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https://www.readbyqxmd.com/read/29328287/method-for-precise-evaluation-of-refractive-index-modulation-amplitude-inside-the-volume-bragg-grating-recorded-in-photo-thermo-refractive-glass
#1
Peng Chen, Dongbing He, Yunxia Jin, Junming Chen, Jingyin Zhao, Jiao Xu, Yibin Zhang, Fanyu Kong, Hongbo He
In this paper, we present a method for achieving precise evaluation of amplitude of refractive index modulation (RIM) inside the volume Bragg grating (VBG) recorded in photo-thermo-refractive (PTR) glasses. The Gaussian divergence characteristics of the incident beam is theoretically considered when calculating the angular selectivity of VBG, and the profiles of experimental angular selectivity curves are utilized to determine the value of RIM with one step. The effectiveness of our proposed method is experimentally verified...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29306011/adaptation-of-human-gut-microbiota-to-bariatric-surgeries-in-morbidly-obese-patients-a-systematic-review
#2
Hanieh-Sadat Ejtahed, Pooneh Angoorani, Shirin Hasani-Ranjbar, Seyed-Davar Siadat, Nasrin Ghasemi, Bagher Larijani, Ahmad-Reza Soroush
BACKGROUND: Bariatric surgeries have turned to be a popular therapeutic option for morbid obesity nowadays. Gut microbiota is supposed to be responsible as a part of the bariatric surgeries success. In this systematic review, we detailed the human studies which investigated the effect of different bariatric surgeries on the composition of gut microbiota. METHODS: We did a comprehensive search in PubMed, Web of Science, and Scopus for all clinical trials and longitudinal observational studies documented up to December 2015...
January 3, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29301014/pedicled-vascularized-bone-grafts-for-posterior-occipitocervical-and-cervicothoracic-fusion-a-cadaveric-feasibility-study
#3
Michael A Bohl, Michael A Mooney, Joshua S Catapano, Kaith K Almefty, Jay D Turner, Steve W Chang, Mark C Preul, Edward M Reece, U Kumar Kakarla
BACKGROUND: Arthrodesis is critical for achieving favorable outcomes in reconstructive spine surgery. Vascularized bone grafts (VBGs) have been successfully used to augment fusion rates in a variety of skeletal pathologies, and pedicled VBG has numerous advantages over free transfer VBG. Pedicled VBG has not previously been described for the posterior occipitocervicothoracic spine. OBJECTIVE: To identify, describe, and assess potential donor sites for pedicled VBGs from occiput to T12 using a cadaver model and to describe important technical considerations for graft harvest and placement...
December 30, 2017: Operative Neurosurgery (Hagerstown, Md.)
https://www.readbyqxmd.com/read/29193717/is-venous-blood-gas-performed-in-the-emergency-department-predictive-of-outcome-during-acute-on-chronic-hypercarbic-respiratory-failure
#4
Lisa Domaradzki, Sahithi Gosala, Khaled Iskandarani, Andry Van de Louw
BACKGROUND: during acute on chronic hypercarbic respiratory failure (AHRF), arterial pH is associated with non-invasive ventilation (NIV) failure and mortality. Venous blood gas (VBG) has been proposed as a substitute for arterial blood gas, based on a good agreement between venous and arterial values. We assessed the predictive value of admission VBG on intubation rate, NIV failure and mortality during AHRF. METHODS: retrospective chart review of inpatients admitted between 2009 and 2015 with AHRF who had VBG performed on admission...
November 28, 2017: Clinical Respiratory Journal
https://www.readbyqxmd.com/read/29136384/field-effect-modulation-of-heterogeneous-charge-transfer-kinetics-at-back-gated-2d-mos2-electrodes
#5
Yan Wang, Chang-Hyun Kim, Youngdong Yoo, James E Johns, C Daniel Frisbie
The ability to improve and to modulate the heterogeneous charge transfer kinetics of two dimensional (2D) semiconductors, such as MoS2, is a major challenge for electrochemical and photoelectrochemical applications of these materials. Here we report a continuous and reversible physical method for modulating the heterogeneous charge transfer kinetics at a monolayer MoS2 working electrode supported on a SiO2/p-Si substrate. The heavily doped p-Si substrate serves as a back gate electrode; application of a gate voltage (VBG) to p-Si tunes the electron occupation in the MoS2 conduction band and shifts the conduction band edge position relative to redox species dissolved in electrolyte in contact with the front side of the MoS2...
