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https://www.readbyqxmd.com/read/28938375/difficult-implant-removals
#1
Amy Voedisch, Michele Hugin
PURPOSE OF REVIEW: Subdermal contraceptive implant insertions have rapidly increased worldwide. These devices are usually removed 3-5 years after insertion. Although removals are generally straightforward, difficult removals can occur. This review discusses the overall approach to potentially problematic removals and the appropriate steps to avoid complications and safely remove implants. RECENT FINDINGS: Given the rapid uptake of contraceptive implants and subsequent need for removals, an Implants Removal Task Force was formed to create standard protocols for difficult implant removals worldwide...
September 21, 2017: Current Opinion in Obstetrics & Gynecology
https://www.readbyqxmd.com/read/28938339/reduction-techniques-for-diaphyseal-femur-fractures
#2
Philip R Wolinsky, Justin F Lucas
Achieving and maintaining reduction in patients with a diaphyseal femur fracture may be difficult; therefore, thorough preoperative planning is required. To fully prepare for successful surgical management of diaphyseal femur fractures, surgeons must consider appropriate patient positioning and necessary tools, including surgical tables, traction devices, and instruments. Principles of acceptable reduction rely on the restoration of length, alignment, and rotation. Reduction of diaphyseal femur fractures should be attained in the least invasive manner, via percutaneous reduction techniques, if possible, to preserve fracture biology and promote successful fracture healing...
September 21, 2017: Journal of the American Academy of Orthopaedic Surgeons
https://www.readbyqxmd.com/read/28938308/sensor-based-physiologic-control-strategy-for-biventricular-support-with-rotary-blood-pumps
#3
Yu Wang, Steven C Koenig, Zhongjun Wu, Mark S Slaughter, Guruprasad A Giridharan
Rotary biventricular assist devices (BiVAD) are becoming a clinically accepted treatment option for end-stage biventricular failure. To improve BiVAD efficacy and safety, we propose a control algorithm to achieve the clinical objectives of maintaining left-right-sided balance, restoring physiologic flows, and preventing ventricular suction. The control algorithm consists of two proportional-integral (PI) controllers for left and right ventricular assist devices (LVAD and RVAD) to maintain differential pump pressure across LVAD (ΔPL) and RVAD (ΔPR) to provide left-right balance and physiologic flow...
September 21, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28938307/design-and-development-of-a-miniaturized-percutaneously-deployable-wireless-left-ventricular-assist-device-early-prototypes-and-feasibility-testing
#4
Brian Letzen, Jiheum Park, Zeynep Tuzun, Pramod Bonde
The current left ventricular assist devices (LVADs) are limited by a highly invasive implantation procedure in a severely unstable group of advanced heart failure patients. Additionally, the current transcutaneous power drive line acts as a nidus for infection resulting in significant morbidity and mortality. In an effort to decrease this invasiveness and eliminate drive line complications, we have conceived a wireless miniaturized percutaneous LVAD, capable of being delivered endovascularly with a tether-free operation...
September 21, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28938306/different-clinical-course-and-complications-in-interagency-registry-for-mechanically-assisted-circulatory-support-1-patients-managed-with-or-without-extracorporeal-membrane-oxygenation
#5
Jason J Han, Jennifer Chung, Carol W Chen, Ann C Gaffey, Alex Sotolongo, Christyna Justice, Alyse E Ameer, J Eduardo Rame, Christian Bermudez, Michael A Acker, Pavan Atluri
Extracorporeal membrane oxygenation (ECMO) as a bridge to left ventricular assist device (LVAD) implantation has shown promise in improving end-organ function and optimizing outcomes in some critically ill patients, but the practice remains controversial. Retrospective review of patients who received LVADs from May 2008 to September 2016 at a high-volume, tertiary care cardiovascular center was performed. Subjects were Interagency Registry for Mechanically Assisted Circulatory Support (INTERMACS) class 1 patients divided into ECMO bridge and non-ECMO bridge cohorts...
