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https://www.readbyqxmd.com/read/28372065/end-correction-model-for-the-transfer-impedance-of-microperforated-panels-using-viscothermal-wave-theory
#1
Xianhui Li
Microperforated panels (MPPs) are efficient sound absorbers featuring microperforations with low porosity. Sound absorption occurs inside the perforations and their vicinity as well, which is represented with an end correction in the transfer impedance of the MPPs. Many empirical models for the end correction were derived from experiment or numerical simulation data. In order to validate these models, this paper presents an analytical solution of the end correction for sharp-edged circular perforations using viscothermal wave theory...
March 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28362376/a-comparative-study-of-drug-delivery-methods-targeted-to-the-mouse-inner-ear-bullostomy-versus-transtympanic-injection
#2
Silvia Murillo-Cuesta, Néstor Vallecillo, Rafael Cediel, Adelaida M Celaya, Luis Lassaletta, Isabel Varela-Nieto, Julio Contreras
We present two minimally invasive microsurgical techniques in rodents for specific drug delivery into the middle ear so that it may reach the inner ear. The first procedure consists of perforation of the tympanic bulla, termed bullostomy; the second one is a transtympanic injection. Both emulate human clinical intratympanic procedures. Chitosan-glycerophosphate (CGP) and Ringer´s Lactate buffer (RL) were used as biocompatible vehicles for local drug delivery. CGP is a nontoxic biodegradable polymer widely used in pharmaceutical applications...
March 8, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28281999/the-hidden-story-of-innovation-charity-hospital-angola-prison-and-the-challenging-of-surgical-dogma
#3
Patrick Greiffenstein, Paul R Hastings
The late 1960s was a period of significant upheaval of social, cultural, and scientific norms. The generally accepted notion of mandatory laparotomy for all penetrating abdominal injuries was among those norms being called into question across the country and many advocated expectant management of selected patients presenting with this type of injury. Leaders of the surgical community published opinions on either side of the argument. The house staff at Charity Hospital during this period was among the busiest in the nation in treating these injuries, many of them inmates of the Louisiana State Penitentiary who used self-inflicted stab wounds to the abdomen as a means of temporary respite from the inhumane conditions in the prison...
February 1, 2017: American Surgeon
https://www.readbyqxmd.com/read/28240239/hybrid-acoustic-metamaterial-as-super-absorber-for-broadband-low-frequency-sound
#4
Yufan Tang, Shuwei Ren, Han Meng, Fengxian Xin, Lixi Huang, Tianning Chen, Chuanzeng Zhang, Tian Jain Lu
A hybrid acoustic metamaterial is proposed as a new class of sound absorber, which exhibits superior broadband low-frequency sound absorption as well as excellent mechanical stiffness/strength. Based on the honeycomb-corrugation hybrid core (H-C hybrid core), we introduce perforations on both top facesheet and corrugation, forming perforated honeycomb-corrugation hybrid (PHCH) to gain super broadband low-frequency sound absorption. Applying the theory of micro-perforated panel (MPP), we establish a theoretical method to calculate the sound absorption coefficient of this new kind of metamaterial...
February 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28228196/the-hidden-story-of-innovation-charity-hospital-angola-prison-and-the-challenging-of-surgical-dogma
#5
Patrick Greiffenstein, Paul R Hastings
The late 1960s was a period of significant upheaval of social, cultural, and scientific norms. The generally accepted notion of mandatory laparotomy for all penetrating abdominal injuries was among those norms being called into question across the country and many advocated expectant management of selected patients presenting with this type of injury. Leaders of the surgical community published opinions on either side of the argument. The house staff at Charity Hospital during this period was among the busiest in the nation in treating these injuries, many of them inmates of the Louisiana State Penitentiary who used self-inflicted stab wounds to the abdomen as a means of temporary respite from the inhumane conditions in the prison...
February 1, 2017: American Surgeon
https://www.readbyqxmd.com/read/27890104/an-autopsy-case-of-spontaneous-esophageal-perforation-boerhaave-syndrome
#6
Kaori Kimura-Kataoka, Junko Fujihara, Satsuki Kurata, Yoshikazu Takinami, Ken Inoue, Toshihiro Yasuda, Haruo Takeshita
A 45-year-old male, an alcohol addict with asthma, was found dead in his home, after several days of continued drinking. A forensic autopsy was performed 3days after the discovery of his death in order to specify the cause of death. A longitudinal perforation penetrating all layers of the esophagus measuring 1.8cm was present on the left wall approximately 2.0cm from the gastroesophageal junction. There were 1900mL of greenish to brownish turbid liquid in the left pleural cavity and 150mL of greenish viscous liquid in the stomach...
