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https://www.readbyqxmd.com/read/28086939/feasibility-study-for-the-non-invasive-blood-pressure-estimation-based-on-ppg-morphology-normotensive-subject-study
#1
Hangsik Shin, Se Dong Min
BACKGROUND: Blood pressure is a critical bio-signal and its importance has been increased with the aged society and the growth of cardiovascular disease population. However, most of hypertensive patients have been suffered the inconvenience in monitoring blood pressure in daily life because the measurement of the blood pressure depends on the cuff-based technique. Nowadays there are many trials to measure blood pressure without cuff, especially, photoplethysmography (PPG) based research is carried out in various ways...
January 10, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28075344/pull-in-effect-of-suspended-microchannel-resonator-sensor-subjected-to-electrostatic-actuation
#2
Han Yan, Wen-Ming Zhang, Hui-Ming Jiang, Kai-Ming Hu
In this article, the pull-in instability and dynamic characteristics of electrostatically actuated suspended microchannel resonators are studied. A theoretical model is presented to describe the pull-in effect of suspended microchannel resonators by considering the electrostatic field and the internal fluid. The results indicate that the system is subjected to both the pull-in instability and the flutter. The former is induced by the applied voltage which exceeds the pull-in value while the latter occurs as the velocity of steady flow get closer to the critical velocity...
January 8, 2017: Sensors
https://www.readbyqxmd.com/read/28073842/expression-of-cd14-il-10-and-tolerogenic-signature-in-dendritic-cells-inversely-correlate-with-response-to-tarp-vaccination-in-prostate-cancer-patients
#3
Luciano Castiello, Marianna Sabatino, Jiaqiang Ren, Masaki Terabe, Hanh Khuu, Lauren V Wood, Jay A Berzofsky, David F Stroncek
PURPOSE: Despite the vast number of clinical trials conducted so far, Dendritic cell (DC)-based cancer vaccines have mostly shown unsatisfactory results. Factors and manufacturing procedures essential for these therapeutics to induce effective anti-tumor immune responses have yet to be fully characterized. We here aimed to identify DC markers correlating with clinical and immunological response in a prostate carcinoma vaccination regimen. EXPERIMENTAL DESIGN: We performed an extensive characterization of DCs used to vaccinate 18 prostate carcinoma patients enrolled in a pilot trial of TCR gamma alternate reading frame protein (TARP) peptide vaccination (NCT00908258)...
January 10, 2017: Clinical Cancer Research: An Official Journal of the American Association for Cancer Research
https://www.readbyqxmd.com/read/28073668/drug-eluting-stenting-for-femoropopliteal-lesions-followed-by-cilostazol-treatment-reduces-stent-restenosis-in-patients-with-symptomatic-peripheral-artery-disease
#4
Kan Zen, Mitsuyoshi Takahara, Osamu Iida, Yoshimitsu Soga, Daizo Kawasaki, Shinsuke Nanto, Hiroyoshi Yokoi, Satoaki Matoba
BACKGROUND: Cilostazol improves clinical endovascular therapy outcomes for femoropopliteal (FP) lesions in patients with symptomatic peripheral arterial disease, but whether it also has clinical benefits for patients after drug-eluting stent implantation remains unclear. METHODS: This study is a subanalysis of the ZilvEr PTX for tHe Femoral ArterY and Proximal Popliteal ArteRy (ZEPHYR) study, a prospective multicenter study investigating FP lesions treated with the Zilver (Cook Medical, Bloomington, Ind) paclitaxel-eluting stent...
January 7, 2017: Journal of Vascular Surgery
https://www.readbyqxmd.com/read/28072633/visual-motion-processing-subserves-faster-visuomotor-reaction-in-badminton-players
#5
Thorben Hülsdünker, Heiko K Strüder, Andreas Mierau
INTRODUCTION: Athletes participating in ball or racquet sports have to respond to visual stimuli under critical time pressure. Previous studies used visual contrast stimuli to determine visual perception and visuomotor reaction in athletes and non-athletes however, especially ball and racquet sports are characterized by motion rather than contrast visual cues. Since visual contrast and motion signals are processed in different cortical regions, this study aimed to determine differences in perception and processing of visual motion between athletes and non-athletes...
