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Bioimpedance spectroscopy

Bahar Gürlek Demirci, Siren Sezer, Emre Tutal, Turan Çolak, Saliha Uyanık, Mehmet Haberal
OBJECTIVES: In kidney transplant recipients, reduced muscle mass and hand-grip strength are associated with impaired nutritional status. Serum testosterone is highly associated with muscle strength in the general population. Here, we aimed to determine the associations among serum testosterone, hand-grip strength, and nutritional and inflammatory parameters, as well as graft function. MATERIALS AND METHODS: Our study included 144 stable male kidney transplant recipients from our renal transplant outpatient clinic...
March 2018: Experimental and Clinical Transplantation
Christopher P Kellner, Eric Sauvageau, Kenneth V Snyder, Kyle M Fargen, Adam S Arthur, Raymond D Turner, Andrei V Alexandrov
INTRODUCTION: Effective triage of patients with emergent large vessel occlusion (ELVO) to endovascular therapy capable centers may decrease time to treatment and improve outcome for these patients. Here we performed a derivation study to evaluate the accuracy of a portable, non-invasive, and easy to use severe stroke detector. METHODS: The volumetric impedance phase shift spectroscopy (VIPS) device was used to assign a bioimpedance asymmetry score to 248 subjects across three cohorts, including 41 subjects presenting as acute stroke codes at a major comprehensive stroke center (CSC), 79 healthy volunteers, and 128 patients presenting to CSCs with a wide variety of brain pathology including additional stroke codes...
March 6, 2018: Journal of Neurointerventional Surgery
Silke Haerteis, Anja Schork, Thomas Dörffel, Bernhard N Bohnert, Regina Nacken, Matthias Wörn, Mengyun Xiao, Daniel Essigke, Andrea Janessa, Alvin H Schmaier, Edward P Feener, Hans-Ulrich Häring, Marko Bertog, Christoph Korbmacher, Ferruh Artunc
AIM: Recent work has demonstrated that activation of the epithelial sodium channel (ENaC) by aberrantly filtered serine proteases causes sodium retention in nephrotic syndrome. The aim of this study was to elucidate a potential role of plasma kallikrein (PKLK) as a candidate serine protease in this context. METHODS: We analyzed PKLK in the urine of patients with chronic kidney disease (CKD, n=171) and investigated its ability to activate human ENaC expressed in Xenopus laevis oocytes...
February 28, 2018: Acta Physiologica
Hao Liu, Rong Lu, Shani Shastri, Mark Sonderman, Peter Noel Van Buren
BACKGROUND/AIMS: Extracellular volume (ECV) overload is a mortality risk factor in hemodialysis patients, but no standard approach exists to objectively assess this clinically. We aimed to quantify relationships between slopes of repeated intradialytic blood pressure (BP) measurements and ECV. METHODS: In a cross-sectional study of 71 hemodialysis patients, we calculated BP slopes from all intradialytic measurements using Gaussian regression. We measured extracellular and total body water (TBW) with bioimpedance spectroscopy...
February 13, 2018: Nephron
Keisuke Shiose, Yosuke Yamada, Keiko Motonaga, Hideyuki Takahashi
Although each gram of glycogen is well known to bind 2.7-4.0 g of water, no studies have been conducted on the effect of muscle glycogen depletion on body water distribution. We investigated changes in extracellular and intracellular water (ECW and ICW) distribution in each body segment in muscle glycogen-depletion and glycogen-recovery condition using segmental bioimpedance spectroscopy technique (BIS). Twelve male subjects consumed 7.0 body mass-1 of indigestible (glycogen-depleted group) or digestible (glycogen-recovered group) carbohydrate for 24 hours after a glycogen-depletion cycling exercise...
February 8, 2018: Journal of Applied Physiology
Jakob Orschulik, Nadine Hochhausen, Michael Czaplik, Daniel Teichmann, Steffen Leonhardt, Marian Walter
Bioimpedance measurements are used in many biomedical applications, such as Bioimpedance Spectroscopy (BIS) or Electrical Impedance Tomography (EIT). While BIS measures and analyzes the impedance in a frequency range at constant electrode positions, EIT aims to reconstruct images of the conductivity distribution from multiple measurements at different electrode positions. Our aim is to add spatial information to BIS measurements by using electrode positions focus measurements on desired regions of interest...
