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https://www.readbyqxmd.com/read/28227447/non-invasive-monitoring-of-pulmonary-artery-pressure-at-the-bedside
#1
M Proenca, F Braun, E Muntane, J Sola, A Adler, M Lemay, J-Ph Thiran, S F Rimoldi, M Proenca, F Braun, E Muntane, J Sola, A Adler, M Lemay, J-Ph Thiran, S F Rimoldi, S F Rimoldi, E Muntane, J Sola, M Lemay, A Adler, J-Ph Thiran, F Braun
Current solutions for the monitoring of pulmonary artery pressure (PAP) in patients suffering from pulmonary hypertension are limited to invasive means. Non-invasive alternatives, such as Doppler echocardiography, are incompatible with continuous monitoring due to their dependency on qualified personnel to perform the measurements. In the present study, a novel non-invasive and unsupervised approach based on the use of electrical impedance tomography (EIT) is presented. The approach was evaluated in three healthy subjects undergoing hypoxia-induced variations in PAP...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28215067/epidemiology-and-natural-history-of-gastro-esophageal-reflux-disease
#2
Edoardo Savarino, Elisa Marabotto, Giorgia Bodini, Gaia Pellegatta, Claudia Coppo, Elisa Giambruno, Matteo Brunacci, Patrizia Zentilin, Vincenzo Savarino
Gastroesophageal reflux disease (GERD) is highly prevalent in Western countries, particularly when considering its most classic symptom, that is heartburn. This symptom is very frequent in the community and ranges from 10% to more than 30%, according to the various population-based studies. This disease is much more represented in Europe and US than in Asiatic countries. It has been shown that GERD prevalence increases in parallel with the remarkable growth of obesity, as this condition is able to favor all the pathogenetic mechanisms leading to it...
February 17, 2017: Minerva Gastroenterologica e Dietologica
https://www.readbyqxmd.com/read/28214352/gastro-oesophageal-reflux-in-patients-with-chronic-rhino-sinusitis-investigated-with-multichannel-impedance-ph-monitoring
#3
(no author information available yet)
INTRODUCTION: The pathophysiology of chronic rhinosinusitis (CRS) is unclear. It has been discussed for decades whether gastro-oesophageal reflux (GOR) may be a contributing factor for some patients. The aim of the present study was to evaluate the level of GOR in an unselected group of patients with CRS using multichannel impedance-pH monitoring. METHODS: Consecutive patients with CRS diagnosed using the EPOS2012 criteria, completed questionnaires on GOR symptoms and were offered 24-h multichannel intraluminal impedance (MII)-pH monitoring...
February 18, 2017: Rhinology
https://www.readbyqxmd.com/read/28193355/a-paper-based-nanomodified-electrochemical-biosensor-for-ethanol-detection-in-beers
#4
Stefano Cinti, Mattia Basso, Danila Moscone, Fabiana Arduini
Herein, we report the first example of a paper-based screen-printed biosensor for the detection of ethanol in beer samples. Common office paper was adopted to fabricate the analytical device. The properties of this paper-based screen-printed electrode (SPE) were investigated by cyclic voltammetry, electrochemical impedance spectroscopy, and scanning electron microscopy, and they were compared with the well-established polyester-based SPEs as well. Paper demonstrated similar properties when compared with polyester, highlighting suitability towards its utilization in sensor development, with the advantages of low cost and simple disposal by incineration...
April 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28191707/mechanisms-underlying-reflux-symptoms-and-dysphagia-in-patients-with-joint-hypermobility-syndrome-with-and-without-postural-tachycardia-syndrome
#5
A Fikree, Q Aziz, D Sifrim
BACKGROUND: The joint hypermobility syndrome (JHS) is a common non-inflammatory connective tissue disorder which frequently co-exists with postural tachycardia syndrome (PoTS), a form of orthostatic intolerance. Gastrointestinal symptoms and dysmotility have been reported in PoTS. Dysphagia and reflux are common symptoms in JHS, yet no studies have examined the physiological mechanism for these, subdivided by PoTS status. METHODS: Thirty patients (28 female, ages: 18-62) with JHS and symptoms of reflux (n=28) ± dysphagia (n=25), underwent high-resolution manometry and 24 hour pH-impedance monitoring after questionnaire-based symptom assessment...
