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https://www.readbyqxmd.com/read/28449483/epicardial-left-atrial-appendage-closure-comparison-of-surgical-techniques-in-an-ex-vivo-model
#1
Nikolas Mirow, Sebastian Vogt, Marc Irqsusi, Rainer Moosdorf, Andreas Kirschbaum
BACKGROUND: Formation of clots in the left atrial appendage (LAA) may lead to embolism and consecutive cerebral stroke. This risk is reduced by closure and resection. To address the efficacy of surgical LAA closure, resilience to pneumatic pressure was studied. Different surgical techniques were compared in an experimental model. METHODS: From freshly slaughtered pigs cardiopulmonary preparations were taken. The left atrium was clamped airtight and the LAA was cannulated...
March 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28449480/reconstruction-of-mediastinal-vessels-for-invasive-thymoma-a-retrospective-analysis-of-25-cases
#2
Yifeng Sun, Chang Gu, Jianxin Shi, Wentao Fang, Qingquan Luo, Dingzhong Hu, Shijie Fu, Xufeng Pan, Yong Chen, Yu Yang, Haitang Yang, Heng Zhao, Haiquan Chen
BACKGROUND: Discuss an appropriate strategy for treatment of invasive thymoma invading adjacent great vessels. METHODS: A retrospective study on 25 patients with invasive thymoma invading neighboring great vessels was performed. The corresponding data including clinical presentation, operation procedure, adjuvant radio-chemotherapy and follow-up were reviewed. RESULTS: Twenty of 25 (80%) patients with invasive thymoma underwent complete resection of the tumor along with vessel reconstruction...
March 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28446618/the-role-of-feeding-morphology-and-competition-in-governing-the-diet-breadth-of-sympatric-stomatopod-crustaceans
#3
Maya S deVries
Competition for food drives divergence and specialization in feeding morphology. Stomatopod crustaceans have two kinds of highly specialized feeding appendages: either elongate spear-like appendages (spearers) used to ambush soft-bodied evasive prey or hammer-like appendages (smashers) that produce extremely high forces used both to break hard-shelled prey and to capture evasive prey. To evaluate associations between appendage type and feeding ecology, the diet of two small smasher and spearer species (size range: 21-27 mm) that co-occur were compared...
April 2017: Biology Letters
https://www.readbyqxmd.com/read/28445464/burgess-shale-fossils-illustrate-the-origin-of-the-mandibulate-body-plan
#4
Cédric Aria, Jean-Bernard Caron
Retracing the evolutionary history of arthropods has been one of the greatest challenges in biology. During the past decade, phylogenetic analyses of morphological and molecular data have coalesced towards the conclusion that Mandibulata, the most diverse and abundant group of animals, is a distinct clade from Chelicerata, in that its members possess post-oral head appendages specialized for food processing, notably the mandible. The origin of the mandibulate body plan, however, which encompasses myriapods, crustaceans and hexapods, has remained poorly documented...
April 26, 2017: Nature
https://www.readbyqxmd.com/read/28444830/gene-expression-reveals-evidence-for-egfr-dependent-proximal-distal-limb-patterning-in-a-myriapod
#5
Ralf Janssen
Evolution of segmented limbs is one of the key innovations of Arthropoda, allowing development of functionally specific specialized head and trunk appendages, a major factor behind their unmatched evolutionary success. Proximodistal limb patterning is controlled by two regulatory networks in the vinegar fly Drosophila melanogaster, and other insects. The first is represented by the function of the morphogens Wingless (Wg) and Decapentaplegic (Dpp); the second by the EGFR-signaling cascade. While the role of Wg and Dpp has been studied in a wide range of arthropods representing all main branches, that is, Pancrustacea (= Hexapoda + Crustacea), Myriapoda and Chelicerata, investigation of the potential role of EGFR-signaling is restricted to insects (Hexapoda)...
