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"Phase angle"

Stefano Uccella, Maria Cristina Mele, Lorena Quagliozzi, Emanuele Rinninella, Camilla Nero, Serena Cappuccio, Marco Cintoni, Antonio Gasbarrini, Giovanni Scambia, Anna Fagotti
OBJECTIVE: To investigate whether patients' altered body composition (measured with bioimpedentiometry), due to a poor nutritional status, predicts the incidence of no residual disease at primary debulking and the risk of complications in patients with newly-diagnosed advanced epithelial ovarian cancer (EOC). METHODS: Data regarding patients with newly-diagnosed stage IIIC-IV EOC undergoing elective nutritional assessment between December 2016 and March 2017, were prospectively collected...
March 14, 2018: Gynecologic Oncology
Jéssica Cumpian-Silva, Ana Elisa Madalena Rinaldi, Camila Medeiros da Silva Mazzeti, Wolney Lisboa Conde
The study aims to describe body phenotypes estimated by multivariate technique for the assessment of nutritional status in adolescence during the process of sexual maturation. The sample consisted of 833 schoolchildren 10 to 15 years of age, selected by complex sampling in Piracicaba, São Paulo State, Brazil. Body phenotypes were defined by principal components analysis (PCA) based on anthropometric data (body mass, height, skinfolds, and waist circumference), body composition (phase angle measurement by bioelectric impedance), biochemical parameters (triglycerides, glucose, total/LDL cholesterol ratio, hemoglobin), and sexual maturation (self-classification of stages of pubic hair and breasts or genitals)...
March 12, 2018: Cadernos de Saúde Pública
Matthew Tabinor, Emma Elphick, Michael Dudson, Chun Shing Kwok, Mark Lambie, Simon J Davies
Both overhydration and comorbidity predict mortality in end-stage kidney failure (ESKF) but it is not clear whether these are independent of one another. We undertook a systematic review of studies reporting outcomes in adult dialysis patients in which comorbidity and overhydration, quantified by whole body bioimpedance (BI), were reported. PubMed, EMBASE, PsychInfo and the Cochrane trial database were searched (1990-2017). Independent reviewers appraised studies including methodological quality (assessed using QUIPS)...
March 13, 2018: Scientific Reports
Lea M Gerischer, Andreas Fehlner, Theresa Köbe, Kristin Prehn, Daria Antonenko, Ulrike Grittner, Jürgen Braun, Ingolf Sack, Agnes Flöel
Dementia due to Alzheimer's Disease (AD) is a neurodegenerative disease for which treatment strategies at an early stage are of great clinical importance. So far, there is still a lack of non-invasive diagnostic tools to sensitively detect AD in early stages and to predict individual disease progression. Magnetic resonance elastography (MRE) of the brain may be a promising novel tool. In this proof-of-concept study, we investigated whether multifrequency-MRE (MMRE) can detect differences in hippocampal stiffness between patients with clinical diagnosis of dementia due to AD and healthy controls (HC)...
2018: NeuroImage: Clinical
Urvashi Mulasi, David M Vock, Adam J Kuchnia, Gautam Jha, Naomi Fujioka, Venkatesh Rudrapatna, Manish R Patel, Levi Teigen, Carrie P Earthman
BACKGROUND: Using the Academy of Nutrition and Dietetics and American Society for Parenteral and Enteral Nutrition (Academy/ASPEN) Consensus malnutrition definition, we estimated malnutrition prevalence in a sample of individuals with head and neck cancer (HNC) and compared it with the Patient-Generated Subjective Global Assessment (PG-SGA). We also investigated the utility of the 50-kHz phase angle (PA) and 200-kHz/5-kHz impedance ratio (IR) to identify malnutrition. MATERIALS AND METHODS: Nineteen individuals (18 males, 1 female) scheduled to undergo chemoradiotherapy were seen at 5 time points during and up to 3 months after treatment completion...
January 2018: JPEN. Journal of Parenteral and Enteral Nutrition
Lili Niu, Xiliang Zhu, Min Pan, Abbott Derek, Lisheng Xu, Long Meng, Hairong Zheng
BACKGROUND: Many studies have demonstrated that the geometry of the carotid bifurcation enables prediction of blood flow variation associated with atherosclerotic plaque formation. The phase angle between the arterial wall circumferential strain and its instantaneous wall shear stress is known as stress phase angle (SPA). This parameter is used to evaluate hemodynamic factors of atherogenesis. Note that SPA can be numerically computed for the purpose of locating atherosclerosis in different artery geometries...
