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Wall deformity

Bhawna Verma, Tobias Oesterlein, Axel Loewe, Armin Luik, Claus Schmitt, Olaf Dössel
BACKGROUND: During atrial fibrillation, heterogeneities and anisotropies result in a chaotic propagation of the depolarization wavefront. The electrophysiological parameter called conduction velocity (CV) influences the propagation pattern over the atrium. We present a method that determines the regional CV for deformed catheter shapes, which result due to the catheter movement and changing wall contact. METHODS: The algorithm selects stable catheter positions, finds the local activation times (LAT), considers the wall contact and calculates all CV estimates within the area covered by the catheter...
November 26, 2017: Computers in Biology and Medicine
Lixiang Wang, Wei Song, Sisen Zhang
Chest compression cannot be effectively applied under certain situations, such as chest wall deformity, rib fracture, or hemopneumothorax. Active abdominal compression-decompression cardiopulmonary resuscitation (AACD-CPR) could reach better resuscitation outcomes in certain cardiac arrest (CA) patients. AACD-CPR can strengthen the high quality of cardiopulmonary resuscitation (CPR) in "2015 American Heart Association for cardiopulmonary resuscitation and emergency cardiovascular care update guide". The two methods can complement each other in opposite direction, and implement the "2016 national consensus on cardiopulmonary resuscitation on CPR in China", which is an important part of the wisdom to the Chinese CPR...
December 2017: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
Qiyun Qiao, Wanlin Cao, Zhiwei Qian, Xiangyu Li, Wenwen Zhang, Wenchao Liu
In this study, the cyclic behaviors of low rise concrete shear walls using recycled coarse or fine aggregates were investigated. Eight low rise Recycled Aggregates Concrete (RAC) shear wall specimens were designed and tested under a cyclic loading. The following parameters were varied: replacement percentages of recycled coarse or fine aggregates, reinforcement ratio, axial force ratio and X-shaped rebars brace. The failure characteristics, hysteretic behavior, strength and deformation capacity, strain characteristics and stiffness were studied...
December 7, 2017: Materials
Maho Inoue, Shigeyoshi Aoi, Akihiro Taniguchi, Kohei Sakai, Mayumi Higashi, Shigehisa Fumino, Taizo Furukawa, Tatsuro Tajiri
BACKGROUND: The incidence of incisional hernia in pediatric patients is low in comparison with that reported in adults. In the pediatric population, primary closure has generally been favored. However, synthetic or biomedical mesh offers advantages in the repair of larger defects when primary closure is difficult. The use of laparoscopic intraperitoneal onlay mesh (IPOM) in the adult population has been well documented. In the pediatric population, a few laparoscopic approaches with direct suturing have been proposed; however, there are no reports of laparoscopic repair with the use of IPOM...
December 7, 2017: Surgical Case Reports
Christof M Sommer, Thuy D Do, Christopher L Schlett, Paul Flechsig, Theresa L Gockner, Anja Kuthning, Dominik F Vollherbst, Philippe L Pereira, Hans U Kauczor, Stephan Macher-Göppinger
Transarterial embolization is an established minimally invasive treatment for solid tumors. Unintended inflammation, foreign body reactions and ischemia-triggered neoangiogenesis are clinical drawbacks of permanent embolic materials. The aim of the current study was to characterize a new type of biodegradable starch microsphere with regard to angiographic and histopathological features such as patterns of acute arterial occlusion as well as induction of tissue necrosis, microsphere biodegradation, and inflammation and foreign body reactions during follow-up...
January 1, 2017: Journal of Biomaterials Applications
Dong Hae Ho, Ryun Geun Song, Qijun Sun, Won-Hyeong Park, So Young Kim, Changhyun Pang, Do Hwan Kim, Sang-Youn Kim, Jinkee Lee, Jeong Ho Cho
We reported the development of a transparent stretchable crack-enhanced microfluidic capacitive sensor array for use in E-skin applications. The microfluidic sensor was fabricated through a simple lamination process involving two silver nanowire (AgNW)-embedded rubbery microfluidic channels arranged in a crisscross fashion. The sensing performance was optimized by testing a variety of sensing liquids injected into the channels. External mechanical stimuli applied to the sensor induced the liquid to penetrate the deformed micro cracks on the rubber channel surface...
