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https://www.readbyqxmd.com/read/28098965/continuous-tuning-of-phase-transition-temperature-in-vo2-thin-films-on-c-cut-sapphire-substrates-via-strain-variation
#1
Jie Jian, Xuejing Wang, Leigang Li, Meng Fan, Wenrui Zhang, Jijie Huang, Zhimin Qi, Haiyan Wang
Vanadium dioxide (VO2) thin films with controlled thicknesses are deposited on c-cut sapphire substrates with Al-doped ZnO (AZO) buffer layers by pulsed laser deposition. The surface roughness of AZO buffer layers is varied by controlling oxygen pressure during growth. The strain in the VO2 lattice is found to be dependent on the VO2 thickness and the VO2/AZO interface roughness. The semiconductor-to-metal transition (SMT) properties of VO2 thin films are characterized and the transition temperature (Tc) is successfully tuned by the VO2 thickness as well as the VO2/AZO interface roughness...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28086939/feasibility-study-for-the-non-invasive-blood-pressure-estimation-based-on-ppg-morphology-normotensive-subject-study
#2
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/28048367/th-a-207b-00-shear-wave-imaging-and-a-qiba-us-biomarker-update
#3
Paul Carson
: Imaging of tissue elastic properties is a relatively new and powerful approach to one of the oldest and most important diagnostic tools. Imaging of shear wave speed with ultrasound is has been added to most high-end ultrasound systems. Understanding this exciting imaging mode aiding its most effective use in medicine can be a rewarding effort for medical physicists and other medical imaging and treatment professionals. Assuring consistent, quantitative measurements across the many ultrasound systems in a typical imaging department will constitute a major step toward realizing the great potential of this technique and other quantitative imaging...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047721/th-a-207b-01-basics-and-current-implementations-of-ultrasound-imaging-of-shear-wave-speed-and-elasticity
#4
S Chen
: Imaging of tissue elastic properties is a relatively new and powerful approach to one of the oldest and most important diagnostic tools. Imaging of shear wave speed with ultrasound is has been added to most high-end ultrasound systems. Understanding this exciting imaging mode aiding its most effective use in medicine can be a rewarding effort for medical physicists and other medical imaging and treatment professionals. Assuring consistent, quantitative measurements across the many ultrasound systems in a typical imaging department will constitute a major step toward realizing the great potential of this technique and other quantitative imaging...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047072/th-a-207b-02-qiba-ultrasound-elasticity-imaging-system-biomarker-qualification-and-user-testing-of-systems
#5
B Garra
: Imaging of tissue elastic properties is a relatively new and powerful approach to one of the oldest and most important diagnostic tools. Imaging of shear wave speed with ultrasound is has been added to most high-end ultrasound systems. Understanding this exciting imaging mode aiding its most effective use in medicine can be a rewarding effort for medical physicists and other medical imaging and treatment professionals. Assuring consistent, quantitative measurements across the many ultrasound systems in a typical imaging department will constitute a major step toward realizing the great potential of this technique and other quantitative imaging...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28039242/non-invasive-assessment-of-fluid-responsiveness-using-cnap%C3%A2-technology-is-interchangeable-with-invasive-arterial-measurements-during-major-open-abdominal-surgery
#6
J Renner, M Gruenewald, M Hill, L Mangelsdorff, H Aselmann, C Ilies, M Steinfath, O Broch
BACKGROUND: Dynamic variables of fluid responsiveness (FR), such as pulse pressure variation (PPV), have been shown to predict the response to a fluid challenge accurately. A recently introduced non-invasive technology based on the volume-clamp method (CNAP™) offers the ability to measure PPV continuously (PPVCNAP). However, the accuracy regarding the prediction of FR in the operating room has to be proved. METHODS: We compared PPVCNAP with an invasive approach measuring PPV using the PiCCO technology (PPVPiCCO)...