March 2, 2018: Biomedical Engineering Online
Samadhan A Pawar, Raman I Sujith, Benjamin Emerson, Tim Lieuwen
The hydrodynamic stability of a reacting wake depends primarily on the density ratio [i.e., ratio of unburnt gas density (ρu ) to burnt gas density (ρb )] of the flow across the wake. The variation of the density ratio from high to low value, keeping ρu /ρb >1, transitions dynamical characteristics of the reacting wake from a linearly globally stable (or convectively unstable) to a globally unstable mode. In this paper, we propose a framework to analyze the effect of harmonic forcing on the deterministic and synchronization characteristics of reacting wakes...
February 2018: Chaos
Luise V Marino, Michael J Griksaitis, John V Pappachan
We have previously shown that children with a bioelectrical impedance spectroscopy phase angle at 50° (PA 50°) of <2.7 on postoperative day 2 had a four-fold increase in the risk of prolonged paediatric intensive care length of stay. In this study, we demonstrate a relationship between a baseline measure of phase angle 200/5° and postoperative length of stay.
March 1, 2018: Cardiology in the Young
Jackie D Zehr, Samuel J Howarth, Tyson A C Beach
Low-back disorder risk can be modulated by pelvis-thorax coordination when lifting. To objectively discriminate between coordination patterns during lifting, the analytical methods used require evaluation. The primary study objective was to determine if continuous relative phase (CRP) and vector coding (VC) analyses can discriminate between lifting techniques that differ based on biomechanical risk criteria. The secondary objective was to determine if normalization/transformation of input segmental angular position and velocity data is required to discriminate between lifting techniques...
February 16, 2018: Journal of Electromyography and Kinesiology
Kyle M Jones, Carol A Stuehm, Charles C Hsu, Phillip H Kuo, Mark D Pagel, Edward A Randtke
Performing chemical exchange saturation transfer (CEST) magnetic resonance imaging (MRI) in lung tissue is difficult because of motion artifacts. We, therefore, developed a CEST MRI acquisition and analysis method that performs retrospective respiration gating. Our method used an acquisition scheme with a short 200-millisecond saturation pulse that can accommodate the timing of the breathing cycle, and with saturation applied at frequencies in 0.03-ppm intervals. The Fourier transform of each image was used to calculate the difference in phase angle between adjacent pixels in the longitudinal direction of the respiratory motion...
December 2017: Tomography: a Journal for Imaging Research
Kazi Sadman, Clinton G Wiener, R A Weiss, Christopher C White, Kenneth R Shull, Bryan D Vogt
In the inertial limit, the resonance frequency of the quartz crystal microbalance (QCM) is related to the coupled mass on the quartz sensor through the Sauerbrey expression that relates the mass to the change in resonance frequency. However, when the thickness of the film is sufficiently large, the relationship becomes more complicated and both the frequency and damping of the crystal resonance must be considered. In this regime, a rheological model of the material must be used to accurately extract the adhered film's thickness, shear modulus, and viscoelastic phase angle from the data...
February 23, 2018: Analytical Chemistry
Hanneke Buter, Janny A Veenstra, Matty Koopmans, Christiaan E Boerma
INTRODUCTION: Malnutrition at the time of ICU admission is associated with an increased morbidity and mortality. Malnutrition is most often assessed by a questionnaire but can also be determined with bio-impedance and measurement of phase angle. In a single-centre observational study we compared the percentage of malnutrition in patients admitted to our ICU, according to the Short Nutritional Assessment Questionnaire (SNAQ) with the phase angle measured with bio-impedance. Furthermore, we questioned whether malnutrition is related to outcome parameters...
February 2018: Clinical Nutrition ESPEN
Rosanne Maria van Diepen, Ali Mazaheri
Many studies have now consistently reported that the phase angle of ongoing oscillatory activity (measured using EEG/MEG), at time of stimulus presentation influences detection when stimuli are near-threshold. However, studies examining whether the adjustment of the phase angle of oscillations is under top-down attentional control have thus far yielded conflicting results. A possible source for the discrepancy could be that the estimation of the phase of ongoing oscillations as well as its uniformity across trials could be affected by task induced changes in the power of oscillations or concurrent evoked responses...
February 14, 2018: Scientific Reports
Teresa Małecka-Massalska, Joanna Popiołek, Mariusz Teter, Iwona Homa-Mlak, Mariola Dec, Agata Makarewicz, Hanna Karakuła-Juchnowicz
The evaluation of the nutrition status of patients has been the subject of interest of many scientific disciplines. Any deviation from normal values is a serious clinical problem. There are multiple nutrition status evaluation methods used including diet history, scales and questionnaires, physical examination, anthropometric measurements, biochemical measurements, function tests, as well as bioelectric impedance analysis or adipometry. Phase angle, obtained by means of bioelectric impedance analysis, is another parameter that is being more and more frequently applied in nutrition status monitoring...