December 5, 2017: ACS Applied Materials & Interfaces
Miguel González-Pinto, Yuri Martínez-Ratón, Enrique Velasco
We use the Dynamic Density-Functional Formalism and the Fundamental Measure Theory as applied to a fluid of parallel hard squares to study the dynamics of heterogeneous growth of non-uniform phases with columnar and crystalline symmetries. The hard squares are (i) confined between soft repulsive walls with a square symmetry, or (ii) exposed to external potentials that mimic the presence of obstacles with circular, square, rectangular or triangular symmetries. For the first case the final equilibrium profile of a well commensurated cavity consists of a crystal phase with highly localized particles in concentric square layers at the nodes of a slightly deformed square lattice...
December 4, 2017: Soft Matter
Mathieu Jozwiak, Jonathan Melka, Mario Rienzo, Alain Bizé, Lucien Sambin, Luc Hittinger, Alain Berdeaux, Jin Bo Su, Belaid Bouhemad, Bijan Ghaleh
BACKGROUND: Left ventricular (LV) dysfunction develops during LV hypertrophy and particularly during tachycardia. Thus we investigated the effects of heart rate (HR) reduction with ivabradine, an If-channel blocker, on LV twist and untwist which represents myocardial deformation occurring during the overall systole and diastole and therefore provide valuable evaluation of global LV systolic and diastolic function. METHODS: Eight chronically instrumented pigs receiving continuous angiotensin II infusion during 28days to induce chronic hypertension and LV hypertrophy...
November 21, 2017: International Journal of Cardiology
Weiguang Yang, Frank L Hanley, Frandics P Chan, Alison L Marsden, Irene E Vignon-Clementel, Jeffrey A Feinstein
BACKGROUND: Up to 90% of individuals with Alagille syndrome have congenital heart diseases. Peripheral pulmonary artery stenosis (PPS), resulting in right ventricular hypertension and pulmonary flow disparity, is one of the most common abnormalities, yet the hemodynamic effects are ill-defined, and optimal patient management and treatment strategies are not well established. The purpose of this pilot study is to use recently refined computational simulation in the setting of multiple surgical strategies, to examine the influence of pulmonary artery reconstruction on hemodynamics in this population...
December 1, 2017: Congenital Heart Disease
Agostino Stilli, Helge A Wurdemann, Kaspar Althoefer
The recent decade has seen an astounding increase of interest and advancement in a new field of robotics, aimed at creating structures specifically for the safe interaction with humans. Softness, flexibility, and variable stiffness in robotics have been recognized as highly desirable characteristics for many applications. A number of solutions were proposed ranging from entirely soft robots (such as those composed mainly from soft materials such as silicone), via flexible continuum and snake-like robots, to rigid-link robots enhanced by joints that exhibit an elastic behavior either implemented in hardware or achieved purely by means of intelligent control...
March 2017: Soft Robotics
Qian-Yi Hu, Da Kang, Ru Wang, A-Qiang Ding, Ghulam Abbas, Meng Zhang, Lin Qiu, Hui-Feng Lu, Hui-Jie Lu, Ping Zheng
Anaerobic ammonium oxidation (anammox) process is regarded as a promising nitrogen removal technology to treat ammonium wastewaters in a wide concentration range. Oligotrophic anaerobic ammonia oxidation bacteria (O-AnAOB) culture has been successfully achieved from a new anammox system to treat superlow ammonium concentration wastewaters. In this work, the O-AnAOB culture was compared with the eutrophic AnAOB (E-AnAOB) culture to reveal its physiological, morphological, and ecological features. Results showed that the specific anammox activity (SAA) of O-AnAOB culture was 0...
November 27, 2017: Applied Microbiology and Biotechnology
Laura E van Heerden, Niek van Wieringen, Kees Koedooder, Coen R N Rasch, Bradley R Pieters, Arjan Bel
PURPOSE: Structure-based deformable image registration (DIR) can be used to calculate accumulated dose volume histogram parameters for cervical cancer brachytherapy (BT). The purpose of this study is to investigate dose warping uncertainties for the accumulated dose to the 2 cm3 receiving the highest dose [Formula: see text] in the rectal wall, using a physically realistic model (PRM) describing rectal wall deformation. METHODS AND MATERIALS: For 10 patients, treated with MRI-guided pulsed dose rate BT (two times 24 × 0...
November 22, 2017: Brachytherapy
Ying Zhou, Dahou Yang, Yinning Zhou, Bee Luan Khoo, Jongyoon Han, Ye Ai
Mechanical properties of cells, reflective of various biochemical characteristics such as gene expression and cytoskeleton, are promising label-free biomarkers for studying and characterizing cells. Electrical properties of cells, dependent on the cellular structure and content, are also label-free indicators of cell states and phenotype. In this work, we have developed a microfluidic device that is able to simultaneously characterize the mechanical and electrical properties of individual biological cells in a high-throughput manner (> 1,000 cells/min)...
