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https://www.readbyqxmd.com/read/27909479/atrial-fibrillation-ablation-in-adults-with-repaired-congenital-heart-disease
#1
REVIEW
Marta Acena Md, Ignasi Anguera Md PhD, Paolo D Dallaglio Md, Marcos Rodriguez Md, Xavier Sabaté Md PhD
The incidence of atrial fibrillation (AF) in congenital heart disease (CHD) adults has increased in the past decades due to a longer life expectancy of this population where the subjects are exposed to cardiac overflow, overpressure and structural changes for years. The literature regarding AF ablation in repaired CHD adults emphasizes the importance of intracardiac echocardiography (ICE) to perform the transseptal puncture and the ablation procedure in the left atrium (LA), both effectively and safely. In small case control studies, where the predominant congenital cardiomyopathy was the atrial septal defect, the most common strategy for ablation was antral isolation of the pulmonary veins showing results, at one year follow-up, similar to those in the general population...
February 2016: Journal of Atrial Fibrillation
https://www.readbyqxmd.com/read/27907158/effects-of-exposure-to-blast-overpressure-on-intracranial-pressure-and-blood-brain-barrier-permeability-in-a-rat-model
#2
Usmah Kawoos, Ming Gu, Jason Lankasky, Richard M McCarron, Mikulas Chavko
Exposure to blast overpressure (BOP) activates a cascade of pathological processes including changes in intracranial pressure (ICP) and blood-brain barrier (BBB) permeability resulting in traumatic brain injury (TBI). In this study the effect of single and multiple exposures at two intensities of BOP on changes in ICP and BBB permeability in Sprague-Dawley rats was evaluated. Animals were exposed to a single or three repetitive (separated by 0.5 h) BOPs at 72 kPa or 110 kPa. ICP was monitored continuously via telemetry for 6 days after exposure to BOP...
2016: PloS One
https://www.readbyqxmd.com/read/27907043/thermodynamic-simulation-of-carbonate-cements-water-carbon-dioxide-equilibrium-in-sandstone-for-prediction-of-precipitation-dissolution-of-carbonate-cements
#3
Yiping Duan, Mingshi Feng, Xinyan Zhong, Ruishu Shang, Lihong Huang
Carbonate cements, such as calcite, dolomite, ferrocalcite and ankerite, play important roles in the formation of pores in sandstones: precipitation of carbonate cements modifies pores and inhibits compaction, while dissolution creates secondary pores. This work proposed a precipitation-dissolution model for carbonate cements-CO2-H2O system by means of ion equilibrium concentration ([M2+], M = Ca, Mg, Fe or Mn) with different factors, such as temperature, depth, pH, [Formula: see text], variable rock composition and overpressure...
2016: PloS One
https://www.readbyqxmd.com/read/27885998/bi-ventricular-finite-element-model-of-right-ventricle-overload-in-the-healthy-rat-heart
#4
Fulufhelo Masithulela
BACKGROUND: The recognition of RV overpressure is critical to human life, as this may signify morbidity and mortality. Right ventricle (RV) dysfunction is understood to have an impact on the performance of the left ventricle (LV), but the mechanisms remain poorly understood. It is understood that ventricular compliance has the ability to affect cardiac performance. In this study, a bi-ventricular model of the rat heart was used in preference to other, single-ventricle models. Finite element analysis (FEA) of the bi-ventricular model provides important information on the function of the healthy heart...
November 25, 2016: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/27882753/-hemangioblastoma-cerebellum-during-pregnancy
#5
E Bočková, S Pánková
OBJECTIVE: Authors describe a case of woman in the age of 27 years, 36th+0 week of pregnancy, who was hospitalized for headache and vomittin. Magnestic resonance showed the cystic expansion in the left hemisphere of cerebellum with the overpressure in the IV. ventricle and wiht the beginning obstructive hydrocephalus. STUDY TYPE: Case report. SETTING: Hospital of Uherské Hradiště, Inc., Gynecology and Maternity Department. METHOD: Own observation...