February 6, 2018: Physiological Measurement
Kook-Hwan Oh, Seon Ha Baek, Kwon-Wook Joo, Dong Ki Kim, Yon-Su Kim, Sejoong Kim, Yun Kyu Oh, Byoung Geun Han, Jae Hyun Chang, Wookyung Chung, Ki Young Na
INTRODUCTION: In peritoneal dialysis (PD) patients, volume overload is related to cardiac dysfunction and mortality, while intravascular volume depletion is associated with a rapid decline in the residual renal function (RRF). This study sought to determine the clinical usefulness of bioimpedance spectroscopy (BIS)-guided fluid management for preserving RRF and cardiac function in PD patients. SUBJECTS AND METHODS: This is a multicenter, prospective, open-label study that was conducted over a 1-year period (NCT01887262)...
January 31, 2018: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
Gyözö G Láng, Dora Zalka
Many electrochemical/bioelectrochemical systems are intrinsically nonstationary and are affected by time-dependent phenomena. The requirement of stationarity in the classical version of impedance spectroscopy appears to be in conflict with the essential properties of the object, therefore a post-experimental mathematical/analytical procedure is necessary for the reconstruction of the "true" impedance spectra. In this communication, a method for the correction of the impedance data is discussed.
January 29, 2018: Physiological Measurement
Pablo Molina, Belén Vizcaíno, Mariola D Molina, Sandra Beltrán, Mercedes González-Moya, Antonio Mora, Cristina Castro-Alonso, Julia Kanter, Ana I Ávila, José L Górriz, Nuria Estañ, Luis M Pallardó, Denis Fouque, Juan J Carrero
Background: Compared with conventional haemodialysis (HD), online haemodiafiltration (OL-HDF) achieves a more efficient removal of uraemic toxins and reduces inflammation, which could favourably affect nutritional status. We evaluate the effect of OL-HDF on body composition and nutritional status in prevalent high-flux HD (HF-HD) patients. Methods: In all, 33 adults with chronic kidney disease (CKD) Stage 5 undergoing maintenance HF-HD were assigned to post-dilution OL-HDF (n = 17) or to remain on HF-HD (n = 16, control group) for 12 months...
January 22, 2018: Nephrology, Dialysis, Transplantation
Linda A Koehler, David W Hunter, Anne H Blaes, Tufia C Haddad
Background: Axillary web syndrome (AWS) can develop following breast cancer surgery and presents as a tight band of tissue in the axilla with shoulder abduction. Objective: The objectives were to determine the prevalence and natural history of AWS, and the association between AWS and function, range of motion, pain, lymphedema, and body mass index (BMI). Design: This study was a longitudinal prospective cohort study utilizing a repeated measures design...
January 18, 2018: Physical Therapy
Nazanin Noori, Ron Wald, Arti Sharma Parpia, Marc B Goldstein
Background: Accurate assessment of total body water (TBW) is essential for the evaluation of dialysis adequacy (Kt/V urea ). The Watson formula, which is recommended for the calculation of TBW, was derived in healthy volunteers thereby leading to potentially inaccurate TBW estimates in maintenance hemodialysis recipients. Bioimpedance spectroscopy (BIS) may be a robust alternative for the measurement of TBW in hemodialysis recipients. Objectives: The primary objective of this study was to evaluate the accuracy of Watson formula-derived TBW estimates as compared with TBW measured with BIS...
2018: Canadian Journal of Kidney Health and Disease
Michael R Esco, Brett S Nickerson, Michael V Fedewa, Jordan R Moon, Ronald L Snarr
BACKGROUND/OBJECTIVES: The purpose was to determine if skinfolds (SF) and bioelectrical impedance analysis (BIA) could provide accurate estimates of body volume (BV) and total body water (TBW), respectively, for use in a 3-compartment (3-C) model to estimate percent body fat (BF%) when compared to laboratory derived measures. SUBJECTS/METHODS: A sample of sixty-four men (age = 22.9 ± 5.4 years) and 59 women (age = 21.6 ± 4.3 years) participated in the study...
January 18, 2018: European Journal of Clinical Nutrition
A Ruiz-Vargas, R Mohd Rosli, A Ivorra, J W Arkwright
BACKGROUND: Intraluminal electrical impedance is a well-known diagnostic tool used to study bolus movement in the human esophagus. However, it is use in the human colon it is hindered by the fact that the content cannot be controlled and may include liquid, gas, solid, or a mixture of these at any one time. This article investigates the use of complex impedance spectroscopy to study different luminal content (liquid and gas). METHODS: An excised section of guinea pig proximal colon was placed in an organ bath with Krebs solution at 37°C and a custom built bioimpedance catheter was placed in the lumen...
January 8, 2018: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
Zoya Gridneva, Alethea Rea, Anna R Hepworth, Leigh C Ward, Ching T Lai, Peter E Hartmann, Donna T Geddes
Breastfeeding has been implicated in the establishment of infant appetite regulation, feeding patterns and body composition (BC). A holistic approach is required to elucidate relationships between infant and maternal BC and contributing factors, such as breastfeeding parameters. Associations between maternal and breastfed term infant BC (n = 20) and feeding parameters during first 12 months of lactation were investigated. BC was measured at 2, 5, 9 and/or 12 months postpartum with ultrasound skinfolds (US; infants only) and bioimpedance spectroscopy (infants and mothers)...