September 21, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28938305/a-useful-device-to-measure-kinetics-of-platelet-contraction
#6
Mitchell J George, Kevin R Aroom, Max A Skibber, Tushar Sharma, Charles E Wade, Charles S Cox, Brijesh S Gill
Platelet contraction provides a minimally invasive source for physiologic information. In this article, we describe a device that directly measures the kinetics of platelet contraction. Whole blood is injected between acrylic plates and an adherent clot forms. The bottom plate is fixed, and the top plate is attached to a wire cantilever. Platelet contraction drives deflection of the wire cantilever which is captured by a camera. Force generated by the clot with time is derived using beam equations. Force derivations were verified using a microelectromechanical (MEMS) force sensor...
September 21, 2017: ASAIO Journal: a Peer-reviewed Journal of the American Society for Artificial Internal Organs
https://www.readbyqxmd.com/read/28938250/listening-effort-how-the-cognitive-consequences-of-acoustic-challenge-are-reflected-in-brain-and-behavior
#7
Jonathan E Peelle
Everyday conversation frequently includes challenges to the clarity of the acoustic speech signal, including hearing impairment, background noise, and foreign accents. Although an obvious problem is the increased risk of making word identification errors, extracting meaning from a degraded acoustic signal is also cognitively demanding, which contributes to increased listening effort. The concepts of cognitive demand and listening effort are critical in understanding the challenges listeners face in comprehension, which are not fully predicted by audiometric measures...
September 21, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28938197/a-collagen-membrane-containing-osteogenic-protein-1-facilitates-bone-regeneration-in-a-rat-mandibular-bone-defect
#8
Manami Ozaki, Tadahiro Takayama, Takanobu Yamamoto, Yasumasa Ozawa, Mayu Nagao, Natsuko Tanabe, Akira Nakajima, Naoto Suzuki, Masao Maeno, Seiichi Yamano, Shuichi Sato
OBJECTIVES: Osteogenic protein-1 (OP-1) has shown osteoinductive activities and is useful for clinical treatments, including bone regeneration. Regenerative procedures using a bioabsorbable collagen membrane (BCM) are well established in periodontal and implant dentistry. We evaluated the subsequent effects of the BCM in combination with OP-1 on bone regeneration in a rat mandibular circular critical-sized bone defect in vivo. DESIGN: We used 8 rats that received surgery in both sides of the mandible, and created the total 16 defects which were divided into 4 groups: Group 1; no treatment, as a control, Group 2; BCM alone, Group 3; BCM containing low dose 0...
September 8, 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28938106/assessment-of-a-specifically-developed-bullet-casing-gun-for-the-stunning-of-water-buffaloes
#9
Carmen Meichtry, Urs Glauser, Matthieu Glardon, Steffen G Ross, Isabel Lechner, Beat P Kneubuehl, Dominic Gascho, Claudia Spadavecchia, Alois von Rotz, Ana Stojiljkovic, Michael H Stoffel
Water buffaloes and cattle differ considerably with respect to the anatomy of the head. As a result, captive bolt stunners often fail to reliably produce adequate loss of consciousness in water buffaloes and, thus, do not fulfill animal welfare requirements. The goal of the present study was to assess and validate a new stunning device for water buffaloes meeting animal welfare and occupational safety requirements. The newly designed bullet casing gun uses .357Mag/10.2g hollow point bullets and has additional safety features...
September 14, 2017: Meat Science
https://www.readbyqxmd.com/read/28938070/dynamics-of-water-monolayers-confined-by-chemically-heterogeneous-surfaces-observation-of-surface-induced-anisotropic-diffusion
#10
Mehdi Karzar Jeddi, Santiago Romero-Vargas Castrillón
Water present in confining geometries plays key roles in many systems of scientific and technological relevance. Prominent examples are living cells and nanofluidic devices. Despite its importance, a complete understanding of the dynamics of water in nanoscale confinement remains elusive. In this work, we use molecular dynamics (MD) simulation to investigate the diffusive dynamics of water monolayers confined in chemically heterogeneous silica slit pores. The effect of chemical heterogeneity is systematically investigated through the fraction f_SiOH of randomly distributed surface sites that possess hydroxyl functional groups...