December 30, 2017: Psychiatria Polska
Helem Sena Ribeiro, Sílvia Fernandes Maurício, Thales Antônio da Silva, Simone de Vasconcelos Generoso, Agnaldo Soares Lima, Maria Isabel Toulson Davisson Correia
OBJECTIVES: Nutritional diagnosis is essential given that malnutrition negatively affects morbidity and mortality in patients with liver disease. In the absence of a standard method, limited accuracy has been reported in relation to nutritional assessment. The aim of the study was to evaluate the use of subjective global assessment (SGA) and different methods of nutritional assessment, isolated and in combination with SGA to predict clinical outcomes. METHODS: This was a longitudinal study with patients waiting for liver transplantation...
March 2018: Nutrition
Ramin Oftadeh, Brianne K Connizzo, Hadi Tavakoli Nia, Christine Ortiz, Alan J Grodzinsky
In this study, a poroviscoelastic finite element model (FEM) was developed and used in conjunction with an AFM-based wide-bandwidth nanorheology system to predict the frequency-dependent mechanical behavior of tendon and dermis subjected to compression via nanoindentation. The aim was to distinguish between loading rates that are dominated by either poroelasticity, viscoelasticity, or the superposition of these processes. Using spherical probe tips having different radii, the force and tip displacement were measured and the magnitude, |E∗|, and phase angle, ϕ, of the dynamic complex modulus were evaluated for mouse supraspinatus tendon and mouse dermis...
February 6, 2018: Acta Biomaterialia
Francesca de Blasio, Ada Di Gregorio, Francesco de Blasio, Andrea Bianco, Barbara Bellofiore, Luca Scalfi
BACKGROUND: Various criteria have been used so far for the diagnosis of malnutrition or sarcopenia in patients suffering from chronic obstructive pulmonary disease (COPD). OBJECTIVE: To determine the prevalence of malnutrition and sarcopenia in COPD, as defined by international diagnostic criteria, and determine their relationships with raw BIA variables. METHODS: Two-hundred and sixty-three COPD patients (185 males and 78 females) underwent both clinical examination and respiratory, anthropometric, bioelectrical impedance analysis (BIA raw variables: phase angle and impedance ratio), handgrip strength (HGS), 4 m gait speed and biochemical measurements...
January 2018: Respiratory Medicine
Josely Correa Koury, Astrogildo Vianna de Oliveira-Junior, Mariana Ribeiro Costa Portugal, Karla de Jesus Fernandes de Oliveira, Carmen Marino Donangelo
Phase angle (PA) is derived from resistance and reactance determined by bioimpedance analysis (BIA) and it appears to relate to cellular stability and integrity. Interpretation of PA values could be complemented by bioelectrical impedance vector analysis (BIVA), which relates to body hydration and structure. Body composition, age, sex, and nutrients are known to stabilize cell membranes, such as zinc, have been related to PA although information is scarce in adolescent athletes. The aim of the present study was to assess the association of body composition, skeletal maturity and zinc biochemical indices with phase angle and bioelectrical impedance parameters, in forty male adolescent soccer athletes (13...
March 2018: Journal of Trace Elements in Medicine and Biology
Natalia de Moraes Santana, Claudia Porto Sabino Pinho, Cristiane Pereira da Silva, Natalia Fernandes Dos Santos, Roberta Maria Lins Mendes
BACKGROUND: Phase angle (PhA) has been proposed as a parameter to predict clinical outcomes and mortality for various diseases. Several studies have considered it an important nutrition assessment tool. However, the usefulness of this parameter as a sarcopenia marker has not yet been evaluated. This study was developed to evaluate the performance of PhA as a sarcopenia marker in hospitalized elderly patients. MATERIALS AND METHODS: This was a cross-sectional study involving elderly patients admitted to a hospital in northeastern Brazil...
February 3, 2018: Nutrition in Clinical Practice
Zoélia Camila Moura Bessa, Paula Rocha De Melo, Bruno S B Gonçalves, Carolina V M De Azevedo
In marmosets, social synchrony between circadian profiles of activity is stronger in animals that cohabit in a family. The activity of three breeding pairs was recorded by actiwatches to investigate the mechanisms involved in the synchrony between the circadian activity profiles during cohabitation in marmoset reproductive pairs. The dyads were submitted to LD 12:12 (21 days) and LL: 1) cohabitation (24 days), 2) removal of the cage mate (20 days), 3) reintroduction of the mate into the cage of the 1st situation (30 days) and 4) removal of the cage mate (7 days)...
January 26, 2018: Chronobiology International
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