April 26, 2017: Evolution & Development
https://www.readbyqxmd.com/read/28444700/fluorescence-lifetime-imaging-and-super-resolution-microscopies-shed-light-on-the-directed-and-self-assembly-of-functional-porphyrins-onto-carbon-nanotubes-and-flat-surfaces
#6
Boyang Mao, David González Calatayud, Vincenzo Mirabello, Haobo Ge, Benjamin J Hodges, Robert M J Jacobs, Ashley M Shepherd, José Alberto Ribeiro Martins, Navaratnarajah Kuganathan, Jorge Bernardino De La Serna, Stanley W Botchway, Sofia Ioana Pascu
Two new routes to functionalized SWNTs have been established using a bulky Zn(II)-porphyrin featuring thiolate groups at the periphery. We probed the optical properties of this Zinc(II)-substituted, bulky aryl porphyrin and those of the corresponding new nano-composites with single walled carbon nanotube (SWNTs) and coronene, as a model for graphene. We report hereby on: (i) the supramolecular interactions between the pristine SWNTs and Zn(II)-porphyrin by virtue of π-π stacking, and (ii) a novel covalent binding strategy based on the Bingel reaction...
April 25, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28442438/dorsal-fin-development-in-flounder-paralichthys-olivaceus-bud-formation-and-its-cellular-origin
#7
Jie Chen, Xiaoyu Liu, Xiaohua Yao, Fei Gao, Baolong Bao
The development of the median fin has not been investigated extensively in teleosts, although in other fishes it has been proposed that it involves the same genetic programs operating in the paired appendages. Adult median fins develop from the larval bud; therefore an investigation of fin bud formation and its cellular origin is essential to understanding the maturation mechanisms. In Paralichthys olivaceus, skeletogenesis proceeds from an anterior to posterior direction providing a good opportunity to study the formation of dorsal fin bud...
April 22, 2017: Gene Expression Patterns: GEP
https://www.readbyqxmd.com/read/28440455/%C3%AE-adrenoceptor-mediated-enhanced-inducibility-of-atrial-fibrillation-in-a-canine-system-inflammation-model
#8
Ying-Ying Chen, Ze-Wei Sun, Jian-Ping Jiang, Xiao-Dong Kang, Lin-Lin Wang, Yue-Liang Shen, Xu-Dong Xie, Liang-Rong Zheng
The exact mechanism associated with inflammation and atrial fibrillation (AF) remains unknown. The aim of the present study was to investigate the roles of connexin 43 (Cx43) and a1‑adrenergic receptor (α1‑AR) activation in the pathogenesis of system inflammation‑induced AF. A canine model of chronic low‑grade system inflammation was established by administrating a low dose of lipopolysaccharide (LPS; 0.1 µg/kg) for 2 weeks. Programmed stimulation was applied on the right atrial appendage to determine the effective refractory periods (ERP) and the window of vulnerability (WOV)...
April 13, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28439617/-stroke-prophylaxis-in-atrial-fibrillation-when-how-and-for-whom
#9
T Maurer, C Sohns
In patients suffering from atrial fibrillation (AF), modern antithrombotic therapy and anticoagulation strategies should be individualized based on shared decision making including patient preferences and the absolute and relative risks of stroke and bleeding. Estimation of the individual risk for stroke is still based on the CHA2DS2-VASc score. Based on the most recent guidelines for the management of AF, oral anticoagulation therapy should be considered for men with a CHA2DS2-VASc score ≥1 and women with a score ≥2, balancing the expected stroke reduction, risk of bleeding and patient preference...
April 24, 2017: Herz
https://www.readbyqxmd.com/read/28439533/the-anatomical-placode-in-reptile-scale-morphogenesis-indicates-shared-ancestry-among-skin-appendages-in-amniotes
#10
Nicolas Di-Poï, Michel C Milinkovitch
Most mammals, birds, and reptiles are readily recognized by their hairs, feathers, and scales, respectively. However, the lack of fossil intermediate forms between scales and hairs and substantial differences in their morphogenesis and protein composition have fueled the controversy pertaining to their potential common ancestry for decades. Central to this debate is the apparent lack of an "anatomical placode" (that is, a local epidermal thickening characteristic of feathers' and hairs' early morphogenesis) in reptile scale development...