September 22, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28938021/alterations-in-the-ability-to-maintain-balance-as-a-result-of-stochastic-resonance-whole-body-vibration-in-women
#11
Karolina Donocik, Magdalena Hartman-Petrycka, Agata Lebiedowska, Barbara Błońska-Fajfrowska
PURPOSE: A vertical posture makes it difficult to maintain balance especially in the elderly. Loss of balance leads to falls and injuries. In the present study, we evaluated whether balance maintenance can be improved with the use of stochastic resonance whole body vibration (SR-WBV). METHODS: An examination of balance, involving 187 women aged 19-74 years, was conducted using double-plate posturography pre and post SR-WBV. The SR-WBV trainings were performed using the SRT Zeptor Medical-plus noise device...
2017: PloS One
https://www.readbyqxmd.com/read/28937930/feasibility-of-a-multidisciplinary-caregiving-training-protocol-for-young-caregivers-in-families-with-als
#12
Melinda S Kavanaugh, Megan Howard, Lori Banker-Horner
Feasibility of a multidisciplinary caregiving training protocol for young caregivers in families with ALS. OBJECTIVES: To assess the feasibility of a multidisciplinary young caregiver group training protocol for children and youth who provide care to a family member with ALS. METHOD: Peer group experiential young caregiver model based on theories of self-management and self-efficacy. Training conducted by a multidisciplinary team of therapists in ALS (PT, OT, Speech and social work), as well as assistive device vendors...
September 22, 2017: Social Work in Health Care
https://www.readbyqxmd.com/read/28937917/head-impact-exposure-measured-in-a-single-youth-football-team-during-practice-drills
#13
Mireille E Kelley, Joeline M Kane, Mark A Espeland, Logan E Miller, Alexander K Powers, Joel D Stitzel, Jillian E Urban
OBJECTIVE This study evaluated the frequency, magnitude, and location of head impacts in practice drills within a youth football team to determine how head impact exposure varies among different types of drills. METHODS On-field head impact data were collected from athletes participating in a youth football team for a single season. Each athlete wore a helmet instrumented with a Head Impact Telemetry (HIT) System head acceleration measurement device during all preseason, regular season, and playoff practices...
September 12, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/28937748/bio-optics-and-bio-inspired-optical-materials
#14
Sirimuvva Tadepalli, Joseph M Slocik, Maneesh K Gupta, Rajesh R Naik, Srikanth Singamaneni
Through the use of the limited materials palette, optimally designed micro- and nanostructures, and tightly regulated processes, nature demonstrates exquisite control of light-matter interactions at various length scales. In fact, control of light-matter interactions is an important element in the evolutionary arms race and has led to highly engineered optical materials and systems. In this review, we present a detailed summary of various optical effects found in nature with a particular emphasis on the materials and optical design aspects responsible for their optical functionality...
September 22, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28937746/-juice-monsters-sub-ohm-vaping-and-toxic-volatile-aldehyde-emissions
#15
Soha Talih, Rola Salman, Nareg Karaoghlanian, Ahmad El-Hellani, Najat Aoun Saliba, Thomas Eissenberg, Alan Shihadeh
An emerging category of electronic cigarettes (ECIGs) are sub-Ohm devices (SODs) that operate at ten or more times the power of conventional ECIGs. Because carcinogenic volatile aldehyde (VAs) emissions increase sharply with power, SODs may expose users to greater VAs. In this study, we compared VA emissions from several SODs and found that across device, VAs and power were un-correlated unless power was normalized by coil surface area. VA emissions and liquid consumed were correlated highly. Analyzed in light of EU regulations limiting ECIG liquid nicotine concentration, these findings suggest potential regulatory levers and pitfalls for protecting public health...