November 2016: Legal Medicine
https://www.readbyqxmd.com/read/27771601/r-gas-under-diaphragm
#7
Maddibande Ramachar Sreevathsa, Khyati Melanta
INTRODUCTION: The most common cause of gas under diaphragm is hollow viscous perforation. In 10% of cases it can be due to rare causes, both abdominal and extra-abdominal, one of them being intra abdominal infection by gas forming organisms. PRESENTATION OF THE CASE: A 51 year old male patient, a poorly controlled diabetic, presented with a second episode of severe pain abdomen and abdominal distention, with lower abdominal tenderness. Plain Xray of the abdomen in erect posture showed gas under the right dome of diaphragm and ultrasound abdomen confirmed gross pneumoperitoneum...
2016: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/27666540/management-of-gastrointestinal-perforation-from-blunt-and-penetrating-abdominal-trauma-in-children-analysis-of-96-patients
#8
Serkan Arslan, Mehmet Hanifi Okur, Mehmet Serif Arslan, Bahattin Aydogdu, Hikmet Zeytun, Erol Basuguy, Mustafa Icer, Cemil Goya
AIM: The objective of the present study was to evaluate the diagnostic methods, concomitant organ injuries, factors affecting mortality and morbidity, treatment methods, and outcomes of patients treated for traumatic gastrointestinal (GI) perforation. MATERIALS AND METHODS: We conducted a retrospective review of the medical records of 96 patients who had been treated for GI perforation between January 2000 and October 2015. Data were collected and organised according to the following categories: general patient information, age, gender, hospitalisation period, trauma mechanisms, concomitant injuries, radiological assessment, diagnosis and treatment methods, treatment forms, and complications...
November 2016: Pediatric Surgery International
https://www.readbyqxmd.com/read/26487225/hybridknife-high-pressure-glycerol-jet-injection-for-endoscopic-submucosal-dissection-increases-procedural-ease-and-speed-a-randomised-study-in-pigs-and-a-human-case-series
#9
Jérémie Jacques, Sebastien Kerever, Paul Carrier, Claude-Yves Couquet, Maryline Debette-Gratien, Tessa Tabouret, Hugo Lepetit, Sophie Geyl, Veronique Loustaud-Ratti, Denis Sautereau, Romain Legros
BACKGROUND AND AIMS: Good use of the submucosal space is key during endoscopic submucosal dissection (ESD). High-pressure injection of a long-lasting viscous solution using the HybridKnife water-jet system has been demonstrated to be feasible. We compared jet injection of glycerol and normal saline during pig gastric ESD and assessed its feasibility and efficiency during human ESD. MATERIALS AND METHODS: A blinded randomised controlled study of ESD with the HybridKnife injecting either a glycerol mixture or normal saline and a prospective human case series were performed...
July 2016: Surgical Endoscopy
https://www.readbyqxmd.com/read/26356488/high-pressure-jet-injection-of-viscous-solutions-for-endoscopic-submucosal-dissection-esd-first-clinical-experience
#10
Mathieu Pioche, Vincent Lépilliez, Pierre Déprez, Marc Giovannini, Fabrice Caillol, Hubert Piessevaux, Jérôme Rivory, Olivier Guillaud, Mihai Ciocîrlan, Damien Salmon, Isabelle Lienhart, Cyril Lafon, Jean-Christophe Saurin, Thierry Ponchon
BACKGROUND: Long lasting elevation is a key factor during endoscopic submucosal dissection (ESD) and can be obtained by water jet injection of saline solution or by viscous macromolecular solutions. In a previous animal study, we assessed the Nestis Enki II system to combine jet injection and viscous solutions. In the present work, we used this combination in humans in different sites of the digestive tract. METHODS: We retrospectively report all of the consecutive ESD procedures performed with jet injection of viscous solutions in four centers...