February 12, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28185711/impact-of-gastroesophageal-reflux-and-delayed-gastric-emptying-on-pediatric-lung-transplant-outcomes
#6
Fei Jamie Dy, Dawn Freiberger, Enju Liu, Debra Boyer, Gary Visner, Rachel Rosen
BACKGROUND: Gastroesophageal reflux disease is thought to predispose to adverse lung allograft outcomes. However, little is known about the burden of gastroesophageal reflux (GER) and gastroparesis in pediatric patients. In this study we describe the burden of reflux and gastroparesis in children undergoing lung transplant, and evaluates their impact on allograft survival and rejection incidence. METHODS: This study is a retrospective analysis of pediatric lung transplant recipients who had combined pH and multichannel intraluminal impedance testing (pH-MII) and gastric-emptying scans (GES)...
January 6, 2017: Journal of Heart and Lung Transplantation
https://www.readbyqxmd.com/read/28161707/pathogenesis-of-double-dose-proton-pump-inhibitor-resistant-non-erosive-reflux-disease-and-mechanism-of-reflux-symptoms-and-gastric-acid-secretion-suppressive-effect-in-the-presence-or-absence-of-helicobacter-pylori-infection
#7
Noriyuki Kawami, Nana Takenouchi, Mariko Umezawa, Shintaro Hoshino, Yuriko Hanada, Yoshimasa Hoshikawa, Hirohito Sano, Yoshio Hoshihara, Tsutomu Nomura, Eiji Uchida, Katsuhiko Iwakiri
BACKGROUND: Various mechanisms have been suggested to be responsible for contributing to the occurrence of proton pump inhibitor (PPI)-resistant non-erosive reflux disease (NERD). The aims of this study were to clarify the pathogenesis of PPI-resistant NERD. METHODS: Fifty-three patients with NERD, who had persistent reflux symptoms despite taking double-dose PPI, were included in this study. After excluding eosinophilic esophagitis (EoE) and primary esophageal motility disorder, esophageal impedance-pH monitoring was carried out...
February 4, 2017: Digestion
https://www.readbyqxmd.com/read/28153247/d-mannitol-sensor-based-on-molecularly-imprinted-polymer-on-electrode-modified-with-reduced-graphene-oxide-decorated-with-gold-nanoparticles
#8
Maísa Azevedo Beluomini, José L da Silva, Graziela Cristina Sedenho, Nelson Ramos Stradiotto
An electrochemical sensor for D-mannitol based on molecularly imprinted polymer on electrode modified with reduced graphene oxide decorated with gold nanoparticles was developed in this present work. The sensor was constructed for the first time via the electropolymerization of o-phenylenediamine (o-PD) over a surface containing reduced graphene oxide (RGO) and gold nanoparticles (AuNP) in the presence of D-mannitol molecules. The surface modification with AuNP/RGO-GCE facilitated the charge transfer processes of [Fe(CN)6](3-/4-), which was used as an electrochemical probe...
April 1, 2017: Talanta
https://www.readbyqxmd.com/read/28151867/an-analysis-of-342-patients-with-refractory-gastroesophageal-reflux-disease-symptoms-using-questionnaires-high-resolution-manometry-and-impedance-ph-monitoring
#9
Fei Wang, Ping Li, Guo-Zhong Ji, Lin Miao, Zhining Fan, Sihong You, Xueqin Pan, Xia Chen
Symptoms of refractory gastroesophageal reflux disease (GERD) are commonly encountered in clinical practice. The aim of this study was to analyze the data obtained from questionnaires, high-resolution manometry (HRM), and ambulatory impedance-pH monitoring in patients with persisting GERD symptoms and to explore the possible underlying causes for this clinical presentation. After completing the questionnaires, the selected patients underwent endoscopy, HRM, and ambulatory impedance-pH monitoring. Based on the results of these investigations, we divided the patients into 4 groups: reflux esophagitis (RE), hypersensitive esophagus (HE), functional heartburn (FH), and nonerosive gastroesophageal reflux disease (NERD)...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28150011/-relationship-between-functional-endoscopy-and-impedance-ph-measurement-german-version
#10
F Michel, T Stroh, R Fritsche, P Ahrens
Classic gastroenterological diagnostic tools are proving increasingly insufficient for analyzing the complex causal relationship between extra-esophageal symptoms and presumed pathological reflux activity. Some new methodological approaches, such as functional endoscopy (videopanendoscopy, VPE), are considered to be helpful. However, there are currently no data objectively verifying the usefulness of this method. In a pilot study, a good correlation between the reflux symptom index (RSI) and endoscopic findings was shown...