November 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/29111277/resolution-of-ketoacidosis-in-children-with-new-onset-diabetes-evaluation-of-various-definitions
#6
Julia E von Oettingen, Erinn T Rhodes, Joseph I Wolfsdorf
AIMS: Data are sparse concerning use of serum electrolyte parameters as compared to venous blood gas (VBG) measurements to monitor acid-base status during treatment of diabetic ketoacidosis (DKA). We explored the utility of various parameters to define DKA resolution by investigating the relationship of venous pH (vpH), anion gap (AG), serum bicarbonate (HCO3), and glucose concentration during management of DKA in children with new onset diabetes mellitus (NODM). METHODS: We included all patients with NODM presenting with DKA to Boston Children's Hospital from 10/1/07-7/1/13...
October 27, 2017: Diabetes Research and Clinical Practice
https://www.readbyqxmd.com/read/29101719/revisional-gastric-bypass-for-failed-restrictive-procedures-comparison-of-single-anastomosis-mini-and-roux-en-y-gastric-bypass
#7
Owaid M Almalki, Wei-Jei Lee, Jung-Chien Chen, Kong-Han Ser, Yi-Chih Lee, Shu-Chun Chen
BACKGROUND: Ten to 50% of patients who received restrictive bariatric operations may require reoperation for unsatisfactory weight loss or weight regain. Failed restrictive procedures are usually managed with conversion to another bariatric procedure with a favor of conversion to laparoscopic gastric bypass. Our aim is to evaluate two different bypass techniques, laparoscopic RY gastric bypass (RYGB) versus single-anastomosis (mini-) gastric bypass (SAGB) as a revision option (R-RYGB and R-SAGB) for failed restrictive bariatric operations...
November 3, 2017: Obesity Surgery
https://www.readbyqxmd.com/read/29041632/wavelength-and-oam-tunable-vortex-laser-with-a-reflective-volume-bragg-grating
#8
Qiyao Liu, Yongguang Zhao, Manman Ding, Weichao Yao, Xuliang Fan, Deyuan Shen
Vortex beams carrying orbital angular momentum (OAM) have been recently investigated intensely in optical communication systems, as using OAM mode multiplexing simultaneously with other conventional multiplexing techniques is the key to further expand data capacity. This article demonstrates a wavelength- and OAM-tunable vortex laser at 1.6 µm in an Er:YAG system. For the first time to the best of our knowledge, a reflective volume Bragg grating (VBG) was theoretically and experimentally proved to be an effective OAM-preserving wavelength selector inside the laser cavity...
September 18, 2017: Optics Express
https://www.readbyqxmd.com/read/29041251/continuous-wave-and-passively-q-switched-cryogenic-yb-klu-wo4-2-laser
#9
Petr Navratil, Venkatesan Jambunathan, Samuel Paul David, Fangxin Yue, Josep Maria Serres, Xavier Mateos, Magdalena Aguiló, Francesc Díaz, Uwe Griebner, Valentin Petrov, Antonio Lucianetti, Tomas Mocek
We study cryogenic laser operation of an Yb-doped KLu(WO4)2 crystal pumped with a volume Bragg grating (VBG) stabilized diode laser at 981 nm. In the continuous wave laser regime, a maximum output power of 4.31 W is achieved at 80 K with a slope efficiency of 44.0% with respect to the incident pump power. Using a 85% initial transmission Cr:YAG crystal for passive Q-switching, an average output power of 2.11 W is achieved at 100 K for a repetition rate of 19 kHz. The pulse energy, pulse duration and peak power amount to 111 µJ, 231 ns and 0...
October 16, 2017: Optics Express
https://www.readbyqxmd.com/read/28951466/emergency-department-blood-gas-utilization-and-changes-in-ventilator-settings
#10
Haitham S Al Ashry, Jeremy B Richards, Daniel F Fisher, Jeffrey Sankoff, Todd A Seigel, Lauren B Angotti, Susan R Wilcox
BACKGROUND: Mechanically ventilated patients increasingly spend hours in emergency department beds before ICU admission. This study evaluated the performance of blood gases in mechanically ventilated subjects in the emergency department and subsequent changes to mechanical ventilation settings. METHODS: This was a multi-center, prospective, observational study of subjects ventilated in the emergency department, conducted at 3 academic emergency departments from July 2011 to March 2013...
