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https://www.readbyqxmd.com/read/29228086/new-methods-to-study-the-microcirculation
#1
Damiano Rizzoni, Claudia Agabiti Rosei, Carolina De Ciuceis, Francesco Semeraro, Marco Rizzoni, Franco Docchio
Essential hypertension is associated with structural alterations in the microvessels; in particular, an increase in the media thickness to internal lumen ratio of small resistance arteries (MLR) and a reduction in capillary density have been observed. The evaluation of the morphological characteristics of small resistance arteries in humans is challenging. The gold standard method is generally considered to be the measurement by wire or pressure micromyography of MLR of subcutaneous small vessels obtained by local biopsies...
December 7, 2017: American Journal of Hypertension
https://www.readbyqxmd.com/read/29227480/elaborately-programmed-nanowires-fabricated-using-a-tapered-push-pull-nozzle-system
#2
Yong Zhang, Sifeng Mao, Yuma Suzuki, Yumi Tanaka, Masato Kawaguchi, Weifei Zhang, Hulie Zeng, Hizuru Nakajima, Ming Yang, Katsumi Uchiyama
Elaborately programmed silver nanowire arrays can be prepared using a tapered push-pull nozzle system (TPPNS), which is used to directly write micro-nano wires on a substrate via a two-reagent reaction in the diffusion mixing region. The wires could be precisely positioned on the substrate and their width could be freely controlled from the micro to the nano scale, indicating an advance in the methodologies of controlling and fabricating nanowires. The as-prepared silver three-electrode device can serve as a three-electrode sensor...
December 11, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29226770/an-unexpected-image-on-a-chest-radiograph
#3
Dogus Hemsinli, Hasan Mutlu, Gokalp Altun, Zerrin Pulathan, Ahmet C Ozdemir
Introduction Central venous catheterisation is an essential component of patient care in hospital. A forgotten complete guide-wire is a rare complication, although the reported incidence has increased rapidly over the last decade. Case report We report a 72-year-old man with a complete guide-wire inadvertently overlooked during catheter insertion. A central venous catheter had been inserted for total parental nutrition during treatment for pancreatitis. Five years later, the patient was readmitted with a painful lesion on his neck and the sensation of a sharp object under his skin...
November 2017: Scottish Medical Journal
https://www.readbyqxmd.com/read/29226623/distortion-of-kb-estimates-of-endothelin-1-eta-and-etb-receptor-antagonists-in-pulmonary-arteries-possible-role-of-an-endothelin-1-clearance-mechanism
#4
James A Angus, Richard J A Hughes, Christine E Wright
Dual endothelin ETA and ETB receptor antagonists are approved therapy for pulmonary artery hypertension (PAH). We hypothesized that ETB receptor-mediated clearance of endothelin-1 at specific vascular sites may compromise this targeted therapy. Concentration-response curves (CRC) to endothelin-1 or the ETB agonist sarafotoxin S6c were constructed, with endothelin receptor antagonists, in various rat and mouse isolated arteries using wire myography or in rat isolated trachea. In rat small mesenteric arteries, bosentan displaced endothelin-1 CRC competitively indicative of ETA receptor antagonism...
December 2017: Pharmacology Research & Perspectives
https://www.readbyqxmd.com/read/29225745/heated-wire-humidification-circuit-attenuates-the-decrease-of-core-temperature-during-general-anesthesia-in-patients-undergoing-arthroscopic-hip-surgery
#5
Sooyong Park, Seok-Hwa Yoon, Ann Misun Youn, Seung Hyun Song, Ja Gyung Hwang
Background: Intraoperative hypothermia is common in patients undergoing general anesthesia during arthroscopic hip surgery. In the present study, we assessed the effect of heating and humidifying the airway with a heated wire humidification circuit (HHC) to attenuate the decrease of core temperature and prevent hypothermia in patients undergoing arthroscopic hip surgery under general anesthesia. Methods: Fifty-six patients scheduled for arthroscopic hip surgery were randomly assigned to either a control group using a breathing circuit connected with a heat and moisture exchanger (HME) (n = 28) or an HHC group using a heated wire humidification circuit (n = 28)...