2016: Ceská Gynekologie
https://www.readbyqxmd.com/read/27876800/rapid-laccolith-intrusion-driven-by-explosive-volcanic-eruption
#6
Jonathan M Castro, Benoit Cordonnier, C Ian Schipper, Hugh Tuffen, Tobias S Baumann, Yves Feisel
Magmatic intrusions and volcanic eruptions are intimately related phenomena. Shallow magma intrusion builds subsurface reservoirs that are drained by volcanic eruptions. Thus, the long-held view is that intrusions must precede and feed eruptions. Here we show that explosive eruptions can also cause magma intrusion. We provide an account of a rapidly emplaced laccolith during the 2011 rhyolite eruption of Cordón Caulle, Chile. Remote sensing indicates that an intrusion began after eruption onset and caused severe (>200 m) uplift over 1 month...
November 23, 2016: Nature Communications
https://www.readbyqxmd.com/read/27867790/magma-injection-into-a-long-lived-reservoir-to-explain-geodetically-measured-uplift-application-to-the-2007-2014-unrest-episode-at-laguna-del-maule-volcanic-field-chile
#7
Hélène Le Mével, Patricia M Gregg, Kurt L Feigl
Moving beyond the widely used kinematic models for the deformation sources, we present a new dynamic model to describe the process of injecting magma into an existing magma reservoir. To validate this model, we derive an analytical solution and compare its results to those calculated using the Finite Element Method. A Newtonian fluid characterized by its viscosity, density, and overpressure (relative to the lithostatic value) flows through a vertical conduit, intruding into a reservoir embedded in an elastic domain, leading to an increase in reservoir pressure and time-dependent surface deformation...
August 2016: Journal of Geophysical Research. Solid Earth
https://www.readbyqxmd.com/read/27830938/quantitative-electroencephalography-in-a-swine-model-of-blast-induced-brain-injury
#8
Chaoyang Chen, Chengpeng Zhou, John M Cavanaugh, Srinivasu Kallakuri, Alok Desai, Liying Zhang, Albert I King
OBJECTIVE: Electroencephalography (EEG) was used to examine brain activity abnormalities earlier after blast exposure using a swine model to develop a qEEG data analysis protocol. METHODS: Anaesthetized swine were exposed to 420-450 Kpa blast overpressure and survived for 3 days after blast. EEG recordings were performed at 15 minutes before the blast and 15 minutes, 30 minutes, 2 hours and 1, 2 and 3 days post-blast using surface recording electrodes and a Biopac 4-channel data acquisition system...
November 10, 2016: Brain Injury: [BI]
https://www.readbyqxmd.com/read/27822197/biomechanical-responses-of-the-brain-in-swine-subject-to-free-field-blasts
#9
Ke Feng, Liying Zhang, Xin Jin, Chaoyang Chen, Srinivasu Kallakuri, Tal Saif, John Cavanaugh, Albert King
Blast-induced traumatic brain injury (bTBI) is a signature wound of modern warfare. The current incomplete understanding of its injury mechanism impedes the development of strategies for effective protection of bTBI. Despite a considerable amount of experimental animal studies focused on the evaluation of brain neurotrauma caused by blast exposure, there is very limited knowledge on the biomechanical responses of the gyrenecephalic brain subjected to primary free-field blast waves imposed in vivo. This study aims to evaluate the external and internal mechanical responses of the brain against different levels of blast loading with Yucatan swine in free field...
2016: Frontiers in Neurology
https://www.readbyqxmd.com/read/27816376/effects-of-concentration-temperature-humidity-and-nitrogen-inert-dilution-on-the-gasoline-vapor-explosion
#10
Sheng Qi, Yang Du, Peili Zhang, Guoqing Li, Yi Zhou, Bo Wang
This study aims at providing basic information for the explosion-protecting technology in the gasoline storage and transportation process. Experiments were conducted to investigate the explosion parameters under different gasoline vapor concentrations (0.92-2.40%), temperatures (283-343K), relative humidities (35-98%), and oxygen concentrations (12.66-20.32%) in a 20L spherical vessel. Results show that both the maximum overpressure and the rate of pressure rise are quadratic functions of initial gasoline vapor concentration...