November 27, 2017: Analytical Chemistry
Sarah Robinson, Michal Huflejt, Pierre Barbier de Reuille, Siobhan A Braybrook, Martine Schorderet, Didier Reinhardt, Cris Kuhlemeier
How complex developmental-genetic networks are translated into organs with specific 3D shapes remains an open question. This question is particularly challenging because the elaboration of specific shapes is in essence a question of mechanics. In plants, this means how the genetic circuitry affects the cell wall. The mechanical properties of the wall and their spatial variation are the key factors controlling morphogenesis in plants. However, these properties are difficult to measure and investigating their relation to genetic regulation is particularly challenging...
November 22, 2017: Plant Cell
Hani Sbitany
Prepectoral breast reconstruction has emerged as an excellent technique for postmastectomy reconstruction, as it allows for full preservation of a patient's pectoralis major muscle and chest wall function. This reduces pain, eliminates animation deformity, and results in high patient satisfaction. Safely performed prepectoral breast reconstruction requires a careful patient selection process before committing to the procedure, taking into account comorbidities, radiation status, and oncologic criteria such as tumor location and breast cancer stage...
December 2017: Plastic and Reconstructive Surgery
Rajiv R Iyer, Benjamin D Elder, Tomas Garzon-Muvdi, Justin M Sacks, Ian Suk, Jean-Paul Wolinsky
BACKGROUND: Surgical treatment of severe cervicothoracic kyphotic deformity may require the use of 3-column osteotomies such as the pedicle subtraction osteotomy and vertebral column resection (VCR), or VCR with anterior longitudinal ligament resection. Such procedures are extensive and are associated with high intra- and perioperative morbidity, in part, due to the need for risky reduction maneuvers. OBJECTIVE: To describe a novel technique utilizing a laterally placed articulating hinge to facilitate kyphotic deformity correction of the cervicothoracic spine...
November 18, 2017: Operative Neurosurgery (Hagerstown, Md.)
Kirsten L Poehling-Monaghan, Aaron J Krych, Bruce A Levy, Robert T Trousdale, Rafael J Sierra
Background: The success of hip surgery in treating acetabular retroversion depends on the severity of the structural deformity and on selecting the correct patient for open or arthroscopic procedures. Purpose: To compare a group of patients with retroverted hips treated successfully with hip arthroscopy with a group of patients with retroverted hips that failed arthroscopic surgery, with special emphasis on (1) patient characteristics, (2) perioperative radiographic parameters, (3) intraoperative findings and concomitant procedures, and (4) patient sex...
November 2017: Orthopaedic Journal of Sports Medicine
Mauryn C Nweke, R Graham McCartney, Daniel G Bracewell
Mechanical characterisation of agarose-based resins is an important factor in ensuring robust chromatographic performance in the manufacture of biopharmaceuticals. Pressure-flow profiles are most commonly used to characterise these properties. There are a number of drawbacks with this method, including the potential need for several re-packs to achieve the desired packing quality, the impact of wall effects on experimental set up and the quantities of chromatography media and buffers required. To address these issues, we have developed a dynamic mechanical analysis (DMA) technique that characterises the mechanical properties of resins based on the viscoelasticity of a 1ml sample of slurry...
November 18, 2017: Journal of Chromatography. A
Mingzhong Gao, Bin Yu, Zhiqiang Qiu, Xiangang Yin, Shengwei Li, Qiang Liu
Rectangular caverns are increasingly used in underground engineering projects, the failure mechanism of rectangular cavern wall rock is significantly different as a result of the cross-sectional shape and variations in wall stress distributions. However, the conventional computational method always results in a long-winded computational process and multiple displacement solutions of internal rectangular wall rock. This paper uses a Laurent series complex method to obtain a mapping function expression based on complex variable function theory and conformal transformation...
2017: PloS One
Ahmed Shawky, Ali Ezzati, Ramachandran Govindasamy, Branko Krajnovic, Belal El-Nady, Galal Zaki Said
BACKGROUND: Cement augmentation techniques are standard treatments for osteoporotic vertebral fractures. Compared to vertebroplasty, kyphoplasty is associated with lower rates of cement leak and better deformity correction, however, posterior wall fractures are relative, but not absolute, contraindications for both techniques and hence treatment practices vary among spine centers. PURPOSE: The primary aim of this study was to assess our center's incidence of posterior cement leakage in osteoporotic vertebral fractures with posterior wall injury treated by balloon kyphoplasty...
November 14, 2017: Spine Journal: Official Journal of the North American Spine Society
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