June 2016: Science Advances
https://www.readbyqxmd.com/read/28438723/long-term-outcomes-of-minimally-invasive-surgical-ablation-for-atrial-fibrillation-a-single-center-experience
#11
Aditya Saini, Yuhning L Hu, Vigneshwar Kasirajan, Frederick T Han, Muhammad Z Khan, Luke Wolfe, Sampath Gunda, Jayanthi N Koneru, Kenneth A Ellenbogen
BACKGROUND: Minimally invasive surgical AF ablation delivers RF energy via a thoracoscopic approach to perform pulmonary vein isolation and LA ganglionic plexi ablation. Data on long term outcomes of MISAA is lacking. OBJECTIVE: We report 5 year follow-up data from a prospective cohort of patients who underwent MISAA at a single center. METHODS: One hundred nine consecutive patients (60 paroxysmal, 49 persistent, mean age 62.7±9.3 years) underwent MISAA with left atrial appendage exclusion by a single surgeon between 2006 and 2012...
April 21, 2017: Heart Rhythm: the Official Journal of the Heart Rhythm Society
https://www.readbyqxmd.com/read/28438500/ap2-%C3%AE-modulates-cystic-fibrosis-transmembrane-conductance-regulator-function-in-the-human-intestine
#12
Vandana Kumari, Shruti Desai, Nadia A Ameen
BACKGROUND: AP2 is a clathrin-based endocytic adaptor complex comprising α, β2, μ2 and σ2 subunits. μ2 regulates CFTR endocytosis. The α subunit interacts with CFTR in the intestine but its physiologic significance is unclear. METHODS: CFTR short circuit current was measured in intestinal T84 cells following shRNA knock down of AP2α (AP2αKD). Clathrin-coated structures (CCS) were immunolabeled and quantified in AP2αKD intestinal Caco2BBe (C2BBe) cells. GST tagged human AP2α appendage domain was cloned and its interaction with CFTR determined by GST pull down assay...
April 21, 2017: Journal of Cystic Fibrosis: Official Journal of the European Cystic Fibrosis Society
https://www.readbyqxmd.com/read/28438308/cardiovascular-outcomes-with-surgical-left-atrial-appendage-exclusion-in-patients-with-atrial-fibrillation-who-underwent-valvular-heart-surgery-from-the-national-inpatient-sample-database
#13
Ayman Elbadawi, Odunayo Olorunfemi, Gbolahan O Ogunbayo, Marwan Saad, Islam Y Elgendy, Zainab Arif, Haytham Badran, Deola Saheed, Hamdy M A Ahmed, Mohan Rao
Left atrial appendage (LAA) exclusion is a commonly performed procedure to reduce the embolic events in patients with atrial fibrillation (AF) who underwent cardiac surgeries. Our study aimed to evaluate the in-hospital outcomes of LAA exclusion in patients with AF who underwent valvular heart surgeries. We queried the Nationwide Inpatient Sample Database from 1998 to 2013 for patients with the International Classification of Diseases, Ninth Edition, Clinical Modification, diagnosis codes for AF and underwent any valvular heart surgery...
March 29, 2017: American Journal of Cardiology
https://www.readbyqxmd.com/read/28436533/left-atrial-appendage-electrical-isolation-for-atrial-fibrillation-ice-and-fire
#14
EDITORIAL
Jorge Romero, Andrea Natale, Luigi Di Biase
No abstract text is available yet for this article.
April 24, 2017: Pacing and Clinical Electrophysiology: PACE
https://www.readbyqxmd.com/read/28434057/predictive-control-of-intersegmental-tarsal-movements-in-an-insect
#15
Alicia Costalago-Meruelo, David M Simpson, Sandor M Veres, Philip L Newland
In many animals intersegmental reflexes are important for postural and movement control but are still poorly undesrtood. Mathematical methods can be used to model the responses to stimulation, and thus go beyond a simple description of responses to specific inputs. Here we analyse an intersegmental reflex of the foot (tarsus) of the locust hind leg, which raises the tarsus when the tibia is flexed and depresses it when the tibia is extended. A novel method is described to measure and quantify the intersegmental responses of the tarsus to a stimulus to the femoro-tibial chordotonal organ...
