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Arctic Front

C L Amundson, N J Traub, A J Smith-Herron, P L Flint
Climate change is occurring rapidly at high latitudes, and subsequent changes in parasite communities may have implications for hosts including wildlife and humans. Waterfowl, in particular, harbor numerous parasites and may facilitate parasite movement across broad geographic areas due to migratory movements. However, little is known about helminth community structure of waterfowl at northern latitudes. We investigated the helminth communities of two avian herbivores that breed at high latitudes, Pacific black brant (Branta bernicla nigricans), and greater white-fronted geese (Anser albifrons), to examine effects of species, geographic area, age, and sex on helminth species richness, aggregation, prevalence, and intensity...
December 2016: International Journal for Parasitology. Parasites and Wildlife
Hugo Enrique Coutiño, Carlo de Asmundis, Giacomo Mugnai, Darragh Moran, Valentina De Regibus, Erwin Ströker, Ken Takarada, Diego Ruggiero, Rajin Choudhury, Stefan Beckers, Carla Van Gompel, Jan Poelaert, Saverio Iacopino, Pasquale Filannino, Pedro Brugada, Gian-Battista Chierchia
PURPOSE: Data indicate that the second-generation cryoballoon (Arctic Front Advance, Medtronic, Minnesota, USA) could be effective for persistent atrial fibrillation. However, electrophysiological findings and the midterm clinical outcome of repeat procedures following second-generation cryoballoon ablation are lacking. METHODS: Consecutive patients with drug-resistant persistent atrial fibrillation who underwent a repeat ablation due to arrhythmia recurrence following an index procedure with second-generation cryoballoon were retrospectively included in our analysis...
August 25, 2016: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
Ken Okumura, Kazuo Matsumoto, Yoshinori Kobayashi, Akihiko Nogami, Robert B Hokanson, Fred Kueffer
BACKGROUND: Outcomes of cryoballoon ablation for paroxysmal atrial fibrillation (PAF) have been reported in the Western countries but not in Japan. The CRYO-Japan PMS study was a single-arm, observational, multicenter, prospective study of the 2nd-generation cryoballoon Arctic Front Advance(TM). We evaluated device- and procedure-related complications and clinical outcomes at 6 months. METHODS AND RESULTS: The 616 patients (male, 72%; mean age, 63±11 years) were enrolled from 33 Japanese hospitals...
July 25, 2016: Circulation Journal: Official Journal of the Japanese Circulation Society
Victoria Shcherbakova, Yoshitaka Yoshimura, Yana Ryzhmanova, Yukihiro Taguchi, Takahiro Segawa, Victoria Oshurkova, Elizaveta Rivkina
In the present study, we used culture-independent methods to investigate the diversity of methanogenic archaea and their distribution in five permafrost samples collected from a borehole in the Kolyma River Lowland (north-east of Russia). Total DNA was extracted from methane-containing permafrost samples of different age and amplified by PCR. The resulting DNA fragments were cloned. Phylogenetic analysis of the sequences showed the presence of archaea in all studied samples; 60%-95% of sequences belonged to the Euryarchaeota...
October 2016: FEMS Microbiology Ecology
Mitch D Weegman, Stuart Bearhop, Geoff M Hilton, Alyn Walsh, Anthony David Fox
Variation in fitness between individuals in populations may be attributed to differing environmental conditions experienced among birth (or hatch) years (i.e., between cohorts). In this study, we tested whether cohort fitness could also be explained by environmental conditions experienced in years post-hatch, using 736 lifelong resighting histories of Greenland white-fronted geese (Anser albifrons flavirostris) marked in their first winter. Specifically, we tested whether variation in age at first successful reproduction, the size of the first successful brood and the proportion of successful breeders by cohort was explained by environmental conditions experienced on breeding areas in west Greenland during hatch year, those in adulthood prior to successful reproduction and those in the year of successful reproduction, using North Atlantic Oscillation indices as proxies for environmental conditions during these periods...
2016: PeerJ
Sergio Conti, Massimo Moltrasio, Gaetano Fassini, Fabrizio Tundo, Stefania Riva, Antonio Dello Russo, Michela Casella, Benedetta Majocchi, Vittoria Marino, Pasquale De Iuliis, Valentina Catto, Salvatore Pala, Claudio Tondo
Introduction. Cryoballoon (CB) ablation has emerged as a novel treatment for pulmonary vein isolation (PVI) for patients with paroxysmal atrial fibrillation (PAF). The second-generation Arctic Front Advance (ADV) was redesigned with technical modifications aiming at procedural and outcome improvements. We aimed to compare the efficacy of the two different technologies over a long-term follow-up. Methods. A total of 120 patients with PAF were enrolled. Sixty patients underwent PVI using the first-generation CB and 60 patients with the ADV catheter...