December 2017: Korean Journal of Anesthesiology
https://www.readbyqxmd.com/read/29225703/facilitators-and-barriers-to-healthy-eating-in-a-worksite-cafeteria-a-qualitative-study-from-nepal
#6
Archana Shrestha, Prajjwal Pyakurel, Abha Shrestha, Rabin Gautam, Nisha Manandhar, Elizabeth Rhodes, Dipesh Tamrakar, Biraj Man Karmacharya, Vasanti Malik, Josiemer Mattei, Donna Spiegelman
Objective: Worksite interventions can serve as a potential platform for translating existing knowledge of diabetes prevention and facilitate healthy food choices. The study explored perceptions about healthy eating as well as potential facilitators and barriers to healthy eating among employees in a wire manufacturing factory in Nepal. Methods and materials: We conducted a cross-sectional exploratory qualitative study in a wire manufacturing industry in eastern Nepal...
2017: Heart Asia
https://www.readbyqxmd.com/read/29225127/case-report-simultaneous-endovascular-repair-of-a-thoracic-aortic-injury-during-posterior-pedicle-screw-removal
#7
Serena Martin, Richard Lindsay, Robin C Baker
INTRODUCTION: Posterior spinal stabilisation is a technically demanding procedure which is increasing in popularity. Since this increase in popularity, complications, including screws misplacement, are being highlighted. Accuracy rates are higher when imaging modalities are used intra-operatively. Vascular injuries following posterior spinal stabilisation are rare and are usually discovered late on subsequent imaging. Immediate peri-operative compromise is rare, but nonetheless, resultant vascular injuries can be life threatening...
December 7, 2017: Annals of Vascular Surgery
https://www.readbyqxmd.com/read/29224304/-method-for-recording-tension-changes-of-small-pulmonary-artery-and-vein-using-the-isolated-vessel-tension-measurement-system
#8
X T Wu, M D Kuang, X Ouyang, Y Li, M M Yuan, W J Lu, J Wang, Y Q Chen
Objective: To establish a standardized method for isolated pulmonary artery and vein rings with different diameter, pressure and length, which could provide a more scientific method for in vitro study of pulmonary vessel diseases. Methods: Male SD rats were anesthetized, and the right ventricular systolic pressure were measured. Small pulmonary artery and vein rings with 200-400 μm in diameter and 2 mm in length were prepared by dissecting pulmonary arteries and veins. The pulmonary vessel rings were mounted in the organ bath by 2 stainless steel wires with diameter of 40 μm...
December 12, 2017: Chinese Journal of Tuberculosis and Respiratory Diseases
https://www.readbyqxmd.com/read/29223911/pcbs-and-pcdd-fs-in-soil-from-informal-e-waste-recycling-sites-and-open-dumpsites-in-india-levels-congener-profiles-and-health-risk-assessment
#9
Paromita Chakraborty, Sakthivel Selvaraj, Masafumi Nakamura, Balasubramanian Prithiviraj, Alessandra Cincinelli, John J Bang
Growth of informal electronic waste (e-waste) recycling sector is an emerging problem for India. The presence of halogenated compounds in e-wastes may result in the formation of persistent organic pollutants like polychlorinated biphenyls (PCBs), polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) during recycling processes. We therefore investigated PCBs and PCDD/Fs in surface soils explicitly from the informal e-waste recycling sites and nearby open dumpsites of major metropolitan cities from four corners of India, viz...
December 6, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29222132/invasive-assessment-of-the-coronary-microvasculature-the-index-of-microcirculatory-resistance
#10
REVIEW
William F Fearon, Yuhei Kobayashi
Traditionally, invasive coronary physiological assessment has focused on the epicardial coronary artery. More recently, appreciation of the importance of the coronary microvasculature in determining patient outcomes has grown. Several invasive modalities for interrogating microvascular function have been proposed. Angiographic techniques have been limited by their qualitative and subjective nature. Doppler wire-derived coronary flow reserve has been applied in research studies, but its clinical role has been limited by its lack of reproducibility, its lack of a clear normal value, and the fact that it is not specific for the microvasculature but interrogates the entire coronary circulation...
