1,720,958 research outputs found
Thoracoscopic resection of mediastinal bronchogenic cysts in adults
No full textObjective: Bronchogenic cysts are uncommon congenital anomalies of foregut origin usually located within the mediastinum and the lung and rarely diagnosed in adults. Surgical excision is recommended to establish diagnosis based on histologic examination, alleviate symptoms if present, and prevent future complications. Thoracoscopic approach is becoming the primary therapeutic option. Methods: Between January 1995 and July 2008, 30 patients with mediastinal bronchogenic cyst (MBC) underwent thoracoscopic operation (19 mate, 11 female with a mean age of 39 years, range 19-59 years). Symptoms were present in 11 patients (37). Results: The cysts averaged 5.2 cm in their greatest diameter (range 3-10.5 cm). In two cases thoracoscopy was converted to thoracotomy because of major pleural adhesions. There were no operative deaths and no intra-operative complications. Postoperative course was uneventful in all cases and the 28 patients who underwent thoracoscopy were discharged after a mean of 3.7 days (range 2-5 days). Conclusions: Considering the low conversion and complication rate, thoracoscopic excision of bronchogenic mediastinal cyst should be considered the primary therapeutic option. (C) 2009 European Association for Cardio-Thoracic Surgery. Published by Elsevier B.V. All rights reserved
Magnetic resonance-fluoroscopy as long-term follow-up examination in patients with narrow gastric tube reconstruction after radical esophagectomy
No full textObjective: To evaluate the functionality and morphology of neo-esophagus in subjects who underwent narrow gastric tube (NGT) reconstruction after total esophagectomy using magnetic resonance (MR)-fluoroscopy with Turbo-FLASH sequences acquired during positive oral contrast agent administration. Methods and materials: Ten patients, who underwent NGT reconstruction after total esophagectomy between 2002 and 2004, were studied using a 1.5 T magnet (Magnetom Avanto: Siemens, Erlangen, Germany, featuring total imaging matrix-TIM (R) technology), equipped with surface phased-array and integrated spine coils. Imaging protocol included TRUFI and Turbo-FLASH sequences (TR = 600 ms; TE = 1.3 ms; Flip Angle 8 degrees; Thickness 20 mm; FoV 350; Matrix 128 x 256; N. acquisition 120; TA = 50 s) acquired on sagittal. and axial planes to achieve motility evaluation during oral administration of positive contrast agent (yoghurt + Gd-DTPA 0.5 M, 1:100 boluses). Results: Good quality images were obtained in all patients, with adequate lumen contrast and a frame rate of 2.5 frames per second (fps). Three patients had completely re-established motility of NGT, six patients had mild to moderate alterations including raised transit time, reflux and contrast agent stasis; one patient had severe alterations with grossly dilated NGT, severe reflux and stasis. Conclusions: MR-fluoroscopy approach represents a promising radiation-free modality in the evaluation of functionality and morphology of NGT Further investigation in the evaluation of post-surgery patients is necessary. (c) 2006 Elsevier B.V. All rights reserved
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
Cystic fibrosis and the thoracic surgeon
No full textIndications for thoracic surgery in patients with cystic fibrosis (CF) are principally represented by pleural diseases including pneumothorax, pleural effusion, and empyema and by parenchymal lung diseases including bronchiectasis, hemoptysis, and pulmonary abscess. Moreover, lung transplantation has proved a viable therapeutic option for progressive respiratory failure due to end-stage CF. Main surgical experiences in this setting are reviewed and discussed. (C) 2010 European Association for Cardio-Thoracic Surgery. Published by Elsevier B. V. All rights reserved
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
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