January 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/28028716/evaluation-of-the-health-status-of-six-volunteers-from-the-mars-500-project-using-pulse-analysis
#7
Hong-Zhi Shi, Quan-Chun Fan, Jian-Yi Gao, Jun-Lian Liu, Gui-E Bai, Tao Mi, Shuang Zhao, Yu Liu, Dong Xu, Zhi-Feng Guo, Yong-Zhi Li
OBJECTIVE: To comprehensively evaluate the health status of 6 volunteers from the Mars 500 Project through analyzing their pulse graphs and determining the changes in cardiovascular function, degree of fatigue and autonomic nervous function. METHODS: Six volunteers were recruited; all were male aged 26-38 years (average 31.83±4.96 years). Characteristic parameters reflflecting the status of cardiovascular functions were extracted, which included left ventricular contraction, vascular elasticity and peripheral resistance...
December 27, 2016: Chinese Journal of Integrative Medicine
https://www.readbyqxmd.com/read/28004730/arterial-waveform-parameters-in-a-large-population-based-sample-of-adults-relationships-with-ethnicity-and-lifestyle-factors
#8
J D Sluyter, A D Hughes, S A McG Thom, A Lowe, C A Camargo, B Hametner, S Wassertheurer, K H Parker, R K R Scragg
Little is known about how aortic waveform parameters vary with ethnicity and lifestyle factors. We investigated these issues in a large, population-based sample. We carried out a cross-sectional analysis of 4798 men and women, aged 50-84 years from Auckland, New Zealand. Participants were 3961 European, 321 Pacific, 266 Maori and 250 South Asian people. We assessed modifiable lifestyle factors via questionnaires, and measured body mass index (BMI) and brachial blood pressure (BP). Suprasystolic oscillometry was used to derive aortic pressure, from which several haemodynamic parameters were calculated...
December 22, 2016: Journal of Human Hypertension
https://www.readbyqxmd.com/read/28003205/incorporating-freeze-dried-strawberry-powder-into-a-high-fat-meal-does-not-alter-postprandial-vascular-function-or-blood-markers-of-cardiovascular-disease-risk-a-randomized-controlled-trial
#9
Chesney K Richter, Ann C Skulas-Ray, Trent L Gaugler, Joshua D Lambert, David N Proctor, Penny M Kris-Etherton
BACKGROUND: Postprandial dysmetabolism-an exaggerated spike in triglycerides, glucose, and insulin-increases cardiovascular disease risk by inducing oxidative stress, inflammation, and endothelial dysfunction. Polyphenol-rich foods may blunt these effects when they are incorporated into a high-fat, calorie-dense meal. Strawberries are a rich source of polyphenols, but there is little research on their postprandial effects. OBJECTIVE: This study was designed to investigate the effect of adding 40 g freeze-dried strawberry powder (∼1 lb...
December 21, 2016: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28002069/assessment-of-a-smartphone-app-capstesia-for-measuring-pulse-pressure-variation-agreement-between-two-methods-a-cross-sectional-study
#10
Borja Barrachina, Raquel Cobos, Noemi Mardones, Angel Castañeda, Cristina Vinuesa
BACKGROUND: Less invasive and noninvasive methods are emerging for haemodynamic monitoring. Among them is Capstesia, a smartphone app that, from photographs of a patient monitor showing invasive arterial pressure, estimates advanced haemodynamic variables after digitising and analysing the pressure curves. OBJECTIVE: The aim of this study was to compare the level of agreement between the analysis of the signals obtained from the patient monitor and a photograph of the same images using the Capstesia app...
February 2017: European Journal of Anaesthesiology
https://www.readbyqxmd.com/read/28001078/effect-of-ablation-rate-on-the-microstructure-and-electrochromic-properties-of-pulsed-laser-deposited-molybdenum-oxide-thin-films
#11
S Santhosh, M Mathankumar, S Selva Chandrasekaran, A K Nanda Kumar, P Murugan, B Subramanian
Molybdenum trioxide (MoO3) is a well-known electrochromic material. In the present work, n-type α-MoO3 thin films with both direct and indirect band gaps were fabricated by varying the laser repetition (ablation) rate in a pulsed laser deposition (PLD) system at a constant reactive O2 pressure. The electrochromic properties of the films are compared and correlated to the microstructure and molecular-level coordination. Mixed amorphous and textured crystallites evolve at the microstructural level. At the molecular level, using NMR and EPR, we show that the change in the repetition rate results in a variation of the molybdenum coordination with oxygen: at low repetition rates (2 Hz), the larger the octahedral coordination, and greater the texture, whereas at 10 Hz, tetrahedral coordination is significant...