August 2015: Endoscopy International Open
https://www.readbyqxmd.com/read/26066181/lattice-boltzmann-investigation-of-droplet-inertial-spreading-on-various-porous-surfaces
#11
Xavier Frank, Patrick Perré, Huai-Zhi Li
The spreading of liquid drops on solid surfaces is a wide-spread phenomenon of both fundamental and industrial interest. In many applications, surfaces are porous and spreading patterns are very complex with respect to the case on smooth surfaces. Focusing on the inertial spreading just before the Tanner-like viscous regime, this work investigates the spreading of a low-viscosity droplet on a porous surface using lattice Boltzmann numerical simulations. The case of a flat surface is first considered, and it reveals a dependence on the solid equilibrium contact angle θ(s)(eq), which is in good agreement with published experimental data...
May 2015: Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
https://www.readbyqxmd.com/read/25926397/abdominal-distension-and-escherichia-coli-peritonitis-in-mice-lacking-myeloid-differentiation-factor-88
#12
Linda K Johnson, Antin Yn Widi, Serrin Rowarth, Alan G Baxter
Here we describe the gross and microscopic findings of naturally occurring, β-hemolytic Escherichia coli peritonitis in B6.129-Myd88(tm1Aki) male and female mice. Over approximately 5 mo, 10 homozygous mutant mice deficient in myeloid differentiation factor 88 (C57BL/6 strain; male and female) that had not been used in research protocols developed rapid-onset abdominal swelling associated with copious viscous ascites. Each mouse developed an anterior peritonitis, primarily involving the parietal peritoneum and the visceral surface of the spleen, liver, diaphragm, and stomach...
April 2015: Comparative Medicine
https://www.readbyqxmd.com/read/25920830/acoustical-properties-of-air-saturated-porous-material-with-periodically-distributed-dead-end-pores
#13
P Leclaire, O Umnova, T Dupont, R Panneton
A theoretical and numerical study of the sound propagation in air-saturated porous media with straight main pores bearing lateral cavities (dead-ends) is presented. The lateral cavities are located at "nodes" periodically spaced along each main pore. The effect of periodicity in the distribution of the lateral cavities is studied, and the low frequency limit valid for the closely spaced dead-ends is considered separately. It is shown that the absorption coefficient and transmission loss are influenced by the viscous and thermal losses in the main pores as well as their perforation rate...
April 2015: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/25846517/purging-using-the-heimlich-maneuver-among-children-and-adolescents-with-eating-disorders
#14
Ahmed Boachie, Edigna Kusi Appiah, Michelle Jubin, Karin Jasper
This case report describes five independent cases of children and adolescents assessed for eating disorders who disclosed using the Heimlich maneuver as a purging technique. The maneuver is meant to be used only in life or death situations, likely once or less in any person's lifetime. A child or adolescent with an eating disorder may be using it to self-induce vomiting on a daily basis, increasing the risk of complications, including potential damage to major organs of the body. Asking patients who purge to elaborate on the methods with which they purge can provide clinicians with fuller information, improving their ability to select appropriate medical tests and interventions...
September 2015: International Journal of Eating Disorders
https://www.readbyqxmd.com/read/25631107/high-pressure-injection-of-glycerol-with-hybridknife-for-esd-is-feasible-and-increases-the-ease-and-speed-of-the-procedure-an-in-vivo-study-in-pigs-and-first-use-in-human
#15
Jérémie Jacques, Denis Sautereau, Paul Carrier, Claude-Yves Couquet, Maryline Debette-Gratien, Anne Le-Sidaner, Tessa Tabouret, Virginie Valgueblasse, Veronique Loustaud-Ratti, Romain Legros
BACKGROUND AND AIMS: The HybridKnife water-jet system (ERBE, Tubingen, Germany) has been shown to increase dissection speed and decreased the risk of perforation during endoscopic submucosal dissection (ESD). Glycerol mixture is a viscous, long-lasting solution preferentially used by Japanese ESD experts. The combination of the HybridKnife system with a glycerol solution has not been evaluated to date. MATERIALS AND METHODS: A prospective non-randomised comparative study of ESD with HybridKnife injecting of either a glycerol mixture or normal saline was performed...
