1,720,957 research outputs found
Paroxysmal atrial fibrillation ablation with the mutlipolar mapping and ablation catheter
No full textPulmonary veins (PVs) ablation is a valid treatment option for atrial fibrillation. The standard approach
for PVs isolation usually requires two catheters or an electroanatomical reconstruction of the left atrium.
We describe our initial experience with a single device for mapping and ablating in a patient referred to our
center for the relapsing of atrial fibrillation 3 years after a previous ablation procedure. The newly available
catheter MESH was safe and effective to quickly isolate two reconnected.
Introduction
Ablation within or around the pulmonary
veins (PVs) is a valid treatment option for atrial fibrillation.
Usually PVs isolation requires the combined
use of a multielectrode catheter for mapping
together with an ablation catheter. Alternatively
a point-by-point mapping and ablation can be
achieved using a three-dimensional nonfluoroscopic
system.1–7
We describe the case of a patient with recurrent
paroxysmal atrial fibrillation subjected to PVs
ablation by using a newly available device that allows
to map and ablate simultaneously with the
same catheter
Contact versus Noncontact Mapping for Ablation of Ventricular Tachycardia in Patients with Previous Myocardial Infarction
No full textIntroduction: The aim of this study was to compare contact versus noncontact mapping for radiofrequency
(RF) ablation of any sustained post-myocardial infarction (MI) ventricular tachycardia (VT).
Methods: Forty patients with tolerated VT post-MI were randomized to RF ablation with contact (group
1) or noncontact (group 2) mapping systems. In both groups ablation of tolerated VT was guided by VT
activation map confirmed by concealed entrainment. When untolerated VTs were induced, ablation was
performed in group 1 according to pace mapping starting from the scar border zone and in group 2
according to the VT activation map confirmed by pace mapping.
Results: No differences were seen between the groups in terms of acute success rate of clinical VT
ablation (95% vs 100%, respectively; P = ns) and in the noninducibility of any VT at the end of the
procedure (55% vs 85%, respectively; P = 0.08). Moreover, untolerated VTs were eliminated in 30% of
group 1 versus 83.3% of group 2 patients (P < 0.05). The mean total procedural and fluoroscopy times
were 236.4 ± 42.7 and 29.0 ± 7.8 minutes in group 1 and 144.5 ± 50.8 and 23.4 ± 5.8 minutes in group
2 (P < 0.001 and < 0.05, respectively). At a mean follow-up of 15.2 ± 6.7 months no differences were
seen in VT recurrences between groups, but noninducibility at the end of the procedure was predictive of
freedom from recurrences (P < 0.001).
Conclusion: Both systems are useful for ablation of tolerated VT. Noncontact mapping is more effective
for ablation of untolerated VT and allows the reduction of procedural and fluoroscopy times. Noninducibility
at the end of the procedure seems predictive of freedom from recurrences during follow-up
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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