December 21, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27984249/predicting-fluid-responsiveness-in-acute-liver-failure-a-prospective-study
#12
Vinod Kumar Audimoolam, Mark J W McPhail, Chris Willars, William Bernal, Julia A Wendon, Maurizio Cecconi, Georg Auzinger
BACKGROUND: The profound hemodynamic changes seen in acute liver failure (ALF) resemble the hyperdynamic state found in the later stages of septic shock. Vasopressor support frequently is required after initial volume therapy. Markers of preload dependency have not been studied in this patient group. Dynamic maneuvers such as passive leg raising or end-expiratory hold, which have shown good predictive accuracy in a general intensive care unit population, cannot be considered safe in this cohort because of the concerns of intracranial hypertension...
February 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/27943622/uncertainty-quantification-of-inflow-boundary-condition-and-proximal-arterial-stiffness-coupled-effect-on-pulse-wave-propagation-in-a-vascular-network
#13
Antoine Brault, Laurent Dumas, Didier Lucor
This work aims at quantifying the effect of inherent uncertainties from cardiac output on the sensitivity of a human compliant arterial network response based on stochastic simulations of a reduced-order pulse wave propagation model. A simple pulsatile output form is utilized to reproduce the most relevant cardiac features with a minimum number of parameters associated with left ventricle dynamics. Another source of significant uncertainty is the spatial heterogeneity of the aortic compliance which plays a key role in the propagation and damping of pulse waves generated at each cardiac cycle...
December 10, 2016: International Journal for Numerical Methods in Biomedical Engineering
https://www.readbyqxmd.com/read/27928454/the-role-of-oral-sodium-bicarbonate-supplementation-in-maintaining-acid-base-balance-and-its-influence-on-the-cardiovascular-system-in-chronic-hemodialysis-patients-results-of-a-prospective-study
#14
Voiculeț C, Zară O, Bogeanu C, Văcăroiu I, Aron G
Background: Major acid-base variations during dialysis and the imbalances in serum calcium levels intensified by them play a role in cardiovascular damage of hemodialysis patients. Early vascular walls modifications can be objectified by determining the pulse wave velocity (PWV) - a marker of vascular stiffness that is associated with increased risk of cardiovascular events. Material and methods: This was a prospective study conducted on 63 chronic hemodialysis patients with diuresis above 500 mL/ 24 hours and predialysis blood pressure below 160 mmHg (treatment controlled) randomized in two groups for 12 months - the study group receiving interdialitic oral sodium bicarbonate doses and control group, without oral sodium bicarbonate supplementation, but receiving higher bicarbonate prescriptions in dialysis...
October 2016: Journal of Medicine and Life
https://www.readbyqxmd.com/read/27922879/the-changes-in-pulse-pressure-variation-or-stroke-volume-variation-after-a-tidal-volume-challenge-reliably-predict-fluid-responsiveness-during-low-tidal-volume-ventilation
#15
Sheila Nainan Myatra, Natesh R Prabu, Jigeeshu Vasishtha Divatia, Xavier Monnet, Atul Prabhakar Kulkarni, Jean-Louis Teboul
OBJECTIVES: Stroke volume variation and pulse pressure variation do not reliably predict fluid responsiveness during low tidal volume ventilation. We hypothesized that with transient increase in tidal volume from 6 to 8 mL/kg predicted body weight, that is, "tidal volume challenge," the changes in pulse pressure variation and stroke volume variation will predict fluid responsiveness. DESIGN: Prospective, single-arm study. SETTING: Medical-surgical ICU in a university hospital...
December 5, 2016: Critical Care Medicine
https://www.readbyqxmd.com/read/27922547/changes-in-stroke-volume-induced-by-lung-recruitment-maneuver-predict-fluid-responsiveness-in-mechanically-ventilated-patients-in-the-operating-room
#16
Matthieu Biais, Romain Lanchon, Musa Sesay, Lisa Le Gall, Bruno Pereira, Emmanuel Futier, Karine Nouette-Gaulain
BACKGROUND: Lung recruitment maneuver induces a decrease in stroke volume, which is more pronounced in hypovolemic patients. The authors hypothesized that the magnitude of stroke volume reduction through lung recruitment maneuver could predict preload responsiveness. METHODS: Twenty-eight mechanically ventilated patients with low tidal volume during general anesthesia were included. Heart rate, mean arterial pressure, stroke volume, and pulse pressure variations were recorded before lung recruitment maneuver (application of continuous positive airway pressure of 30 cm H2O for 30 s), during lung recruitment maneuver when stroke volume reached its minimal value, and before and after volume expansion (250 ml saline, 0...