December 2017: Circulation. Cardiovascular Interventions
https://www.readbyqxmd.com/read/29221959/robotically-assisted-percutaneous-coronary-intervention-reasons-for-partial-manual-assistance-or-manual-conversion
#11
Jonathan Harrison, Lawrence Ang, Jesse Naghi, Omid Behnamfar, Ali Pourdjabbar, Mitul P Patel, Ryan R Reeves, Ehtisham Mahmud
BACKGROUND: Robotically-assisted percutaneous coronary intervention (R-PCI) is feasible for simple coronary lesions. OBJECTIVES: To determine the frequency and reasons for partial manual assistance or manual conversion during R-PCI in clinical practice. METHODS: The CorPath 200 System (Corindus, Waltham, MA) enables the operator to sit in a radiation-shielded cockpit and remotely control intracoronary devices including guidewires, balloons, and stents...
November 9, 2017: Cardiovascular Revascularization Medicine: Including Molecular Interventions
https://www.readbyqxmd.com/read/29221922/pediatric-percutaneous-nephrostomy-a-multicenter-experience
#12
Sphoorti Shellikeri, Robert Daulton, Madeleine Sertic, Bairbre Connolly, Mark Hogan, Francis Marshalleck, Anne Marie Cahill
PURPOSE: To analyze technique, outcomes, and complications of a large series of pediatric percutaneous nephrostomy (PCN) procedures performed at 4 tertiary pediatric centers. MATERIALS AND METHODS: Retrospective multicenter study of PCNs performed during an 11-year period. Six hundred seventy-five PCNs were performed on 441 patients (median age: 4 y, range: 1 d-18 y, median weight: 17 kg, range: 0.7-112 kg); 31% were younger than 1 year. The most frequent indications for PCN procedures included hydronephrosis (57%), calculus (14%), and infection (12%)...
December 5, 2017: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/29221391/quantum-interference-in-multi-branched-molecules-the-exact-transfer-matrix-solutions
#13
Yu Jiang
We present a transfer matrix formalism for studying quantum interference in a single molecule electronic system with internal branched structures. Based on the Schrödinger equation with the Bethe ansatz and employing Kirchhoff's rule for quantum wires, we derive a general closed-form expression for the transmission and reflection amplitudes of a two-port quantum network. We show that the transport through a molecule with complex internal structures can be reduced to that of a single two-port scattering unit, which contains all the information of the original composite molecule...
December 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29220151/integration-of-enzymes-in-polyaniline-sensitized-3d-inverse-opal-tio2-architectures-for-light-driven-biocatalysis-and-light-to-current-conversion
#14
Marc Riedel, Fred Lisdat
Inspired by natural photosynthesis, coupling of artificial light-sensitive entities with biocatalysts in a biohybrid format can result in advanced photobioelectronic systems. Herein, we report on the integration of sulfonated polyanilines (PMSA1) and PQQ glucose dehydrogenase (PQQ-GDH) into inverse opal TiO2 (IO-TiO2) electrodes. While PMSA1 introduces sensitivity for visible light into the biohybrid architecture and ensures the efficient wiring between the IO-TiO2 electrode and the biocatalytic entity, PQQ-GDH provides the catalytic activity for the glucose oxidation and therefore feeds the light-driven reaction with electrons for an enhanced light-to-current conversion...
