Read by QxMD icon Read

Bioimpedance spectroscopy

K Tangvoraphonkchai, A Davenport
BACKGROUND/OBJECTIVES: Patients with chronic kidney disease treated by haemodialysis (HD) are at increased risk of sarcopenia. Bioelectrical impedance spectroscopy (BIS) can be used to determine body composition, and is one of the several potential screening tools for sarcopenia. The newer generation of portable hand-held devices can be readily used in dialysis centres. The results from BIS devices using a two-compartmental model of body composition can be affected by hydration status and so ideally measurements should be made when patients are not overhydrated...
September 28, 2016: European Journal of Clinical Nutrition
Janet Douglass, Patricia Graves, Susan Gordon
BACKGROUND: Measurements of tissue compressibility and extracellular fluid (ECF) are used to monitor progression of lymphedema, a chronic swelling of the subcutaneous tissue. Later stages of lymphedema are characterized by fibrotic induration in the subcutis and hyperkeratosis of the skin. Several devices are available to measure these changes, but previous reliability and validity studies have been conducted primarily on adult women with unilateral arm lymphedema using contralateral limbs as controls...
September 27, 2016: Lymphatic Research and Biology
Adam J Kuchnia, Levi M Teigen, Abigail J Cole, Urvashi Mulasi, M Cristina Gonzalez, Steven B Heymsfield, David M Vock, Carrie P Earthman
BACKGROUND: Raw bioimpedance parameters (eg, 50-kHz phase angle [PA] and 200-kHz/5-kHz impedance ratio [IR]) have been investigated as predictors of nutrition status and/or clinical outcomes. However, their validity as prognostic measures depends on the availability of appropriate reference data. Using a large and ethnically diverse data set, we aimed to determine if ethnicity influences these measures and provide expanded bioimpedance reference data for the U.S. POPULATION: HASH(0x41f3b60) METHODS: The National Health and Nutrition Examination Survey (NHANES) is an ongoing compilation of studies conducted by the U...
September 26, 2016: JPEN. Journal of Parenteral and Enteral Nutrition
Brett S Nickerson, Michael R Esco, Phillip A Bishop, Randall Schumacker, Mark Richardson, Michael V Fedewa, Jonathan E Wingo, Bailey A Welborn
The purpose of this study was to compare body fat percentage (BF%) and fat-free mass (FFM) values from bioelectrical impedance analysis (BIA) equations to values determined from a four-compartment (4C) model. Eighty-two adults (42 men and 40 women) volunteered to participate (age = 23 ± 5 years). BF% and FFM were estimated from previously developed BIA equations by Chumlea et al. (BIACH), Deurenberg et al. (BIADE), Kyle et al. (BIAKYLE), and Sun et al. (BIASUN). 4C model body composition was derived from underwater weighing for body density, dual energy X-ray absorptiometry for bone mineral content, and bioimpedance spectroscopy for total body water...
September 20, 2016: Journal of Strength and Conditioning Research
Paik Seong Lim, Chang Hsu Chen, Fansan Zhu, Peter Kotanko, Yachung Jeng, Chun Yu Hu, Li Shu Chiu, Hui-Chen Chang
OBJECTIVE: Obesity is becoming increasingly common in hemodialysis (HD) patients and is associated with inflammation and increased mortality. The primary aim of the present study was to evaluate the accuracy and variability of the bioimpedance device in measuring body fat in Taiwanese dialysis patients. DESIGN: Cross-sectional study. SUBJECTS: One hundred twenty-two adult patients receiving HD in a single hospital in Taiwan. SETTING: We compared the results of fat mass (FM) measured by dual-energy x-ray absorptiometry (DEXA) and bioelectrical impedance spectroscopy device (Body composition monitor, BCM)...
September 22, 2016: Journal of Renal Nutrition
Hye Eun Yoon, Young Joo Kwon, Ho Cheol Song, Jin Kuk Kim, Young Rim Song, Seok Joon Shin, Hyung Wook Kim, Chang Hwa Lee, Tae Won Lee, Young Ok Kim, Byung Soo Kim, Kyoung Hyoub Moon, Yoon Kyung Chang, Seong Suk Kim, Kitae Bang, Jong Tae Cho, Sung Ro Yun, Ki Ryang Na, Yang Wook Kim, Byoung Geun Han, Jong Hoon Chung, Kwang Young Lee, Jong Hyeok Jeong, Eun Ah Hwang, Yong-Soo Kim
UNLABELLED: Backgound: This study evaluated whether the hydration status affected health-related quality of life (HRQOL) during 12 months in peritoneal dialysis (PD) patients. METHODS: The hydration status and the HRQOL were examined at baseline and after 12 months using a bioimpedance spectroscopy and Kidney Disease Quality of Life-Short Form, respectively in PD patients. Four hundred eighty-one patients were included and divided according to the baseline overhydration (OH) value; normohydration group (NH group, -2L≤ OH ≤+2L, n=266) and overhydration group (OH group, OH >+2L, n=215)...