February 5, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27810409/a-novel-anti-pollution-filter-for-volatile-agents-during-cardiopulmonary-bypass-preliminary-tests
#11
Caetano Nigro Neto, Giovanni Landoni, Maria Angela Tardelli
OBJECTIVE: Concerns regarding pollution of the operating room by volatile anesthetics and effects on atmospheric ozone depletion exist. Volatile agents commonly are used during cardiopulmonary bypass to provide anesthesia independent of any supposed myocardial protective effects. The authors' aim was to create and to assess the performance of a prototype filter for volatile agents to be connected to the cardiopulmonary bypass circuit to avoid the emission of volatile agents to the operating room, and also to the environment without causing damage to the membrane oxygenator...
August 10, 2016: Journal of Cardiothoracic and Vascular Anesthesia
https://www.readbyqxmd.com/read/27807343/increased-methane-emissions-from-deep-osmotic-and-buoyant-convection-beneath-submarine-seeps-as-climate-warms
#12
Silvana S S Cardoso, Julyan H E Cartwright
High speeds have been measured at seep and mud-volcano sites expelling methane-rich fluids from the seabed. Thermal or solute-driven convection alone cannot explain such high velocities in low-permeability sediments. Here we demonstrate that in addition to buoyancy, osmotic effects generated by the adsorption of methane onto the sediments can create large overpressures, capable of recirculating seawater from the seafloor to depth in the sediment layer, then expelling it upwards at rates of up to a few hundreds of metres per year...
October 27, 2016: Nature Communications
https://www.readbyqxmd.com/read/27779957/explosive-decompression-with-resultant-air-gas-embolism-in-a-fourth-generation-fighter-at-ground-level
#13
Joe X Zhang, Jacob R Berry, Devin P Beckstrand
BACKGROUND: Arterial gas embolism (AGE) is a rare condition in the flying community most often only ever seen in flight while operating at high altitude or incidents involving hypobaric chambers. This article describes a severe case of AGE that occurred in a pilot of a fourth generation fighter aircraft at ground level. The environmental control system (ECS) malfunctioned, causing an overpressurized cockpit and a subsequent explosive decompression when the pilot opened the canopy to egress...
2016: Aerospace Medicine and Human Performance
https://www.readbyqxmd.com/read/27725728/impact-of-splenic-artery-ligation-after-major-hepatectomy-on-liver-function-regeneration-and-viability
#14
Jorge Carrapita, Ana Margarida Abrantes, Sofia Campelos, Ana Cristina Gonçalves, Dulce Cardoso, Ana Bela Sarmento-Ribeiro, Clara Rocha, Jorge Nunes Santos, Maria Filomena Botelho, José Guilherme Tralhão, Olivier Farges, Jorge Maciel Barbosa
It was reported that prevention of acute portal overpressure in small-for-size livers by inflow modulation results in a better postoperative outcome. The aim is to investigate the impact of portal blood flow reduction by splenic artery ligation after major hepatectomy in a murine model. Forty-eight rats were subjected to an 85% hepatectomy or 85% hepatectomy and splenic artery ligation. Both groups were evaluated at 24, 48, 72 and 120 post-operative hours: liver function, regeneration and viability. All methods and experiments were carried out in accordance with Coimbra University guidelines...
October 11, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27667724/tuning-the-activity-of-oxygen-in-lini0-8co0-15al0-05o2-battery-electrodes
#15
Khim Karki, Yiqing Huang, Sooyeon Hwang, Andrew D Gamalski, M Stanley Whittingham, Guangwen Zhou, Eric A Stach
Layered transition metal oxides such as LiNi0.8Co 0.15Al0.05O2 (NCA) are highly desirable battery electrodes. However, these materials suffer from thermal runaway caused by deleterious oxygen loss and surface phase transitions when in highly overcharged and overheated conditions, prompting serious safety concerns. Using in situ environmental transmission electron microscopy techniques, we demonstrate that surface oxygen loss and structural changes in the highly overcharged NCA particles are suppressed by exposing them to an oxygen-rich environment...
