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https://www.readbyqxmd.com/read/28706589/catheter-ablation-of-atrial-fibrillation-facilitated-by-preprocedural-three-dimensional-transesophageal-echocardiography-long-term-outcome
#1
Klaus Kettering, Felix Gramley, Stephan von Bardeleben
AIM: To evaluate the long-term outcome of catheter ablation of atrial fibrillation (AF) facilitated by preprocedural three-dimensional (3-D) transesophageal echocardiography. METHODS: In 50 patients, 3D transesophageal echocardiography (3D TEE) was performed immediately prior to an ablation procedure (paroxysmal AF: 30 patients, persistent AF: 20 patients). The images were available throughout the ablation procedure. Two different ablation strategies were used. In most of the patients with paroxysmal AF, the cryoablation technique was used (Arctic Front Balloon, CryoCath Technologies/Medtronic; group A2)...
June 26, 2017: World Journal of Cardiology
https://www.readbyqxmd.com/read/28573498/single-freeze-strategy-with-the-second-generation-cryballoon-for-atrial-fibrillation-a-multicenter-international-retrospective-analysis-in-a-large-cohort-of-patients
#2
Valentina De Regibus, Saverio Iacopino, Juan Pablo Abugattas, Hugo Enrique Coutiño, Giacomo Mugnai, Cesare Storti, Giulio Conte, Angelo Auricchio, Darragh Moran, Erwin Ströker, Luis Marroquin, Ken Takarada, Rajin Choudhury, Carlo de Asmundis, Pedro Brugada, Gian-Battista Chierchia
PURPOSE: The second-generation cryoballoon (CB-A, Arctic Front Advance, Medtronic, Minneapolis, MN, USA) has proven to be highly effective in achieving freedom from atrial fibrillation; nonetheless, the ideal number and duration of freezing cycles is still a matter of debate. We investigated the acute success, procedural complications, and clinical outcome of a single freeze strategy using the CB-A in a large, retrospective, international multicenter study. METHODS: Between January 2013 and September 2015, 818 consecutive patients (58 ± 12 years, 68% males) with drug-resistant atrial fibrillation (AF) who underwent a CB-A using a single freeze strategy were taken into consideration for our analysis...
June 1, 2017: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/28547813/salix-arctica-changes-root-distribution-and-nutrient-uptake-in-response-to-subsurface-nutrients-in-high-arctic-deserts
#3
Amanda L Guy, Sarah P Hardy, Steven D Mamet, Mitsuaki Ota, Eric G Lamb, Steven D Siciliano
Moisture is critical for plant success in polar deserts but not by the obvious pathway of reduced water stress. We hypothesized that an indirect, nutrient-linked, pathway resulting from unique water/frozen soil interactions in polar deserts creates nutrient-rich patches critical for plant growth. These nutrient-rich patches (diapirs) form deep in high arctic polar deserts soils from water accumulating at the permafrost freezing front and ultimately rising into the upper soil horizons through cryoturbated convective landforms (frost boils)...
May 26, 2017: Ecology
https://www.readbyqxmd.com/read/28416971/a-multicenter-study-of-the-need-of-additional-freezing-for-cryoballoon-ablation-in-patients-with-atrial-fibrillation-the-ad-balloon-study
#4
Koji Miyamoto, Atsushi Doi, Naoki Amaya, Yoshiaki Morita, Takashi Noda, Masanori Asakura, Toshimitsu Hamasaki, Hiroshi Tada, Masahiko Takagi, Satoshi Yasuda, Kengo Kusano
BACKGROUND: Pulmonary vein isolation (PVI) is a cornerstone of catheter ablation in patients with paroxysmal atrial fibrillation (PAF), and balloon-based ablation has been recently performed worldwide. Ablation using the second-generation cryoballoon (CB2) (Arctic Front Advance(TM), Medtronic, MN, USA) is useful for PVI; however, there is some debate concerning the optimal freezing time and number of cycles after PVI is achieved. METHODS: The AD-Balloon study was designed as a prospective, multicenter, randomized clinical trial to evaluate the optimal strategy (freezing cycles) of CB2 ablation (UMIN Clinical Trials Registry UMIN000020130)...
April 2017: Journal of Arrhythmia
https://www.readbyqxmd.com/read/28415134/an-arctic-predator-prey-system-in-flux-climate-change-impacts-on-coastal-space-use-by-polar-bears-and-ringed-seals
#5
Charmain D Hamilton, Kit M Kovacs, Rolf A Ims, Jon Aars, Christian Lydersen
Climate change is impacting different species at different rates, leading to alterations in biological interactions with ramifications for wider ecosystem functioning. Understanding these alterations can help improve predictive capacity and inform management efforts designed to mitigate against negative impacts. We investigated how the movement and space use patterns of polar bears (Ursus maritimus) in coastal areas in Svalbard, Norway, have been altered by a sudden decline in sea ice that occurred in 2006...
April 17, 2017: Journal of Animal Ecology
https://www.readbyqxmd.com/read/28243805/radiofrequency-catheter-ablation-for-redo-procedures-after-pulmonary-vein-isolation-with-the-cryoballoon-technique-long-term-outcome
#6
Klaus Kettering, Felix Gramley
BACKGROUND: Catheter ablation has become the first line of therapy in patients with symptomatic, recurrent, drug-refractory atrial fibrillation (AF). Cryoablation has been shown to be a safe and effective technique for pulmonary vein (PV) isolation. However, the arrhythmia recurrence rate is high after cryoablation procedures. Radiofrequency catheter ablation has been shown to be an effective strategy for redo procedures in these patients and to provide a favourable outcome during midterm follow-up...