2016: Cardiology Research and Practice
Kunihiko Kiuchi, Koji Fukuzawa, Tomofumi Takaya, Tatsuya Nishii
A 56-year-old man with palpitation was referred to our hospital for catheter ablation due to drug refractory paroxysmal atrial fibrillation. Pulmonary vein isolation was attempted with the 28-mm cryoballoon (second-generation Arctic Front Advance(TM) , Medtronic). The left superior, right superior and right inferior pulmonary vein could be isolated by a single 3-minute freeze. This article is protected by copyright. All rights reserved.
March 30, 2016: Journal of Cardiovascular Electrophysiology
Mitch D Weegman, Stuart Bearhop, Geoff M Hilton, Alyn J Walsh, Kaitlin M Weegman, David J Hodgson, Anthony David Fox
Theory predicts persistence of long-term family relationships in vertebrates will occur until perceived fitness costs exceed benefits to either parents or offspring. We examined whether increased breeding probability and survival were associated with prolonged parent-offspring and sibling-sibling relationships in a long-lived Arctic migrant herbivore, the Greenland white-fronted goose (Anser albifrons flavirostris). Although offspring associated with parents for 1-13 years, 79 % of these associations lasted two or less years...
July 2016: Oecologia
Jason Andrade, Marc Dubuc, Laurent Macle
No abstract text is available yet for this article.
2016: Expert Review of Medical Devices
Z Khoueiry, J-P Albenque, R Providencia, S Combes, N Combes, F Jourda, P A Sousa, C Cardin, J-L Pasquie, T T Cung, F Massin, E Marijon, S Boveda
AIMS: Pulmonary vein isolation is the mainstay of treatment in catheter ablation of paroxysmal atrial fibrillation (AF). Cryoballoon ablation has been introduced more recently than radiofrequency ablation, the standard technique in most centres. Pulmonary veins frequently display anatomical variants, which may compromise the results of cryoballoon ablation. We aimed to evaluate the mid-term outcomes of cryoballoon ablation in an unselected population with paroxysmal AF from an anatomical viewpoint...
September 2016: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
Li Zhang, Changying Ruan, Fang Peng, Zixin Deng, Kui Hong
Actinomycete strain ZLN234T was isolated from a slushy soil sample, which was collected from glacier front of Arctic. Chemotaxonomic and morphological characteristics were found to be typical of members of the genus Streptomyces. The strain formed a distinct phyletic line in the 16S rRNA gene tree and to be closely associated with the type strains of Streptomyces olivochromogenes ATCC 3336T (98.63 %) and Streptomyces aureus B7319T (98.56 %). Phylogenetic analysis based on the gyrB gene also clearly showed that the strain ZLN234T was different from any discovered Streptomyces species...
January 19, 2016: International Journal of Systematic and Evolutionary Microbiology
Bhavi Pandya, Azfar Sheikh, Jonathan Spagnola, Soad Bekheit, James Lafferty, Marcin Kowalski
BACKGROUND: The newer second-generation cryoballoons (CB-2 or Arc-Adv-CB) have been shown to achieve significantly lower temperature and faster pulmonary vein isolation (PVI) time in comparison with first-generation cryoballoons (CB-1 or Arc-CB). To test the premise that second-generation cryoballoons can improve clinical outcomes in comparison to first-generation cryoballoons in terms of safety and efficacy, we pooled data for systemic review and meta-analyses from all available literature comparing their clinical performance...
January 2016: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
Cristina M Hansen, Brandt W Meixell, Caroline Van Hemert, Rebekah F Hare, Karsten Hueffer
To address the role of bacterial infection in hatching failure of wild geese, we monitored embryo development in a breeding population of Greater white-fronted geese (Anser albifrons) on the Arctic Coastal Plain of Alaska. During 2013, we observed mortality of normally developing embryos and collected 36 addled eggs for analysis. We also collected 17 infertile eggs for comparison. Using standard culture methods and gene sequencing to identify bacteria within collected eggs, we identified a potentially novel species of Neisseria in 33 eggs, Macrococcus caseolyticus in 6 eggs, and Streptococcus uberis and Rothia nasimurium in 4 eggs each...
August 15, 2015: Applied and Environmental Microbiology
Harald Greiss, Alexander Berkowitsch, Maciej Wojcik, Sergej Zaltsberg, Dimitri Pajitnev, Nikolas Deubner, Ersan Akkaya, Norbert Güttler, Christian Hamm, Thomas Neumann, Malte Kuniss
AIMS: In this observational study, we examine the significance of the left atrial (LA) surface area and compare the clinical usage of the Arctic Front Advance (CBA) versus Arctic Front (CB) cryoballoon with the intent to investigate the impact of each in terms of long-term freedom from atrial fibrillation (AF) for patients with nonvalvular AF. METHODS: Pulmonary vein isolation (PVI) was performed while using a cryoballoon ablation catheter in conjunction with an intraluminal circular diagnostic mapping catheter, Achieve...