November 2015: Surgical Endoscopy
https://www.readbyqxmd.com/read/25603306/recurring-spontaneous-aseptic-pneumoperitoneum-presenting-secondary-to-an-unrelated-chief-complaint-a-case-report
#16
Mohammad Alassaf
INTRODUCTION: Pneumoperitoneum, observed by radiography, is typically associated with the perforation of hollow viscous. More than 90% of all cases of pneumoperitoneum are the result of a gastrointestinal tract perforation. These patients usually present with signs of acute peritonitis and require immediate surgical exploration and intervention. However, rare cases of idiopathic spontaneous pneumoperitoneum do occur without any indication of visceral perforation and other known causes of the free intraperitoneal gas...
2015: International Journal of Surgery Case Reports
https://www.readbyqxmd.com/read/25316651/a-clinical-and-radiographic-case-series-of-implants-placed-with-the-simplified-minimally-invasive-antral-membrane-elevation-technique-in-the-posterior-maxilla
#17
Udatta Kher, Andreas L Ioannou, Tarun Kumar, Kostantinos Siormpas, Miltiades E Mitsias, Ziv Mazor, Georgios A Kotsakis
The aim of the present case series was to evaluate a simplified minimally invasive transalveolar sinus elevation technique utilizing calcium phosphosilicate (CPS) putty for hydraulic sinus membrane elevation. The simplified minimally invasive antral membrane elevation technique is based on the application of hydraulic pressure via a viscous bone graft that acts as an incompressible fluid. In this retrospective study, 21 patients (mean age: 48.5 ± 12 years) consecutively treated with the simplified minimally invasive transalveolar sinus elevation technique were evaluated...
December 2014: Journal of Cranio-maxillo-facial Surgery
https://www.readbyqxmd.com/read/25250279/comparison-of-percutaneous-versus-open-surgical-techniques-for-placement-of-peritoneal-dialysis-catheter-in-children-a-randomized-clinical-trial
#18
Alireza Merrikhi, Hojatollah Raji Asadabadi, Ali Akbar Beigi, Sayed Mahdi Marashi, Hafez Ghaheri, Zohre Nasiri Zarch
UNLABELLED: Background This research compares the outcomes of percutaneous technique and open surgical peritoneal dialysis catheter placement in children. METHODS: In this randomized controlled trial, between 2010 and 2011,a total of 35 pediatric uremic patients were enrolled and randomized into two study groups. Follow up data included duration of operation (minute), duration of hospitalization (days) and onset time of peritoneal dialysis. Complications were considered as mechanical and infectious...
2014: Medical Journal of the Islamic Republic of Iran
https://www.readbyqxmd.com/read/25240916/multi-institutional-experience-with-penetrating-pancreatic-injuries-in-children
#19
MULTICENTER STUDY
Hanna Alemayehu, Kuojen Tsao, Mark L Wulkan, Saleem Islam, Robert T Russell, Todd A Ponsky, Daniel C Cullinane, Adam Alder, Shawn D St Peter, Corey W Iqbal
PURPOSE: Penetrating pancreatic injuries in children are uncommon and are not well described in the literature. We report a multi-institutional experience with penetrating pancreatic injuries in children. METHODS: A retrospective review of children sustaining penetrating pancreatic injuries was performed at eight pediatric trauma centers. RESULTS: Sixteen patients were identified. Eleven patients were male; (mean ± SE) age was 11.7 ± 1.2 years...
November 2014: Pediatric Surgery International
https://www.readbyqxmd.com/read/25159241/adjunctive-treatment-of-abdominal-catastrophes-and-sepsis-with-direct-peritoneal-resuscitation-indications-for-use-in-acute-care-surgery
#20
RANDOMIZED CONTROLLED TRIAL
Jason W Smith, R Neal Garrison, Paul J Matheson, Brian G Harbrecht, Matthew V Benns, Glen A Franklin, Keith R Miller, Matthew C Bozeman, J David Richardson
BACKGROUND: The success of damage-control surgery (DCS) for the treatment of trauma has led to its use in other surgical problems such as abdominal sepsis. Previous studies using direct peritoneal resuscitation (DPR) for the treatment of trauma have yielded promising results. We present the results of the application of this technique to patients experiencing abdominal sepsis. METHODS: We enrolled 88 DCS patients during a 5 year-period (January 2008 to December 2012) into a propensity-matched study to evaluate the utility of using DPR in addition to standard resuscitation...
September 2014: Journal of Trauma and Acute Care Surgery
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