December 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29219474/zero-energy-modes-from-coalescing-andreev-states-in-a-two-dimensional-semiconductor-superconductor-hybrid-platform
#15
H J Suominen, M Kjaergaard, A R Hamilton, J Shabani, C J Palmstrøm, C M Marcus, F Nichele
We investigate zero-bias conductance peaks that arise from coalescing subgap Andreev states, consistent with emerging Majorana zero modes, in hybrid semiconductor-superconductor wires defined in a two-dimensional InAs/Al heterostructure using top-down lithography and gating. The measurements indicate a hard superconducting gap, ballistic tunneling contact, and in-plane critical fields up to 3 T. Top-down lithography allows complex geometries, branched structures, and straightforward scaling to multicomponent devices compared to structures made from assembled nanowires...
October 27, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29219389/mode-matching-for-optical-antennas
#16
Thorsten Feichtner, Silke Christiansen, Bert Hecht
The emission rate of a point dipole can be strongly increased in the presence of a well-designed optical antenna. Yet, optical antenna design is largely based on radio-frequency rules, ignoring, e.g., Ohmic losses and non-negligible field penetration in metals at optical frequencies. Here, we combine reciprocity and Poynting's theorem to derive a set of optical-frequency antenna design rules for benchmarking and optimizing the performance of optical antennas driven by single quantum emitters. Based on these findings a novel plasmonic cavity antenna design is presented exhibiting a considerably improved performance compared to a reference two-wire antenna...
November 24, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29219118/adaptive-quantization-of-local-field-potentials-for-wireless-implants-in-freely-moving-animals-an-open-source-neural-recording-device
#17
Dominique Martinez, Maxime Clement, Belkacem Messaoudi, Damien Gervasoni, Philippe Litaudon, Nathalie Buonviso
OBJECTIVE: Modern neuroscience research asks for electrophysiological recording of local field potentials (LFPs) in moving animals. Wireless transmission has the advantage of removing the wires between the animal and the recording equipment but is hampered by the large amount of data to be sent at a relatively high rate. APPROACH: To reduce transmission bandwidth, we propose an encoder/decoder scheme based on adaptive non-uniform quantization. Our algorithm uses the current transmitted codeword to adapt the quantization intervals to changing statistics in LFP signals...
December 8, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29218742/prevalence-of-foot-disorders-in-captive-sardinian-partridges-alectoris-barbara-barbara-bonnaterre-1790-as-useful-indicators-of-fitness-to-natural-environment
#18
M G Cappai, A Abd El-Wahab, G Arru, M Muzzeddu, W Pinna
Foot health represents an issue in wild avifauna breeding practices. In particular, prevalence of digital ulceration (DU) and foot pad dermatitis (FPD) are valid indicators of welfare in wildlife conservation centres and may be interpreted as to fitness for bird's reintroduction into the wild. This study meant to test the effects of raising practices on foot pad health in captive Sardinian partridges (Alectoris barbara barbara Bonnaterre, 1790) reared for biodiversity conservation, to assess welfare and fitness to reintroduction into nature...
December 8, 2017: Journal of Animal Physiology and Animal Nutrition
https://www.readbyqxmd.com/read/29216921/ultrasonography-guided-reduction-of-pediatric-radial-neck-fractures
#19
Jung Eun Lee, Jung Bong Kim, Eun Seok Choi
BACKGROUND: Treatment of displaced and angulated radial neck fractures in children is controversial and challenging. Numerous studies have been conducted regarding treatment algorithms and surgical techniques that use fluoroscopy. However, ultrasonography (US)-guided reduction of pediatric radial neck fractures has not been reported yet. We aimed to determine the safety and efficacy of US-guided reduction and fixation of radial neck fractures in children. METHODS: Among 28 cases of radial neck fracture from 2014 to 2016, 12 were classified as type III or IV according to the Judet classification...
December 8, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29216858/use-of-a-hydrophilic-coating-wire-reduces-significantly-the-rate-of-central-vein-punctures-and-the-incidence-of-pneumothorax-in-totally-implantable-access-port-tiap-surgery
#20
Georgios Polychronidis, Roland Hennes, Cosima Engerer, Phillip Knebel, Daniel Schultze, Thomas Bruckner, Beat P Müller-Stich, Lars Fischer
No abstract text is available yet for this article.
December 7, 2017: BMC Surgery
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