February 2017: Anesthesiology
https://www.readbyqxmd.com/read/27906705/arterial-pressure-variation-in-elective-noncardiac-surgery-identifying-reference-distributions-and-modifying-factors
#17
Michael R Mathis, Samuel A Schechtman, Milo C Engoren, Amy M Shanks, Aleda Thompson, Sachin Kheterpal, Kevin K Tremper
BACKGROUND: Assessment of need for intravascular volume resuscitation remains challenging for anesthesiologists. Dynamic waveform indices, including systolic and pulse pressure variation, are demonstrated as reliable measures of fluid responsiveness for mechanically ventilated patients. Despite widespread use, real-world reference distributions for systolic and pulse pressure variation values have not been established for euvolemic intraoperative patients. The authors sought to establish systolic and pulse pressure variation reference distributions and assess the impact of modifying factors...
February 2017: Anesthesiology
https://www.readbyqxmd.com/read/27865190/effect-of-potassium-supplementation-on-vascular-function-a-meta-analysis-of-randomized-controlled-trials
#18
Xixiang Tang, Bingyuan Wu, Yanting Luo, Long Peng, Yanming Chen, Jieming Zhu, Chaoquan Peng, Suhua Li, Jinlai Liu
BACKGROUND: Effects of potassium supplementation on vascular function remain conflicting. This meta-analysis aimed to summarized current literature to fill the gaps in knowledge. METHODS: A literature search was performed on PubMed database through April, 2016. The measurements of vascular function included pulse wave velocity (PWV), augmentation index (AI), pulse pressure (PP), flow mediated dilatation (FMD), glycerol trinitrate responses (GTN), and intercellular cell adhesion molecule-1 (ICAM-1)...
February 1, 2017: International Journal of Cardiology
https://www.readbyqxmd.com/read/27860389/efficacy-and-safety-of-two-dosages-of-canrenone-as-add-on-therapy-in-hypertensive-patients-taking-ace-inhibitors-or-angiotensin-ii-receptor-blockers-and-hydrochlorothiazide-at-maximum-dosage-in-a-randomized-clinical-trial-the-escape-it-trial
#19
Giuseppe Derosa, Pamela Maffioli, Maria D'Avino, Carla Sala, Amedeo Mugellini, Vito Vulpis, Salvatore Felis, Luigina Guasti, Riccardo Sarzani, Alessandro Bestetti, Massimo Vanasia, Giovanni Gaudio
AIM: To evaluate the effects of canrenone as add-on therapy in patients already treated with angiotensin-converting enzyme inhibitors (ACE-I) or angiotensin II receptor blockers (ARBs) and hydrochlorothiazide at the maximum dosage (25 mg/d). METHOD: In this randomized, open-label, controlled trial, we enrolled 175 Caucasian patients with essential hypertension not well controlled by concomitant ACE-I or ARBs and hydrochlorothiazide. At baseline, 87 patients (57 males and 30 females) were randomized to add canrenone 50 mg, and 88 (56 males and 32 females) patients to canrenone 100 mg, once a day, for 3 months...
February 2017: Cardiovascular Therapeutics
https://www.readbyqxmd.com/read/27858374/prediction-of-fluid-responsiveness-an-update
#20
REVIEW
Xavier Monnet, Paul E Marik, Jean-Louis Teboul
In patients with acute circulatory failure, the decision to give fluids or not should not be taken lightly. The risk of overzealous fluid administration has been clearly established. Moreover, volume expansion does not always increase cardiac output as one expects. Thus, after the very initial phase and/or if fluid losses are not obvious, predicting fluid responsiveness should be the first step of fluid strategy. For this purpose, the central venous pressure as well as other "static" markers of preload has been used for decades, but they are not reliable...
December 2016: Annals of Intensive Care
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