January 9, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28062981/body-size-from-birth-through-adolescence-in-relation-to-risk-of-benign-breast-disease-in-young-women
#6
Catherine S Berkey, Bernard Rosner, Rulla M Tamimi, Walter C Willett, Martha Hickey, Adetunji Toriola, A Lindsay Frazier, Graham A Colditz
PURPOSE: Body size, from birth throughout adulthood, is associated with breast cancer risk, but few studies have investigated early-life body size and benign breast disease (BBD), a well-established breast cancer risk factor. We consider whether prenatal factors and size at birth, 10, 18 year, and intervening growth, are related to BBD risk. METHODS: The Growing Up Today Study includes 9032 females who completed questionnaires annually from 1996 to 2001, then 2003, 2005, 2007, 2010, and 2013...
January 6, 2017: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/28061936/a-novel-model-for-the-entire-settling-thickening-process-in-a-secondary-settling-tank
#7
Zhijiang He, Yuankai Zhang, Hongchen Wang, Lu Qi, Xunfei Yin, Xiaojun Zhang, Yang Wen
  Sludge settling and thickening occur simultaneously in secondary settling tanks (SSTs). The ability to accurately calculate the settling and thickening capacity of activated sludge was of great importance. Despite extensive studies on the development of settling velocity models for use with SSTs, these models have not been applied due to the difficulty in calibrating the related parameters. Additionally, there have been some studies of the thickening behavior of the activated sludge in SSTs. In this study, a novel settling and thickening model for activated sludge was developed, and the model was validated using experimental data (R2 = 0...
December 1, 2016: Water Environment Research: a Research Publication of the Water Environment Federation
https://www.readbyqxmd.com/read/28057820/blood-flow-regulation-and-oxygen-uptake-during-high-intensity-forearm-exercise
#8
Stian Kwak Nyberg, Ole Kristian Berg, Jan Helgerud, Eivind Wang
The vascular strain is very high during heavy handgrip exercise, but the intensity and kinetics to reach peak blood flow, and peak oxygen uptake, are uncertain. We included 9 young (25±2yr) healthy males to evaluate blood flow and oxygen uptake responses during continuous dynamic handgrip exercise with increasing intensity. Blood flow was measured using Doppler-ultrasound and venous blood was drawn from a deep forearm vein to determine arteriovenous oxygen difference (a-vO2diff) during 6-minutes bouts of 60, 80 and 100% of maximal work rate (WRmax), respectively...
January 5, 2017: Journal of Applied Physiology
https://www.readbyqxmd.com/read/28057332/influence-of-geometry-and-material-of-insulating-posts-on-particle-trapping-using-positive-dielectrophoresis
#9
Georg R Pesch, Fei Du, Michael Baune, Jorg Thöming
Insulator-based dielectrophoresis (iDEP) is a powerful particle analysis technique based on electric field scattering at material boundaries which can be used, for example, for particle filtration or to achieve chromatographic separation. Typical devices consist of microchannels containing an array of posts but large scale application was also successfully tested. Distribution and magnitude of the generated field gradients and thus the possibility to trap particles depends apart from the applied field strength on the material combination between post and surrounding medium and on the boundary shape...
December 26, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28056173/self-assembly-and-viscosity-behavior-of-janus-nanoparticles-in-nanotube-flow
#10
Yusei Kobayashi, Noriyoshi Arai
Janus nanoparticles (JNPs) have received considerable attention because of their characteristic physical properties that are due to more than two distinct chemical or physical surfaces. We investigated the rheological properties of a JNP solution in the nanotubes using a computer simulation. Prediction and control of the self-assembly of colloidal nanoparticles is of critical importance in materials chemistry and engineering. Herein, we show computer simulation evidence of a new type of velocity profile and a hallmark shear-thinning behavior by confining a JNP solution to a nanotube with hydrophobic and hydrophilic wall surfaces...