September 26, 2017: Respiratory Care
https://www.readbyqxmd.com/read/28940603/long-term-stable-vertical-bone-regeneration-after-sinus-floor-elevation-and-simultaneous-implant-placement-with-and-without-grafting
#11
Fernando Verdugo, Agurne Uribarri, Theresia Laksmana, Antonio D'addona
BACKGROUND: Less invasive surgical approaches to regenerate bone intra-sinus and allow long-term functional implant stability are needed. PURPOSE: To evaluate long-term vertical bone regeneration after sinus floor elevation and simultaneous implant placement with and without bone grafting. METHODS: Vertical bone gains (VBG) post-sinus elevation, with and without grafting, were evaluated in thirty individuals presenting an average residual bone height (RBH) of 4...
December 2017: Clinical Implant Dentistry and related Research
https://www.readbyqxmd.com/read/28832203/the-fourth-extensor-compartment-artery-vascularized-bone-graft-of-the-distal-radius-for-cmc-fusion-in-the-treatment-of-carpal-boss-a-case-report
#12
Jorge G Boretto, David Fernandez-Fernandez, Gerardo Gallucci, Pablo De Carli
BACKGROUND: Carpometacarpal joints can be affected by traumatic or degenerative pathology. Although different techniques have been described to treat these conditions, most authors agree that arthrodesis is an effective treatment modality. Vascularized bone grafts of the distal radius have been used to treat carpal conditions, such as scaphoid nonunion or Kiënbock disease, and they have been shown to have several advantages over nonvascularized bone grafts. METHODS: We report a case of a carpal boss in a female patient treated with an arthrodesis of the second and third carpometacarpal joints by using the fourth extensor compartment artery vascularized bone graft...
September 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28807726/the-value-of-venous-blood-gas-analysis-in-the-diagnosis-of-diabetic-ketoacidosis
#13
Jawad Ibrahim Rasheed, Manal Khudder Abdul Razak, Ahmed Amer Abdul Hussein
BACKGROUND & AIM: Newer blood gas analyzers have the ability to report electrolyte values and glucose in addition to pH, so this diagnostic process could be condensed in diagnosing diabetic ketoacidosis (DKA). We aimed to assess the accuracy of the venous blood gas (VBG) analysis with electrolytes for diagnosing DKA. METHODS: This study prospectively identified a convenience sample of (60 patients) presented with DKA and tested their VBG and serum electrolytes. The diagnosis of DKA was made according to American Diabetes Association criteria...
June 15, 2017: Diabetes & Metabolic Syndrome
https://www.readbyqxmd.com/read/28766267/iodine-status-after-bariatric-surgery-a-prospective-10-year-report-from-the-swedish-obese-subjects-sos-study
#14
Sofia Manousou, Lena M S Carlsson, Robert Eggertsen, Lena Hulthén, Peter Jacobson, Kerstin Landin-Wilhelmsen, Penelope Trimpou, Per-Arne Svensson, Helena Filipsson Nyström
CONTEXT: Bariatric surgery can lead to nutrient deficiencies. Gastric by-pass (GBP) entails restriction and malabsorption, whereas, vertical banded gastroplasty (VBG) is only restrictive. OBJECTIVE: The objective of this study is to study whether GBP-patients develop iodine deficiency from malabsorption, and if GBP- and VBG-patients develop lower 24-h urinary iodine excretion (24-UIE) than obese non-operated controls (OB-controls) due to lower iodine intake. DESIGN: The Swedish Obese Subjects (SOS) study is a prospective, non-randomized study of 4047 obese patients included 1987-2001, who chose bariatric surgery or non-surgical treatment...
August 2, 2017: Obesity Surgery
https://www.readbyqxmd.com/read/28725510/a-critical-appraisal-of-vascularized-bone-grafting-for-scaphoid-nonunion
#15
Ram K Alluri, Christine Yin, Matthew L Iorio, Hyuma Leland, Wendy J Mack, Ketan Patel
Background  Vascularized bone grafting (VBG) has the potential to yield reliable results in scaphoid nonunion; however, results across studies have been highly variable. This study critically evaluates surgical techniques, fracture location, and patient selection in relation to radiographic, clinical, and patient-centered outcomes after VBG for scaphoid nonunion. Methods  We conducted a systematic review of the literature for the use of VBG in scaphoid nonunion. Physical examination, radiographic, and patient-centered outcomes were assessed...
