical impedance spectroscopy may be helpful in providing further information about the structure and the properties of tissues, an impedance meter for living-tissues, able to avoid polarization, was developed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226889/dual-mode-cmos-analog-front-end-afe-for-electrical-impedance-spectroscopy-eis-systems
#18
Virgilio Valente, Dai Jiang, Andreas Demosthenous, Virgilio Valente, Dai Jiang, Andreas Demosthenous, Dai Jiang, Andreas Demosthenous, Virgilio Valente
This paper presents the operation of a dual-mode wideband CMOS analog front-end (AFE) for electrical impedance spectroscopy. The chip combines two current-readout (CR) channels and four voltage-readout (VR) channels suitable for both bipolar and tetrapolar EIS analysis. The chip addresses the need for flexible readout units for real-time simultaneous single-cell and large scale tissue/organ analysis. Postlayout simulations show that the VR channel is capable of wideband operation up to 12 MHz with noise floor as low as 16...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28191763/electrical-cell-substrate-impedance-spectroscopy-can-monitor-age-grouped-human-adipose-stem-cell-variability-during-osteogenic-differentiation
#19
Rachel C Nordberg, Jianlei Zhang, Emily H Griffith, Matthew W Frank, Binil Starly, Elizabeth G Loboa
Human adipose stem cells (hASCs) are an attractive cell source for bone tissue engineering applications. However, a critical issue to be addressed before widespread hASC clinical translation is the dramatic variability in proliferative capacity and osteogenic potential among hASCs isolated from different donors. The goal of this study was to test our hypothesis that electrical cell-substrate impedance spectroscopy (ECIS) could track complex bioimpedance patterns of hASCs throughout proliferation and osteogenic differentiation to better understand and predict variability among hASC populations...
February 2017: Stem Cells Translational Medicine
https://www.readbyqxmd.com/read/28165555/nutritional-status-and-intrarenal-arterial-stiffness-in-cardiorenal-syndrome-a-pilot-study
#20
A Gigante, F Di Mario, B Barbano, E Rosato, G Di Lazzaro Giraldi, R Pofi, M L Gasperini, D Amoroso, R Cianci, A Laviano
OBJECTIVE: Cardio-Renal Syndrome (CRS) is a condition, which is more frequently observed in clinical practice. The aim of this study is to explore nutritional status and intrarenal arterial stiffness in patients affected by CRS. PATIENTS AND METHODS: 14 consecutive CRS patients, screened for anthropometry, biochemistry, nutritional and metabolic status underwent renal Doppler ultrasound and whole-body bioimpedance spectroscopy (BIS). RESULTS: We found a positive correlation between phase angle (PA) and CKD-EPI and MDRD (p=0...
January 2017: European Review for Medical and Pharmacological Sciences
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