January 12, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28052043/particle-tracking-for-the-assessment-of-microcirculatory-perfusion
#11
Michele Sorelli, Can Ince, Leonardo Bocchi
In recent years the development of portable microscopes, which enable the noninvasive bedside evaluation of the sublingual microcirculation in critically ill patients, has expanded the clinical research on this level of the cardiovascular system. Several semi-quantitative scores have been defined in order to provide researchers with a standardized framework for the offline assessment of the microcirculation status. Among those, space-time diagrams (STDs) constitute an established method for obtaining an estimate of the red blood cells (RBCs) flow velocity in capillaries...
January 4, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28048638/tu-d-201-04-veracity-of-data-elements-in-radiation-oncology-incident-learning-systems
#12
A Kapur, S Evans, D Brown, G Ezzell, D Hoopes, S Dieterich, K Kapetanovic, C Tomlinson
PURPOSE: Incident learning systems encompass volumes, varieties, values, and velocities of underlying data elements consistent with the V's of big data. Veracity, the 5th V however exists only if there is high inter-rater reliability (IRR) within the data elements. The purpose of this work was to assess IRR in the nationally deployed RO-ILS: Radiation Oncology-Incident Learning System (R) sponsored by the American Society for Radiation Oncology (ASTRO) and the American Association of Physicists in Medicine (AAPM)...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046444/su-d-207a-01-female-pelvic-synthetic-ct-generation-based-on-joint-shape-and-intensity-analysis
#13
L Liu, S Jolly, Y Cao, K Vineberg, J Fessler, J Balter
PURPOSE: To develop a method for generating female pelvic synthetic CT (MRCT) images from a single MR scan and evaluate its utility in radiotherapy. METHODS: Under IRB-approval, an imaging sequence (T1_VIBE_Dixon) was acquired for 10 patients. This sequence yields 3 useful image volumes of different contrast ("in-phase" T1-weighted, fat and water). A previously published pelvic bone shape model was used to generate a rough bone mask for each patient. A modified fuzzy c-means classification was performed on the multi spectral MR data, with a regularization term that utilizes the prior knowledge provided by the bone mask and addresses the intensity overlap between different tissue types...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28045338/systolic-mitral-annulus-velocity-is-a-sensitive-index-for-changes-in-left-ventricular-systolic-function-during-inotropic-therapy-in-patients-with-acute-heart-failure
#14
Trygve Husebye, Jan Eritsland, Reidar Bjørnerheim, Geir Ø Andersen
BACKGROUND: Echocardiography is recommended for assessment of left ventricular systolic function in patients with acute heart failure but few randomised trials have validated techniques like tissue Doppler (TDI) and speckle tracking (STE) in patients with acute heart failure following ST-elevation myocardial infarction. METHODS: This was a substudy from the LEAF (LEvosimendan in Acute heart Failure following myocardial infarction) trial (NCT00324766 ), which randomised 61 patients developing acute heart failure, including cardiogenic shock, within 48 hours after ST-elevation myocardial infarction, double-blind to a 25-hour infusion of levosimendan or placebo...
January 1, 2017: European Heart Journal. Acute Cardiovascular Care
https://www.readbyqxmd.com/read/28040004/oscillatory-fluid-flow-in-deformable-tubes-implications-for-pore-scale-hydromechanics-from-comparing-experimental-observations-with-theoretical-predictions
#15
Patrick Kurzeja, Holger Steeb, Marc A Strutz, Jörg Renner
Oscillatory flow of four fluids (air, water, two aqueous sodium-tungstate solutions) was excited at frequencies up to 250 Hz in tubes of two materials (steel, silicone) covering a wide range in length, diameter, and thickness. The hydrodynamical response was characterized by phase shift and amplitude ratio between pressures in an upstream (pressure excitation) and a downstream reservoir connected by the tubes. The resulting standing flow waves reflect viscosity-controlled diffusive behavior and inertia-controlled wave behavior for oscillation frequencies relatively low and high compared to Biot's critical frequency, respectively...