January 5, 2018: Nutrients
Xavier Torterüe, Laurène Dehoux, Marie-Alice Macher, Olivier Niel, Thérésa Kwon, Georges Deschênes, Julien Hogan
BACKGROUND: Evaluation of patient's dry weight remains challenging in chronic hemodialysis (HD) especially in children. Inferior Vena Cava (IVC) measurement was reported useful to assess fluid overload both in adults and children. METHODS: We performed a monocentric prospective study to evaluate the relation between predialytic IVC diameter measurements and hydration status evaluated by physicians and bioimpedance spectroscopy (BIS) and between IVC measurements and persistent hypertension...
December 28, 2017: BMC Nephrology
Janet Douglass, Patricia Graves, Susan Gordon
BACKGROUND: Expected values for tissue tonometry and bioimpedance spectroscopy (BIS) in the lower extremity of young people have not been established. These measures are commonly used to assess tissue changes in adult, breast cancer-related lymphedema of the arm. In tropical regions, identification of tissue changes in the lower limbs related to lymphatic filariasis is required; hence expected values and factors contributing to variation in tissue tonometry and BIS in two tropical populations were investigated...
December 11, 2017: Lymphatic Research and Biology
Alex S Ribeiro, Matheus A Nascimento, Brad J Schoenfeld, João Pedro Nunes, Andreo F Aguiar, Edilaine F Cavalcante, Analiza M Silva, Luís B Sardinha, Steven J Fleck, Edilson S Cyrino
The main purpose of this study was compare the effects of resistance training (RT) performed two versus three times per week on phase angle (a cellular health indicator) in older women. Thirty-nine women (69.1±5.5 years) were randomly assigned to perform a RT program two (G2X) or three (G3X) days per week for 12 weeks. The RT was a whole-body program (8 exercises, 1 set, 10-15 repetitions). Phase angle, resistance, reactance, and total body water were assessed by bioimpedance spectroscopy. Intracellular water, reactance, and phase angle increased significantly in G2X (2...
November 28, 2017: Journal of Aging and Physical Activity
Brett S Nickerson, Michael R Esco, Phillip A Bishop, Brian M Kliszczewicz, Henry N Williford, Kyung-Shin Park, Bailey A Welborn, Ronald L Snarr, Danilo V Tolusso
The purpose of this study was to determine if heat exposure alters the measures of total body water (TBW), extracellular water (ECW), and intracellular water (ICW) in both single-frequency bioelectrical impedance analysis (BIA) and bioimpedance spectroscopy (BIS). Additionally, we sought to determine if any differences exist between the BIA and BIS techniques before and after brief exposure to heat. Body water was evaluated for twenty men (age=24±4 years) in a thermoneutral environment (22°C) before (PRE) and immediately after (POST) 15 min of passive heating (35°C) in an environmental chamber...
2017: International Journal of Exercise Science
Nazanin Noori, Arti Sharma Parpia, Rajiv Lakhani, Sabrina Janes, Marc B Goldstein
OBJECTIVE: Frailty among the end-stage renal disease (ESRD) population is highly prevalent and has been associated with mortality. Little is known about the relation of different aspects of body composition, a modifiable risk factor, with the risk of frailty in ESRD population. DESIGN AND METHODS: One hundred and fifty-one patients including 85 men and 66 women, aged ≥18 years with ESRD who had been receiving conventional maintenance hemodialysis (HD) for at least 3 months were included...
November 18, 2017: Journal of Renal Nutrition
Samer R Abbas, Stephan Thijssen, Erik L Penne, Jochen G Raimann, Li Liu, Murat H Sipahioglu, Eric Seibert, Yuedong Wang, Yuqi Chen, Qingqing Xiao, Nathan W Levin, Peter Kotanko, Fansan Zhu
OBJECTIVE: This prospective study uses calf bioimpedance spectroscopy (cBIS) to guide the attainment of dry weight (DWcBIS) in chronic hemodialysis (HD) patients. The primary aim of this study was to evaluate whether body composition is altered when fluid status is reduced to DWcBIS. METHODS: Target post-HD weight was gradually reduced from baseline (BL) until DWcBIS was achieved. DWcBIS was defined as the presence of both flattening of the curve of extracellular resistance and the attainment calf normalized resistivity in the normal range during the dialysis treatment...
November 18, 2017: Journal of Renal Nutrition
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