February 27, 2017: Herzschrittmachertherapie & Elektrophysiologie
https://www.readbyqxmd.com/read/28243592/loop-recorder-detected-high-rate-of-atrial-fibrillation-recurrence-after-a-single-balloon-or-basket-based-ablation-of-paroxysmal-atrial-fibrillation-results-of-the-macpaf-study
#7
Alexander Schirdewan, Juliane Herm, Mattias Roser, Ulf Landmesser, Matthias Endres, Lydia Koch, Karl Georg Haeusler
PURPOSE: Pulmonary vein isolation (PVI) is an established approach to treat symptomatic non-permanent atrial fibrillation (AF). Detecting AF recurrence after PVI is important, if discontinuation of oral anticoagulation after ablation is considered. METHODS: Patients with symptomatic paroxysmal AF were enrolled in the prospective randomized mesh ablator vs. cryoballoon pulmonary vein (PV) ablation of symptomatic paroxysmal AF study, comparing efficacy and safety of the HD Mesh Ablator(®) (C...
2017: Frontiers in Cardiovascular Medicine
https://www.readbyqxmd.com/read/28056218/neisseria-arctica-sp-nov-isolated-from-nonviable-eggs-of-greater-white-fronted-geese-anser-albifrons-in-arctic-alaska
#8
Cristina M Hansen, Elizabeth A Himschoot, Rebekah F Hare, Brandt W Meixell, Caroline Van Hemert, Karsten Hueffer
During the summers of 2013 and 2014, isolates of a novel Gram-stain-negative coccus in the genus Neisseriawere obtained from the contents of nonviable greater white-fronted goose (Anseralbifrons) eggs on the Arctic Coastal Plain of Alaska. We used a polyphasic approach to determine whether these isolates represent a novel species. 16S rRNA gene sequences, 23S rRNA gene sequences, and chaperonin 60 gene sequences suggested that these Alaskan isolates are members of a distinct species that is most closely related to Neisseria canis, Neisseriaanimaloris and Neisseriashayeganii...
May 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/27829694/climigration-population-and-climate-change-in-arctic-alaska
#9
Lawrence C Hamilton, Kei Saito, Philip A Loring, Richard B Lammers, Henry P Huntington
Residents of towns and villages in Arctic Alaska live on "the front line of climate change." Some communities face immediate threats from erosion and flooding associated with thawing permafrost, increasing river flows, and reduced sea ice protection of shorelines. The term climigration, referring to migration caused by climate change, originally was coined for these places. Although initial applications emphasized the need for government relocation policies, it has elsewhere been applied more broadly to encompass unplanned migration as well...
2016: Population and Environment
https://www.readbyqxmd.com/read/27784729/use-of-glacial-fronts-by-narwhals-monodon-monoceros-in-west-greenland
#10
Kristin L Laidre, Twila Moon, Donna D W Hauser, Richard McGovern, Mads Peter Heide-Jørgensen, Rune Dietz, Ben Hudson
Glacial fronts are important summer habitat for narwhals (Monodon monoceros); however, no studies have quantified which glacial properties attract whales. We investigated the importance of glacial habitats using telemetry data from n = 15 whales tagged in September of 1993, 1994, 2006 and 2007 in Melville Bay, West Greenland. For 41 marine-terminating glaciers, we estimated (i) narwhal presence/absence, (ii) number of 24 h periods spent at glaciers and (iii) the fraction of narwhals that visited each glacier (at 5, 7 and 10 km) in autumn...
October 2016: Biology Letters
https://www.readbyqxmd.com/read/27709067/helminth-community-structure-in-two-species-of-arctic-breeding-waterfowl
#11
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
https://www.readbyqxmd.com/read/27562140/repeat-procedures-after-second-generation-cryoballoon-ablation-as-an-index-procedure-for-persistent-atrial-fibrillation-one-year-follow-up
#12
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...
December 2016: Journal of Interventional Cardiac Electrophysiology: An International Journal of Arrhythmias and Pacing
https://www.readbyqxmd.com/read/27357333/safety-and-efficacy-of-cryoballoon-ablation-for-paroxysmal-atrial-fibrillation-in-japan%C3%A3-results-from-the-japanese-prospective-post-market-surveillance-study
#13
MULTICENTER STUDY
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
https://www.readbyqxmd.com/read/27312964/archaeal-communities-of-arctic-methane-containing-permafrost
#14
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
https://www.readbyqxmd.com/read/27257539/conditions-during-adulthood-affect-cohort-specific-reproductive-success-in-an-arctic-nesting-goose-population
#15
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
https://www.readbyqxmd.com/read/27069711/comparison-between-first-and-second-generation-cryoballoon-for-paroxysmal-atrial-fibrillation-ablation
#16
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
https://www.readbyqxmd.com/read/27027797/homogenous-and-continuous-lesion-formation-with-cryoballoon-ablation-delayed-enhancement-magnetic-resonance-imaging-analysis
#17
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
https://www.readbyqxmd.com/read/26995680/should-i-stay-or-should-i-go-fitness-costs-and-benefits-of-prolonged-parent-offspring-and-sibling-sibling-associations-in-an-arctic-nesting-goose-population
#18
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
https://www.readbyqxmd.com/read/26878100/a-critical-evaluation-of-second-generation-af-ablation-technologies-cryoballoons-and-contact-forces
#19
EDITORIAL
Jason Andrade, Marc Dubuc, Laurent Macle
No abstract text is available yet for this article.
2016: Expert Review of Medical Devices
https://www.readbyqxmd.com/read/26817755/outcomes-after-cryoablation-vs-radiofrequency-in-patients-with-paroxysmal-atrial-fibrillation-impact-of-pulmonary-veins-anatomy
#20
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
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