1,720,957 research outputs found
A rare case of jugular foramen schwannoma arising from Jacobson’s nerve
No full textThe jugular foramen (JF) region is a complex area of the cranial base where venous structures such as the jugular bulb and the inferior petrosal sinuses are strictly related to the lower cranial nerves IX, X and XI. The most common tumours include glomus jugulare, schwannomas of the mixed cranial nerves (IX-XI) and meningiomas. Schwannomas involving the jugular foramen are rare neoplasms and in most of the cases are thought to originate from the X cranial nerve. We report a case of a schwannoma of the JF diagnosed at an early stage, allowing radiological and surgical evidence to support its origin from the tympanic branch of the IX cranial nerve. To our knowledge this is the first case reported in the literature of such a tumour
Endoscopic intraoperative control of epistaxis in nasal surgery
No full textOBJECTIVE:
Epistaxis represents a dangerous post-operative complication of nasal surgery. The advances of endoscopic procedures have also brought along the possibility of a surgical solution of nasal bleeding. These procedures include endoscopic cautery of the bleeding points, and more difficult techniques of endoscopic ligation of the sphenopalatine artery or the anterior ethmoidal artery. These surgical methods permit avoiding nasal packing, a very annoying procedure for the patient. This study aims to evaluate the advantages of this approach at the end of a nasal surgery to prevent routine nasal packing.
METHOD:
133 subjects were operated on by the same surgeon in the Otorhinolaringology Department of University of Foggia (Italy) from March 2006 to March 2007. 17 (12.8%) patients were submitted to septoplasty, 42 (31.5%) to turbinoplasty (in 22 accompanied by septoplasty) and 74 (55.6%) to endoscopic sinus surgery (ESS) for nasal polyposis or nasal tumors.
RESULTS:
Only 16 cases (12%) underwent nasal packing, while in the remaining 117 (88%) endoscopic control of bleeding permitted avoiding packing. In 53 (39.8%) patients only an endoscopic cauterization of bleeding points was performed; in 29 (21.8%) cases a sphenopalatine artery ligation was necessary. Only 2 subjects (1.5%) underwent anterior ethmoidal artery ligation. In the remaining 34 (25.5%) patients no procedure was necessary, due to the apparently scarce bleeding in the endoscopic vision at the end of surgery. In this group of non-packed patients, only 8 (6.8%) needed a post-operative tamponade while in the group of packed patients, 2 (12.5%) cases had a re-bleeding and a revisional surgery was necessary.
CONCLUSION:
Intra-operative precautional packing is therefore not justified during nasal surgery because of the small percentage of post-operative epistaxis. Intra-operative control of bleeding allowed nasal packing to be avoided in a large percentage of cases
Restoration of nasal cytology after endoscopic turbinoplasty versus laser-assisted turbinoplasty.
No full textBackground: Insult from surgical trauma leads to a degeneration of the nasal epithelium, resulting in morphological–volumetric changes involving the entire cell or a specific cell component. Alterations in normal nasal mucosa were assessed by nasal cytology and other functional tests after either endoscopic turbinoplasty or laser-assisted turbinoplasty for reducing inferior turbinate enlargement.
Methods: A total of 150 patients with chronic nasal obstruction due to inferior turbinate hypertrophy were randomly assigned to undergo laser-assisted turbinoplasty or endoscopic turbinoplasty. Preoperative and postoperative assessment at 1 and 3 months follow-up included active anterior rhinomanometry, measurement of mucociliary transport time (MCTt), and nasal cytology to determine whether improved nasal breathing was accompanied by a restoration of
preoperative nasal cytology and MCTt. One year after the operation, nasal cytology was repeated to definitively evaluate the presence of surgery-related cytological damage.
Results: At both postoperative visits, nasal resistance had decreased similarly in both treatment groups; mean MCTt was significantly shorter in the endoscopic turbinoplasty-treated group (p 0.05); at both visits, the number of altered ciliated cells had increased in the laser-assisted turbinoplasty-treated group but decreased in the endoscopic turbinoplasty-treated group, which, unlike the laser-assisted turbinoplasty-treated group, was also noted to have progressed toward a significant improvement in the goblet-to-ciliated cell ratio (p 0.01).
Conclusion: When compared with laser-assisted turbinoplasty, endoscopic turbinoplasty is a conservative technique for inferior turbinate reduction that allows better restoration of preoperative nasal cytology and shorter MCTt
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
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