2016: International Journal of Medical Sciences
Gerard Amorós-Figueras, Esther Jorge, Tomás García-Sánchez, Ramón Bragós, Javier Rosell-Ferrer, Juan Cinca
Myocardial electrical impedance is a biophysical property of the heart that is influenced by the intrinsic structural characteristics of the tissue. Therefore, the structural derangements elicited in a chronic myocardial infarction should cause specific changes in the local systolic-diastolic myocardial impedance, but this is not known. This study aimed to characterize the local changes of systolic-diastolic myocardial impedance in a healed myocardial infarction model. Six pigs were successfully submitted to 150 min of left anterior descending (LAD) coronary artery occlusion followed by reperfusion...
2016: Frontiers in Physiology
Chen Huan-Sheng, Chang Yeong-Chang, Hsieh Ming-Hsing, Tseng Fan-Lieh, Lin Chu-Cheng, Wu Tsai-Kun, Chen Hung-Ping, Hung Sze-Hung, Chiu Hsien-Chang, Lee Chia-Chen, Hou Chun-Cheng, Cheng Chun-Ting, Liou Hung-Hsiang, Lin Chun-Ju, Lim Paik-Seong
PURPOSE: Fluid management with body composition monitor based on bioimpedance spectroscopy (BCM-BIS) has been found to be beneficial for dialysis patients. We conducted a study to provide an algorithm for the determination of post-dialysis target weight (PDTW) and to evaluate whether this approach could improve clinical outcomes compared to patients who had PDTW decided clinically. METHODS: Two hundred and ninety-eight dialysis patients participated in this 1-year randomized controlled trial...
November 2016: International Urology and Nephrology
Darren R Churchward, Matthew P M Graham-Brown, Robert Preston, Warren Pickering, Gerry P McCann, James O Burton
INTRODUCTION: In-centre nocturnal haemodialysis (INHD) is an underutilised dialysis regimen that can potentially provide patients with better clinical outcomes due to extended treatment times. We have established an INHD programme within our clinical network, fulfilling a previously unmet patient need. This feasibility study aims to gather sufficient data on numerous outcome measures to inform the design of a multicentre randomised controlled trial that will establish the potential benefits of INHD and increase the availability of this service nationally and internationally...
2016: BMJ Open
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...
September 7, 2016: Stem Cells Translational Medicine
Carolina Gálvez-Montón, Ramon Bragós, Carolina Soler-Boti Ja, Idoia Díaz-Güemes, Cristina Prat-Vidal, Verónica Crisóstomo, Francisco M Sánchez-Margallo, Aida Llucià-Valldeperas, Paco Bogónez-Franco, Isaac Perea-Gil, Santiago Roura, Antoni Bayes-Genis
: : Cardiac tissue engineering, which combines cells and biomaterials, is promising for limiting the sequelae of myocardial infarction (MI). We assessed myocardial function and scar evolution after implanting an engineered bioactive impedance graft (EBIG) in a swine MI model. The EBIG comprises a scaffold of decellularized human pericardium, green fluorescent protein-labeled porcine adipose tissue-derived progenitor cells (pATPCs), and a customized-design electrical impedance spectroscopy (EIS) monitoring system...
September 2, 2016: Stem Cells Translational Medicine
A P Morais, A V Pino, M N Souza
This in vitro study evaluated the diagnostic performance of an alternative electric bioimpedance spectroscopy technique (BIS-STEP) detect questionable occlusal carious lesions. Six specialists carried out the visual (V), radiography (R), and combined (VR) exams of 57 sound or non-cavitated occlusal carious lesion teeth classifying the occlusal surfaces in sound surface (H), enamel caries (EC), and dentinal caries (DC). Measurements were based on the current response to a step voltage excitation (BIS-STEP). A fractional electrical model was used to predict the current response in the time domain and to estimate the model parameters: Rs and Rp (resistive parameters), and C and α (fractional parameters)...
August 2016: Review of Scientific Instruments
Fansan Zhu, Laura Rosales, Peter Kotanko
PURPOSE OF REVIEW: The aim of this article is to present current information on techniques for fluid status assessment in patients with kidney disease. The methods can be broadly categorized into biomarkers, ultrasound, blood volume monitoring, and bioimpedance. RECENT FINDINGS: Biomarkers including atrial natriuretic peptide and B-type natriuretic peptide have been shown to provide information about relative changes in fluid status. Ultrasound is applied to measure inferior vena cava indices, pulmonary indicators, and vascular indicators of fluid overload...