February 1, 2017: HNO
https://www.readbyqxmd.com/read/28144844/surveillance-in-patients-with-esophageal-atresia-tracheoesophageal-fistula
#11
REVIEW
Arunjot Singh, William Middlesworth, Julie Khlevner
PURPOSE OF REVIEW: Esophageal atresia/tracheoesophageal fistula (EA/TEF) is a congenital aerodigestive anomaly with high survival rates after surgical repair. Care should now be focused on prevention of long-term complications using appropriate surveillance techniques. RECENT FINDINGS: The incidence of gastroesophageal reflux disease (GERD) is high in patients with EA/TEF. Consequences of untreated GERD include esophagitis, strictures, and Barrett esophagus. Subjective symptoms are an unreliable indicator of presence or severity of GERD, and therefore, diagnostic testing is needed to assess esophageal heath and monitor the effectiveness of anti-reflux treatment...
January 2017: Current Gastroenterology Reports
https://www.readbyqxmd.com/read/28142626/photodegradation-performance-and-mechanism-of-4-nonylphenol-by-wo3-tio2-and-tio2-nanotube-array-photoelectrodes
#12
Yanjun Xin, Gang Wang, Xiangwei Zhu, Mengchun Gao, Yongping Liu, Qinghua Chen
TiO2 Nanotube arrays (TNA) and WO3 coated TNA photoelectrodes were fabricated using an in-situ anodization and pulse electrochemical deposition technology. The performance of the TNA photoelectrodes in the photocatalytic (PC) and photoelectrocatalytic (PEC) degradation of 4-nonylphenol (4-NP) were investigated. The effects of the initial pH and the anions on the degradation rates and reaction mechanism of 4-NP were studied by the photoluminescence (PL) spectra and electrochemical impedance spectra (EIS). The degradation of 4-NP was fitted to a first-order reaction, and the apparent kinetic constants were 1...
February 1, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28133854/waist-to-hip-ratio-is-a-better-predictor-of-esophageal-acid-exposure-than-body-mass-index
#13
C Ringhofer, J Lenglinger, M Riegler, I Kristo, A Kainz, S Schoppmann
BACKGROUND: Obesity and gastroesophageal reflux disease (GERD) are major health problems showing an inconstant relationship in the literature. Therefore, anthropometric parameters which are predictive and can simply be assessed at first patient presentation may lead to a better patient selection for ambulatory reflux monitoring. We aimed to examine the association of body mass index (BMI) and waist to hip ratio (WHR) with gastroesophageal reflux activity during 24 hour-pH-impedance monitoring...
January 29, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28117942/the-effect-of-simulated-inflammatory-conditions-and-fenton-chemistry-on-the-electrochemistry-of-cocrmo-alloy
#14
Yangping Liu, Jeremy L Gilbert
Inflamed conditions may develop in total joint replacement applications and may impact on the corrosion of metallic biomaterials like CoCrMo alloy. The influence of simulated inflammatory (SI) conditions on the corrosion behavior of CoCrMo alloy was investigated. A range of SI solutions, based on phosphate buffered saline with H2 O2 , HCl, and Fe(3+) additions, were investigated. Open circuit potential (OCP), corrosion currents and impedance of the oxide film surface were all significantly (p < 0.05) affected by increases in H2 O2 concentration and decrease of pH...
January 24, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/28114076/a-multi-technique-reconfigurable-electrochemical-biosensor-enabling-personal-health-monitoring-in-mobile-devices
#15
Alexander Sun, A G Venkatesh, Drew A Hall
This paper describes the design and characterization of a reconfigurable, multi-technique electrochemical biosensor designed for direct integration into smartphone and wearable technologies to enable remote and accurate personal health monitoring. By repurposing components from one mode to the next, the biosensor's potentiostat is able reconfigure itself into three different measurements modes to perform amperometric, potentiometric, and impedance spectroscopic tests all with minimal redundant devices. A [Formula: see text] PCB prototype of the module was developed with discrete components and tested using Google's Project Ara modular smartphone...