December 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28039280/selection-of-critical-isthmus-in-scar-related-atrial-tachycardia-using-a-new-automated-ultrahigh-resolution-mapping-system
#16
Decebal Gabriel Laţcu, Sok-Sithikun Bun, Frédéric Viera, Tahar Delassi, Mohammed El Jamili, Alaa Al Amoura, Nadir Saoudi
BACKGROUND: Accurate activation mapping of reentrant scar-related atrial tachycardias (AT) allows efficient radiofrequency ablation by targeting the critical isthmus (CI). We aimed to assess the electrophysiological properties of CI channels during mapping with the IntellaMap Orion basket and the Rhythmia system. METHODS AND RESULTS: We prospectively studied 33 AT (post- atrial fibrillation ablation or surgical mitral valve repair). The noise of bipolar electrogram (EGM) was systematically measured at 10 prespecified sites, as well as on a standard catheter and on the surface ECG...
January 2017: Circulation. Arrhythmia and Electrophysiology
https://www.readbyqxmd.com/read/28031762/effects-of-fatigue-on-throwing-performance-in-experienced-team-handball-players
#17
Alberto Nuño, Ignacio J Chirosa, Roland van den Tillaar, Rafael Guisado, Ignacio Martín, Isidoro Martinez, Luis J Chirosa
The purpose of this study was to investigate the effect of central and peripheral physiological fatigue on throwing accuracy and ball release velocity in team handball. Twenty male subjects (age 24.7 ± 3.9 yrs, body mass 88.5 ± 5.0 kg, body height 1.86 ± 0.05 m, training experience 12.7 ± 3.8 yrs) from one handball team participated in this study. The participants completed four sets of eight laps of a circuit that consisted of specific team handball drills/exercises, with decreasing recovery times between the laps in each set in order to induce physiological fatigue...
December 1, 2016: Journal of Human Kinetics
https://www.readbyqxmd.com/read/28030505/ultrasound-assessment-of-volume-responsiveness-in-critically-ill-surgical-patients-two-measurements-are-better-than-one
#18
Sarah B Murthi, Syeda Fatima, Ashely R Menne, Jacob J Glaser, Samuel M Galvagno, Stephen Biederman, Stephen Biederman, Raymond Fang, Hegang Chen, Thomas M Scalea
BACKGROUND: The intended physiologic response to a fluid bolus is an increase in stroke volume (SV). Several ultrasound (US) measures have been shown to be predictive. The best measure(s) in critically ill surgical patients remains unclear. METHODS: This is a prospective observational study in critically ill surgical patients receiving a bolus of crystalloid, colloid or blood. A transthoracic echocardiogram (TTE) was performed before (pre-TTE) and after. A positive volume response (+VR) was defined as a ≥15% increase in SV...
December 23, 2016: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/28028863/stress-and-gender-effects-on-prefrontal-cortex-oxygenation-levels-assessed-during-single-and-dual-task-walking-conditions
#19
Roee Holtzer, Chelsea Schoen, Eleni Demetriou, Jeannette R Mahoney, Meltem Izzetoglu, Cuiling Wang, Joe Verghese
The ability to walk is critical for functional independence and wellbeing. The pre-frontal cortex (PFC) plays a key role in cognitive control of locomotion, notably under attention-demanding conditions. Factors that influence brain responses to cognitive demands of locomotion, however, are poorly understood. Herein, we evaluated the individual and combined effects of gender and perceived stress on stride velocity and PFC Oxygenated Hemoglobin (HbO2 ) assessed during single and dual-task walking conditions. The experimental paradigm included Normal Walk (NW); Cognitive Interference (Alpha); and Walk-While-Talk (WWT) tasks...
December 28, 2016: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28028847/muscle-excitability-during-sustained-maximal-voluntary-contractions-by-a-separate-analysis-of-the-m-wave-phases
#20
J Rodriguez-Falces, N Place
This study was designed to examine separately the changes in the first and second phases of the muscle compound action potential (M-wave) during and after a sustained 3-minutes maximal voluntary contraction (MVC). M-waves were evoked by supramaximal single shocks to the femoral nerve given at 10-seconds intervals throughout a sustained isometric 3-minutes MVC and also during six brief MVCs performed throughout a 30-minutes recovery period. The amplitude, duration, and area of the M-wave first and second phases, together with muscle conduction velocity and force, were measured...
December 28, 2016: Scandinavian Journal of Medicine & Science in Sports
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