July 2015: Pacing and Clinical Electrophysiology: PACE
Yukio Saitoh, Ghazala Irfan, Giuseppe Ciconte, Giacomo Mugnai, Juan Sieira, Giacomo Di Giovanni, Giannis Baltogiannis, Giulio Conte, Burak Hünük, Erwin Ströker, Vedran Velagić, Ingrid Overeinder, Carlo De Asmundis, Gian-Battista Chierchia, Pedro Brugada
BACKGROUND: Phrenic nerve palsy (PNP) is the most frequently observed complication in the setting of cryoballoon (CB) ablation (Arctic Front, Medtronic Inc., Minneapolis, MN, USA). Although, usually transient, resolving before the end of the procedure, persistent PNP (not resolving before the end of procedure) can occur. Literature on persistent PNP after second generation CB ablation is relatively sparse. METHODS: A total of 316 consecutive patients having undergone large 28-mm CB ablation as index procedure in the Heart Rhythm Management Center, UZ Brussels, Belgium, from January 2009 to December 2013 were retrospectively reviewed for the study...
July 2015: Pacing and Clinical Electrophysiology: PACE
Shinsuke Miyazaki, Jin Iwasawa, Akio Kuroi, Yoshito Iesaka
No abstract text is available yet for this article.
April 1, 2015: Journal of Cardiovascular Electrophysiology
Fabien Squara, Alexandre Zhao, Eloi Marijon, Decebal Gabriel Latcu, Rui Providencia, Giacomo Di Giovanni, Gaël Jauvert, Francois Jourda, Gian-Battista Chierchia, Carlo De Asmundis, Giuseppe Ciconte, Christine Alonso, Caroline Grimard, Serge Boveda, Bruno Cauchemez, Nadir Saoudi, Pedro Brugada, Jean-Paul Albenque, Olivier Thomas
AIMS: Whether pulmonary vein isolation (PVI) for paroxysmal atrial fibrillation (PAF) using contact force (CF)-guided radiofrequency (RF) or second-generation cryoballoon (CB) present similar efficacy and safety remains uncertain. METHODS AND RESULTS: We performed a multicentre study comparing procedural safety and arrhythmia recurrence after standardized PVI catheter ablation for PAF using CF-guided RF ablation (Thermocool(®) SmartTouch™, Biosense Webster; or Tacticath™, St Jude Medical) (CF group) with second-generation CB ablation (Arctic Front Advance™, Medtronic) (CB group)...
May 2015: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
Wilber Su, Robert Kowal, Marcin Kowalski, Andreas Metzner, J Thomas Svinarich, Kevin Wheelan, Paul Wang
BACKGROUND: Since the release of the second-generation cryoballoon (CB2; Arctic Front Advance(TM), Medtronic Inc) and its design modifications with improved cooling characteristics, the technique, dosing, and complication profile is significantly different from that of the first-generation cryoballoon. A comprehensive report of CB2 procedural recommendations has not been reported. OBJECTIVE: The purpose of this study was to review the current best practices from a group of experienced centers to create a user's consensus guide for CB2 ablation...
July 2015: Heart Rhythm: the Official Journal of the Heart Rhythm Society
Artur Baszko, Piotr Kałmucki, Rafał Dankowski, Magdalena Łanocha, Tomasz Siminiak, Andrzej Szyszka
AIMS: Inferior vena cava (IVC) interruption is a rare anatomic variant where the azygos vein (AV) drains the blood from the IVC to the upper part of the right atrium via the superior vena cava. Here, we report balloon cryoablation of the pulmonary veins (PVs) via superior access in a patient with atrial fibrillation. METHODS AND RESULTS: After the first failed ablation attempt due to IVC interruption, balloon cryoablation with a 28-mm Arctic Front Advance cryoballoon (Medtronic CryoCath LP, Quebec, Canada) via superior access was performed; it requires only a single transseptal puncture (TP), and the patient had optimal PV anatomy...
July 2015: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
Tan T Nguyen, Bjarne Landfald
Spatial variations in composition of marine microbial communities and its causes have largely been disclosed in studies comprising rather large environmental and spatial differences. In the present study, we explored if a moderate but temporally permanent climatic division within a contiguous arctic shelf seafloor was traceable in the diversity patterns of its bacterial and archaeal communities. Soft bottom sediment samples were collected at 10 geographical locations, spanning spatial distances of up to 640 km, transecting the oceanic polar front in the Barents Sea...
2015: Frontiers in Microbiology
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