September 26, 2016: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28113176/a-multi-technique-reconfigurable-electrochemical-biosensor-enabling-personal-health-monitoring-in-mobile-devices
#16
Alexander Sun, A G Venkatesh, Drew A Hall
This paper describes the design and characterization of a reconfigurable, multi-technique electrochemical biosensor designed for direct integration into smartphone and wearable technologies to enable remote and accurate personal health monitoring. By repurposing components from one mode to the next, the biosensor's potentiostat is able reconfigure itself into three different measurements modes to perform amperometric, potentiometric, and impedance spectroscopic tests all with minimal redundant devices. A [Formula: see text] PCB prototype of the module was developed with discrete components and tested using Google's Project Ara modular smartphone...
October 2016: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28110538/deciphering-the-effect-of-polymer-assisted-doping-on-the-optoelectronic-properties-of-block-copolymer-anchored-graphene-oxide
#17
Nabasmita Maity, Atanu Kuila, Arun K Nandi
Doping facilitates the tuning of band gap, providing an opportunity to tailor the optoelectronic properties of graphene in a simple way, and polymer-assisted doping is a new route to combine the optoelectronic properties of graphene with the properties of a polymer. In this endeavor, a linear diblock copolymer, polycaprolactone-block-poly(dimethyl aminoethyl methacrylate) (PCL13-b-PDMAEMA117) (GPCLD) is grafted from the graphene oxide (GO) surface via consecutive ring opening and atom transfer radical polymerization...
February 3, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28103044/when-salt-rejecting-polymers-meet-protons-an-electrochemical-impedance-spectroscopy-investigation
#18
Noga Fridman-Bishop, Viatcheslav Freger
Polymeric membranes are widely used for salt removal, but mechanism of ion permeation is still insufficiently understood. Here we analyze ion transport in polymers relevant to desalination, dense aromatic polyamide Nomex and cellulose acetate (CA), using impedance spectroscopy, focusing on the effects of the salt type, concentration and pH. The results highlight the role of proton uptake in ion permeation. For Nomex the exceptionally high affinity to proton results in a power-low scaling of conductivity with salt concentrations with an unusual exponent 1/2...
February 2, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28078818/objectively-diagnosing-rumination-syndrome-in-children-using-esophageal-ph-impedance-and-manometry
#19
M M J Singendonk, J M Oors, A J Bredenoord, T I Omari, R J van der Pol, M J Smits, M A Benninga, M P van Wijk
BACKGROUND: Rumination syndrome is characterized by recurrent regurgitation of recently ingested food into the mouth. Differentiation with other diagnoses and gastroesophageal reflux disease (GERD) in particular, is difficult. Recently, objective pH-impedance (pH-MII) and manometry criteria were proposed for adults. The aim of this study was to determine diagnostic ambulatory pH-MII and manometry criteria for rumination syndrome in children. METHODS: Clinical data and 24-hour pH-MII and manometry recordings of children with a clinical suspicion of rumination syndrome were reviewed...
January 12, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28068288/monitoring-of-breath-vocs-and-electrical-impedance-tomography-under-pulmonary-recruitment-in-mechanically-ventilated-patients
#20
Beate Brock, Svend Kamysek, Josephine Silz, Phillip Trefz, Jochen K Schubert, Wolfram Miekisch
Analysis of exhaled VOCs can provide information on physiology, metabolic processes, oxidative stress and lung diseases. In critically ill patients, VOC analysis may be used to gain complimentary information beyond global clinical parameters. This seems especially attractive in mechanically ventilated patients frequently suffering from impairment of gas exchange. This study was intended to assess (a) the effects of recruitment maneuvers onto VOC profiles, (b) the correlations between electrical impedance tomography (EIT) data and VOC profiles and (c) the effects of recruitment onto distribution of ventilation...
January 9, 2017: Journal of Breath Research
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