November 2016: Current Opinion in Nephrology and Hypertension
María Cristina Di Gioia, Raul Gascuena, Paloma Gallar, Gabriela Cobo, Rosa Camacho, Nuria Acosta, Zsofia Baranyi, Isabel Rodriguez, Aniana Oliet, Olimpia Ortega, Inmaculada Fernandez, Carmen Mon, Milagros Ortiz, Mari C Manzano, Juan C Herrero, José I Martinez, Joaquín Palma, Ana Vigil
BACKGROUND: Chronic fluid overload is frequent in hemodialysis patients (P) and it associates with hypertension, left ventricular hypertrophy (LVH) and higher mortality. Moreover, echocardiographic data assessing fluid overload is limited. Our aim was to evaluate the relationship between fluid overload measured by bioimpedance spectroscopy (BIS) and different echocardiographic parameters. METHODS: Cross-sectional observational study including 76 stable patients...
August 26, 2016: Nefrología: Publicación Oficial de la Sociedad Española Nefrologia
Marcello Tonelli, Anita Lloyd, Neesh Pannu, Scott Klarenbach, Pietro Ravani, Kailash Jindal, Jennifer MacRae, Larry Unsworth, Braden Manns, Brenda Hemmelgarn
BACKGROUND: Rural-dwelling hemodialysis patients have less frequent contact with nephrologists than urban-dwelling patients, and are known to have higher mortality. We hypothesized that rural-dwelling hemodialysis patients would have more evidence of poorly controlled extracellular fluid volume (ECVF) than otherwise similar urban-dwellers. METHODS: We studied prevalent hemodialysis patients within a single renal program in Alberta, Canada and assessed ECFV using bioimpedance spectroscopy (BIS)...
August 23, 2016: Journal of Nephrology
Kamonwan Tangvoraphonkchai, Andrew Davenport
INTRODUCTION: Bioelectrical impedance spectroscopy (BIS) devices are being used to determine ultrafiltration requirements to achieve target weight for haemodialysis (HD) patients. Pre-dialysis measurements are more convenient for both patients and staff. We wished to compare the changes in pre- and post-dialysis hydration measured by BIS with actual weight loss. METHODS: We compared paired BIS measurements made pre and post HD using a BIS device based on a 3-compartmental model, designed to provide information on extracellular water (ECW) excess...
2016: Nephron
Chirag Shah, Frank A Vicini, Douglas Arthur
With improved breast cancer survivorship, lymphedema of the arm is a growing concern for many patients following treatment. Diagnosis and management of breast cancer related lymphedema (BCRL) is often delayed due to low sensitivity diagnostic techniques and a failure to incorporate BCRL assessments into standard clinical practice. Bioimpedance spectroscopy (BIS) is an increasingly utilized diagnostic technique that allows for the subclinical detection of BCRL, prior to clinically evident disease. We provide a summary of the data supporting the early detection and treatment of BCRL, a comparison of BCRL diagnostic modalities and data supporting the utilization of BIS...
August 4, 2016: Breast Journal
Sajith Sebastian, Christelle Filmalter, Justin Harvey, Mogamat-Yazied Chothia
BACKGROUND: Intradialytic hypertension (IDH) increases morbidity and mortality. The prevalence in South Africa is unknown. The pathogenesis is unclear, but it has been suggested that IDH may be due to subclinical fluid overload. The objective of this study was to determine the prevalence of IDH and to evaluate its association with fluid overload using bioimpedance spectroscopy (BIS). METHODS: A cross-sectional study involving 190 chronic haemodialysis patients in the Western Cape province of South Africa was conducted between January 2013 and May 2014...
August 2016: Clinical Kidney Journal
Virgilio Valente, Andreas Demosthenous
This paper presents a multi-channel dual-mode CMOS analogue front-end (AFE) for electrochemical and bioimpedance analysis. Current-mode and voltage-mode readouts, integrated on the same chip, can provide an adaptable platform to correlate single-cell biosensor studies with large-scale tissue or organ analysis for real-time cancer detection, imaging and characterization. The chip, implemented in a 180-nm CMOS technology, combines two current-readout (CR) channels and four voltage-readout (VR) channels suitable for both bipolar and tetrapolar electrical impedance spectroscopy (EIS) analysis...
2016: Sensors
Kira Bloomquist, Sandi Hayes, Lis Adamsen, Tom Møller, Karl Bach Christensen, Bent Ejlertsen, Peter Oturai
BACKGROUND: In an effort to reduce the risk of breast cancer-related arm lymphedema, patients are commonly advised to avoid heavy lifting, impacting activities of daily living and resistance exercise prescription. This advice lacks evidence, with no prospective studies investigating arm volume changes after resistance exercise with heavy loads in this population. The purpose of this study is to determine acute changes in arm volume after a session of low- and heavy-load resistance exercise among women undergoing adjuvant chemotherapy for breast cancer at risk for arm lymphedema...
2016: BMC Cancer
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"