April 22, 2017: Journal of Computational Neuroscience
https://www.readbyqxmd.com/read/28433223/risk-of-intraatrial-thrombi-after-thoracoscopic-ablation-in-absence-of-heparin-and-appendage-closure
#16
Petr Budera, Pavel Osmancik, Dalibor Herman, David Talavera, Robert Petr, Zbynek Straka
BACKGROUND: Catheter and surgical ablation of atrial fibrillation (AF) can be associated with a risk of thromboembolic events. The goal of this study was to assess optimal anticoagulation management during thoracoscopic ablation of AF. METHODS: Fifty-two patients with persistent or long-standing persistent AF underwent hybrid ablation consisting of thoracoscopic ablation followed by electrophysiologic (EP) evaluation and consecutive ablation if indicated. The thoracoscopic ablation was performed using three different anticoagulation protocols: (1) without periprocedural heparin and without occlusion of the left atrial appendage; (2) with periprocedural heparin but without left atrial appendage occlusion; and (3) with periprocedural heparin and left atrial appendage occlusion...
April 19, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28432672/para-atrial-non-acute-mediastinal-hematoma-after-left-atrial-maze-procedure-mimicking-tumor-in-a-patient-with-treated-melanoma
#17
G Schaiberger, D Pucar, V Patel, B Bateson, H Williams, W Bates
INTRODUCTION: The Cox Maze III procedure is considered the gold standard open surgical procedure for management of atrial fibrillation. This article outlines a unique case of a para-atrial mediastinal hematoma following a bilateral thoracoscopic left atrial Maze procedure mimicking malignancy. REPORT: A 60-year-old male, with past history of melanoma, underwent bilateral thoracoscopic left atrial mini maze procedure with radiofrequency energy and exclusion of the left atrial appendage...
April 21, 2017: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
https://www.readbyqxmd.com/read/28431332/sperm-morphology-of-the-leafhopper-diaphorina-citri-kuwayama-hemiptera-sternorrhyncha-psylloidea-liviidae
#18
Marcelo Silva Barcellos, Jamile Fernanda Silva Cossolin, Glenda Dias, José Lino-Neto
In this study, by using light and electron microscopy, we describe the sperm morphology of the leafhopper Diaphorina citri, a serious pest of citrus throughout the world. In this species the sperm measures 538.49±8.75μm in length, and as observed in psylloids, the sperm, when manipulated, opens into two filaments, one of which is attached to the nuclear base and the other becomes free. Along the flagellum, and only of it, there are lateral projections, about 2μm in length. Furthermore, at the end of the flagellum three appendages, with approximately 7μm in length, are observed...
April 8, 2017: Micron: the International Research and Review Journal for Microscopy
https://www.readbyqxmd.com/read/28429702/case-images-successful-ablation-of-paroxysmal-atrial-fibrillation-originating-in-left-atrial-appendage-with-single-shot-cryoballoon-technique
#19
Uğur Canpolat, Banu Evranos, Nihan Bahadır, Hikmet Yorgun, Kudret Aytemir
No abstract text is available yet for this article.
April 2017: Türk Kardiyoloji Derneği Arşivi: Türk Kardiyoloji Derneğinin Yayın Organıdır
https://www.readbyqxmd.com/read/28429136/is-there-an-alternative-treatment-for-patients-intolerant-to-antiplatelet-therapy-if-percutaneous-left-atrial-appendage-closure-is-considered
#20
F Akca, N J Verberkmoes, S E Verstraeten, C van Laar, B P van Putte, A H M van Straten
INTRODUCTION: Left atrial appendage (LAA) closure has become of major interest for patients with atrial fibrillation intolerant to oral anticoagulation therapy (OAC). Patients with a contraindication to both OAC and antiplatelet therapy are not eligible for percutaneous LAA closure. We aimed to find an alternative treatment for these specific patients. METHODS: From March 2014 until December 2015 five patients were referred for percutaneous LAA closure. Alternative treatment was necessary due to an absolute contraindication to OAC and antiplatelet therapy (n = 4) or after previous failed percutaneous device implantation (n = 1)...
April 20, 2017: Netherlands Heart Journal
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