October 6, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27604744/a-simplified-workflow-for-protein-quantitation-of-rat-brain-tissues-using-label-free-proteomics-and-spectral-counting
#16
Angela M Boutté, Shonnette F Grant, Jitendra R Dave
Mass spectrometry-based proteomics is an increasingly valuable tool for determining relative or quantitative protein abundance in brain tissues. A plethora of technical and analytical methods are available, but straightforward and practical approaches are often needed to facilitate reproducibility. This aspect is particularly important as an increasing number of studies focus on models of traumatic brain injury or brain trauma, for which brain tissue proteomes have not yet been fully described. This text provides suggested techniques for robust identification and quantitation of brain proteins by using molecular weight fractionation prior to mass spectrometry-based proteomics...
2016: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27604716/cellular-mechanisms-and-behavioral-outcomes-in-blast-induced-neurotrauma-comparing-experimental-setups
#17
Zachary S Bailey, W Brad Hubbard, Pamela J VandeVord
Blast-induced neurotrauma (BINT) has increased in incidence over the past decades and can result in cognitive issues that have debilitating consequences. The exact primary and secondary mechanisms of injury have not been elucidated and appearance of cellular injury can vary based on many factors, such as blast overpressure magnitude and duration. Many methodologies to study blast neurotrauma have been employed, ranging from open-field explosives to experimental shock tubes for producing free-field blast waves...
2016: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27603017/tailoring-the-blast-exposure-conditions-in-the-shock-tube-for-generating-pure-primary-shock-waves-the-end-plate-facilitates-elimination-of-secondary-loading-of-the-specimen
#18
Matthew Kuriakose, Maciej Skotak, Anthony Misistia, Sudeepto Kahali, Aravind Sundaramurthy, Namas Chandra
The end plate mounted at the mouth of the shock tube is a versatile and effective implement to control and mitigate the end effects. We have performed a series of measurements of incident shock wave velocities and overpressures followed by quantification of impulse values (integral of pressure in time domain) for four different end plate configurations (0.625, 2, 4 inches, and an open end). Shock wave characteristics were monitored by high response rate pressure sensors allocated in six positions along the length of 6 meters long 229 mm square cross section shock tube...
2016: PloS One
https://www.readbyqxmd.com/read/27551260/astrocyte-reactivity-following-blast-exposure-involves-aberrant-histone-acetylation
#19
Zachary S Bailey, Michael B Grinter, Pamela J VandeVord
Blast induced neurotrauma (BINT) is a prevalent injury within military and civilian populations. The injury is characterized by persistent inflammation at the cellular level which manifests as a multitude of cognitive and functional impairments. Epigenetic regulation of transcription offers an important control mechanism for gene expression and cellular function which may underlie chronic inflammation and result in neurodegeneration. We hypothesize that altered histone acetylation patterns may be involved in blast induced inflammation and the chronic activation of glial cells...
2016: Frontiers in Molecular Neuroscience
https://www.readbyqxmd.com/read/27531021/pathophysiology-of-the-inner-ear-after-blast-injury-caused-by-laser-induced-shock-wave
#20
Katsuki Niwa, Kunio Mizutari, Toshiyasu Matsui, Takaomi Kurioka, Takeshi Matsunobu, Satoko Kawauchi, Yasushi Satoh, Shunichi Sato, Akihiro Shiotani, Yasushi Kobayashi
The ear is the organ that is most sensitive to blast overpressure, and ear damage is most frequently seen after blast exposure. Blast overpressure to the ear results in sensorineural hearing loss, which is untreatable and is often associated with a decline in the quality of life. In this study, we used a rat model to demonstrate the pathophysiological and structural changes in the inner ear that replicate pure sensorineural hearing loss associated with blast injury using laser-induced shock wave (LISW) without any conductive hearing loss...
2016: Scientific Reports
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