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Bioimpedance spectroscopy hand

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https://www.readbyqxmd.com/read/27821919/bioelectrical-impedance-analysis-for-severe-stroke-patients-with-upper-extremity-hemiplegia
#1
Chanuk Yoo, Jaehyung Kim, Yeongae Yang, Jinsu Lee, Gyerok Jeon
[Purpose] This study is to analyze bioimpedance parameters and occupational assessment for severe stroke patients with upper extremity hemiplegia. [Subjects and Methods] Experimental subjects were 20 hemiplegic stroke patients receiving rehabilitation therapy between November to October, 2015. Prediction marker (PM), and phase angle (θ), a nd characteristic frequency (fc) were measured using bioelectrical impedance spectroscopy (MultiScan 5000). Bioelectrical impedance vector analysis (BIVA) was also obtained from the bioimpedance data...
October 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/27811407/improved-electrode-positions-for-local-impedance-measurements-in-the-lung-a-simulation-study
#2
Jakob Orschulik, Rudolf Petkau, Tobias Wartzek, Nadine Hochhausen, Michael Czaplik, Steffen Leonhardt, Daniel Teichmann
Impedance spectroscopy can be used to analyze the dielectric properties of various materials. In the biomedical domain, it is used as bioimpedance spectroscopy (BIS) to analyze the composition of body tissue. Being a non-invasive, real-time capable technique, it is a promising modality, especially in the field of lung monitoring. Unfortunately, up to now, BIS does not provide any regional lung information as the electrodes are usually placed in hand-to-hand or transthoracic configurations. Even though transthoracic electrode configurations are in general capable of monitoring the lung, no focusing to specific regions is achieved...
November 4, 2016: Physiological Measurement
https://www.readbyqxmd.com/read/27677366/changes-in-body-composition-following-haemodialysis-as-assessed-by-bioimpedance-spectroscopy
#3
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
https://www.readbyqxmd.com/read/26365564/alternate-electrode-placement-for-whole-body-and-segmental-bioimpedance-spectroscopy
#4
T L Grisbrook, P Kenworthy, M Phillips, P M Gittings, F M Wood, D W Edgar
Bioimpedance spectroscopy (BIS) is frequently used to monitor body fluid and body composition in healthy and clinical populations. BIS guidelines state that there should be no skin lesions at the site of electrodes, and if lesions are present, electrode positions should be changed. However, alternate electrode positions are yet to be reported. This study aimed to determine if ventral electrode placements were suitable alternatives for whole body and segmental BIS measurements. Three alternate electrode placements were assessed for whole body BIS using a combination of ventral hand and foot electrode placements...
October 2015: Physiological Measurement
https://www.readbyqxmd.com/read/25495384/the-importance-of-detection-of-subclinical-lymphedema-for-the-prevention-of-breast-cancer-related-clinical-lymphedema-after-axillary-lymph-node-dissection-a-prospective-observational-study
#5
COMPARATIVE STUDY
Atilla Soran, Tolga Ozmen, Kandace P McGuire, Emilia J Diego, Priscilla F McAuliffe, Marguerite Bonaventura, Gretchen M Ahrendt, Lori DeGore, Ronald Johnson
PURPOSE: Early detection and timely intervention have potential to reduce late-stage lymphedema (LE) in patients with breast cancer undergoing axillary lymph node dissection (ALND). This study aims to determine if detection and early treatment of subclinical LE by using prospective monitoring with bioimpedance spectroscopy (BIS) can lead to reduced development of clinical LE. METHODS AND RESULTS: Subclinical LE was prospectively detected using an L-Dex(®) U400 analyzer to measure BIS in 186 patients who underwent ALND between 2010 and 2013 through our LE monitoring program...
December 2014: Lymphatic Research and Biology
https://www.readbyqxmd.com/read/24837521/segmental-impedance-thresholds-for-early-detection-of-unilateral-upper-limb-swelling
#6
B J Svensson, E S Dylke, L C Ward, S L Kilbreath
BACKGROUND: Detection of early lymphedema is important for effective treatment outcome and reduction of disease burden. The aims of this study were to determine normal inter-limb variance in the hand and four segments of the arm using bioimpedance spectroscopy (BIS) to provide diagnostic thresholds for detection of early lymphedema development, to determine the intra-rater reliability of these measurements, and to compare the inter-limb BIS ratios to differences based on arm circumference measures...
December 2015: Lymphatic Research and Biology
https://www.readbyqxmd.com/read/24021716/harmonic-impedance-spectra-identification-from-time-varying-bioimpedance-theory-and-validation
#7
B Sanchez, E Louarroudi, R Bragos, R Pintelon
The harmonic impedance spectra (HIS) of a time-varying bioimpedance Z(ω, t) is a new tool to better understand and describe complex time-varying biological systems with a distinctive periodic character as, for example, cardiovascular and respiratory systems. In this paper, the relationship between the experimental setup and the identification framework for estimating Z(ω, t) is set up. The theory developed applies to frequency response based impedance measurements from noisy current-voltage observations. We prove theoretically and experimentally that a voltage source (VS) and a current source (CS) analogue front end-based measurement lead, respectively, to a closed-loop and an open-loop HIS identification problem...
October 2013: Physiological Measurement
https://www.readbyqxmd.com/read/23188815/use-of-impedance-ratios-to-assess-hand-swelling-in-lymphoedema
#8
E S Dylke, H Alsobayel, L C Ward, M Liu, E Webb, S L Kilbreath
OBJECTIVES: To determine whether bioimpedance spectroscopy was suitable for detection of hand lymphoedema. METHODS: The hands of 50 participants without a history of lymphoedema were measured with perometry and bioimpedance spectroscopy after positioning two ways for three minutes: (a) both hands rested at heart height and (b) the dominant hand at heart height and the non-dominant hand at head height. In addition, 10 women with secondary hand lymphoedema were also measured...