September 22, 2017: Chemical Research in Toxicology
https://www.readbyqxmd.com/read/28937737/hollow-pd-ag-composite-nanowires-for-fast-responding-and-transparent-hydrogen-sensors
#16
Ji-Soo Jang, Shaopeng Qiao, Seon-Jin Choi, Gaurav Jha, Alana F Ogata, Won-Tae Koo, Dong-Ha Kim, Il-Doo Kim, Reginald M Penner
Pd based alloy materials with hollow nanostructures are ideal hydrogen (H2) sensor building blocks because of the ultra-high surface area afforded by this architecture. In this work, for the first time, we report a simple fabrication process for preparing hollow Pd-Ag alloy nanowires (Pd@Ag HNWs) by using the electrodeposition of lithographically patterned silver nanowires and followed galvanic replacement reaction (GRR) to form palladium. By controlling the GRR time of aligned Ag NWs within an aqueous Pd2+-containing solution, the compositional transition and morphological evolution from Ag NWs to Pd@Ag HNWs simultaneously occurred, and the relative atomic ratio between Pt and Ag was controlled...
September 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28937701/theoretical-study-on-geometric-electronic-and-catalytic-performances-of-fe-dopant-pairs-in-graphene
#17
Yanan Tang, Huadou Chai, Weiguang Chen, Xiao Cui, Yaqiang Ma, Mingyu Zhao, Xianqi Dai
The formation geometries, electronic structures and catalytic properties of monovacancy and divacancy graphene sheets with two embedded Fe dopants (2Fe-MG and 2Fe-DG) have been systematically investigated using the first-principles calculations. It was found that the configuration of 2Fe-DG is slightly more stable than that of 2Fe-MG sheets and the two doped Fe atoms in graphene (2Fe-graphene) as active sites could regulate the stability of gas molecules. In addition, the adsorption of O2 and CO molecules could modulate the electronic and magnetic properties of 2Fe-graphene systems...
September 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28937660/a-low-power-consumption-algorithm-for-efficient-energy-consumption-in-zigbee-motes
#18
Daniel Vaquerizo-Hdez, Pablo Muñoz, María D R-Moreno, David F Barrero
Wireless Sensor Networks (WSNs) are becoming increasingly popular since they can gather information from different locations without wires. This advantage is exploited in applications such as robotic systems, telecare, domotic or smart cities, among others. To gain independence from the electricity grid, WSNs devices are equipped with batteries, therefore their operational time is determined by the time that the batteries can power on the device. As a consequence, engineers must consider low energy consumption as a critical objective to design WSNs...
September 22, 2017: Sensors
https://www.readbyqxmd.com/read/28937644/american-sign-language-alphabet-recognition-using-a-neuromorphic-sensor-and-an-artificial-neural-network
#19
Miguel Rivera-Acosta, Susana Ortega-Cisneros, Jorge Rivera, Federico Sandoval-Ibarra
This paper reports the design and analysis of an American Sign Language (ASL) alphabet translation system implemented in hardware using a Field-Programmable Gate Array. The system process consists of three stages, the first being the communication with the neuromorphic camera (also called Dynamic Vision Sensor, DVS) sensor using the Universal Serial Bus protocol. The feature extraction of the events generated by the DVS is the second part of the process, consisting of a presentation of the digital image processing algorithms developed in software, which aim to reduce redundant information and prepare the data for the third stage...
September 22, 2017: Sensors
https://www.readbyqxmd.com/read/28937619/an-al%C3%A2-o%C3%A2-gating-substrate-for-the-greater-performance-of-field-effect-transistors-based-on-two-dimensional-materials
#20
Hang Yang, Shiqiao Qin, Xiaoming Zheng, Guang Wang, Yuan Tan, Gang Peng, Xueao Zhang
We fabricated 70 nm Al₂O₃ gated field effect transistors based on two-dimensional (2D) materials and characterized their optical and electrical properties. Studies show that the optical contrast of monolayer graphene on an Al₂O₃/Si substrate is superior to that on a traditional 300 nm SiO₂/Si substrate (2.4 times). Significantly, the transconductance of monolayer graphene transistors on the Al₂O₃/Si substrate shows an approximately 10-fold increase, due to a smaller dielectric thickness and a higher dielectric constant...
September 22, 2017: Nanomaterials
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