August 2017: Journal of Wrist Surgery
https://www.readbyqxmd.com/read/28647410/reoperative-bariatric-surgery-for-treatment-of-type-2-diabetes-mellitus
#16
Jingliang Yan, Ricardo Cohen, Ali Aminian
Primary bariatric surgery has been proven to be effective in weight loss and improvement of weight-related metabolic co-morbidities. However, a small proportion of patients after bariatric surgery either have persistent hyperglycemia or relapse after initial remission of their metabolic disease. Revisional bariatric surgery has been evaluated extensively for weight recidivism and postoperative complications. However, there has not been any high-level evidence validating the utility of revisional bariatric surgery on recurrent metabolic diseases, especially diabetes...
April 25, 2017: Surgery for Obesity and related Diseases: Official Journal of the American Society for Bariatric Surgery
https://www.readbyqxmd.com/read/28592312/vertical-bone-regeneration-using-rhbmp-2-and-vegf
#17
Lara Schorn, Christoph Sproll, Michelle Ommerborn, Christian Naujoks, Norbert R Kübler, Rita Depprich
BACKGROUND: Sufficient vertical and lateral bone supply and a competent osteogenic healing process are prerequisities for the successful osseointegration of dental implants in the alveolar bone. Several techniques including autologous bone grafts and guided bone regeneration are applied to improve quality and quantity of bone at the implantation site. Depending on the amount of lacking bone one- or two-stage procedures are required. Vertical bone augmentation has proven to be a challenge particularly in terms of bone volume stability...
June 7, 2017: Head & Face Medicine
https://www.readbyqxmd.com/read/28571240/monitoring-microcirculatory-blood-flow-during-cardiopulmonary-bypass-in-paediatric-cardiac-surgery-patients-as-a-predictor-for-anaerobic-metabolism
#18
Ramesh Patel, Atul Solanki, Hasmukh Patel, Jignesh Patel, Himani Pandya, Jainam Sharma
INTRODUCTION: Improving tissue oxygenation is one of most important tasks in management of low cardiac output. Central venous oxygen saturation (ScvO2) and lactate are established criteria for monitoring the adequacy of tissue oxygenation. The venous-to-arterial carbon dioxide difference [P(v-a)CO2] is inversely associated with cardiac output. AIM: To study the use of P(v-a)CO2/C(a-v)O2 ratio as a marker of low cardiac output during Cardiopulmonary Bypass (CPB) in paediatric cardiac surgical patients...
April 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28570215/a-comparison-of-revisional-and-primary-bariatric-surgery
#19
COMPARATIVE STUDY
Courtney Fulton, Caroline Sheppard, Daniel Birch, Shazeer Karmali, Christopher de Gara
BACKGROUND: Revisional surgery is an important component of addressing weight regain and complications following primary bariatric surgery. Owing to provincial need and the complexity of this patient population, a specialized multidisciplinary revision clinic was developed. We sought to characterize patients who undergo revision surgery and compare their outcomes with primary bariatric surgery clinic data. METHODS: We completed a retrospective chart review of bariatric revision clinic patients compared with primary bariatric surgery patients from December 2009 to June 2014...
June 2017: Canadian Journal of Surgery. Journal Canadien de Chirurgie
https://www.readbyqxmd.com/read/28569886/enhanced-self-mixing-interferometry-based-on-volume-bragg-gratings-and-laser-diodes-emitting-at-405-nm-wavelengths
#20
Victor Contreras, Juha Toivonen, Horacio Martinez
Self-mixing interferometry (SMI) represents a robust, self-aligned technique for metrology applications. Recently, it has been shown that the detection of the frequency-modulated (FM) signal enhances the conventional SMI signal based on the amplitude modulation. Here, an all-optical, simple and effective alternative approach to detect the FM self-mixing signal is presented. We demonstrate the enhanced self-mixing approach using a laser diode emitting at 405 nm and a volume Bragg grating (VBG) to map frequency to intensity modulations for further optical detection...
June 1, 2017: Optics Letters
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