March 2014: Phlebology
https://www.readbyqxmd.com/read/23147642/bioimpedance-spectroscopy-as-a-measure-of-physical-functioning-in-nursing-home-residents
#9
RANDOMIZED CONTROLLED TRIAL
Mikko P Björkman, Harriet Finne-Soveri, Taru K Pilvi, Reijo S Tilvis
BACKGROUND AND AIMS: Intracellular resistance (Ri), a raw measure of bioimpedance spectroscopy (BIS), has been suggested for assessment of muscle health. The associations of repeated BIS measurements with functioning and nutritional status were investigated in nursing home residents suffering from poor health and disabilities. METHODS: A total of 106 nursing home residents (age 83±8 yrs, 75% women) were recruited. Whole body and calf BIS measures (lean body mass, resistance at 50 kHz, and Ri), height and calf electrode distance (D) were used to calculate six muscle indices...
December 2012: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/22720663/measurement-of-hand-volume-by-bioelectrical-impedance-spectroscopy
#10
L C Ward, E S Dylke, S L Kilbreath
BACKGROUND: Assessment of lymphedema is frequently based upon measuring the increase in volume of the affected region compared to that of a comparable unaffected region. This requires methods that can measure the volume of body regions that are not only accurate and sensitive but also suitable for use in clinical practice. To date, bioimpedance spectroscopy has been used to measure volume increase due to lymphedema in whole arms but excluding the hand. We report here an impedance-based method for the measurement of hand volume...
June 2012: Lymphatic Research and Biology
https://www.readbyqxmd.com/read/22187971/association-between-oral-health-and-body-cell-mass-in-hospitalised-elderly
#11
Kirsten Solemdal, Leiv Sandvik, Christina Møinichen-Berstad, Karina Skog, Tiril Willumsen, Morten Mowe
OBJECTIVE: To examine whether oral health in hospitalised elderly was associated with body cell mass (BCM) measured with Bioimpedance spectroscopy. BACKGROUND: Body cell mass is the tissue producing the metabolic work necessary for all body functions. BCM is mainly muscle tissue. Low BCM is associated with diseases, ageing and poor nutritional status. Reduced oral health is also associated with these parameters; thus, BCM and oral health may be related. METHODS: Body cell mass was measured using Bioimpedance spectroscopy in 138 acutely hospitalised elderly ≥70 years...
June 2012: Gerodontology
https://www.readbyqxmd.com/read/20405231/model-based-correction-of-the-influence-of-body-position-on-continuous-segmental-and-hand-to-foot-bioimpedance-measurements
#12
Guillermo Medrano, Frank Eitner, Marian Walter, Steffen Leonhardt
Bioimpedance spectroscopy (BIS) is suitable for continuous monitoring of body water content. The combination of body posture and time is a well-known source of error, which limits the accuracy and therapeutic validity of BIS measurements. This study evaluates a model-based correction as a possible solution. For this purpose, an 11-cylinder model representing body impedance distribution is used. Each cylinder contains a nonlinear two-pool model to describe fluid redistribution due to changing body position and its influence on segmental and hand-to-foot (HF) bioimpedance measurements...
June 2010: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/18640935/lymphedema-after-breast-cancer-incidence-risk-factors-and-effect-on-upper-body-function
#13
Sandra C Hayes, Monika Janda, Bruce Cornish, Diana Battistutta, Beth Newman
PURPOSE: Secondary lymphedema is associated with adverse physical and psychosocial consequences among women with breast cancer (BC). This article describes the prevalence and incidence of lymphedema between 6 and 18 months after BC treatment; personal, treatment, and behavioral correlates of lymphedema status; and the presence of other upper-body symptoms (UBS) and function (UBF). PATIENTS AND METHODS: A population-based sample of Australian women (n = 287) with recently diagnosed, invasive BC were evaluated on five occasions using bioimpedance spectroscopy...
July 20, 2008: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/16254072/segment-specific-resistivity-improves-body-fluid-volume-estimates-from-bioimpedance-spectroscopy-in-hemodialysis-patients
#14
COMPARATIVE STUDY
F Zhu, M K Kuhlmann, G A Kaysen, S Sarkar, C Kaitwatcharachai, R Khilnani, L Stevens, E F Leonard, J Wang, S Heymsfield, N W Levin
Discrepancies in body fluid estimates between segmental bioimpedance spectroscopy (SBIS) and gold-standard methods may be due to the use of a uniform value of tissue resistivity to compute extracellular fluid volume (ECV) and intracellular fluid volume (ICV). Discrepancies may also arise from the exclusion of fluid volumes of hands, feet, neck, and head from measurements due to electrode positions. The aim of this study was to define the specific resistivity of various body segments and to use those values for computation of ECV and ICV along with a correction for unmeasured fluid volumes...
February 2006: Journal of Applied Physiology
https://www.readbyqxmd.com/read/15798245/electrical-bioimpedance-readings-increase-with-higher-pressure-applied-to-the-measuring-probe
#15
COMPARATIVE STUDY
C A González-Correa, B H Brown, R H Smallwood, D C Walker, K D Bardhan
Electrical bioimpedance spectroscopy (EBIS) is a technique that uses a probe to calculate the transfer impedance from tissues. This transfer impedance can give information about the normal or pathological condition of the tissue. To take readings, pressure has to be applied to the probe in order to get a good contact between the electrodes and the tissue. We have been using EBIS to investigate the early diagnosis of dysplasia and cancer in the human cervix, oesophagus and bladder. We have found that, with increasing pressure (range used here was approximately 1 kPa to approximately 50 kPa), the resistivity readings increase in a consistent way up to 80%...
April 2005: Physiological Measurement
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