1,720,977 research outputs found
Inner ear impairment after stapedotomy. do the cervical vestibular evoked myogenic potentials play a diagnostic role?
No full textBackground Otosclerosis is characterized by a bony remodeling process that ends up with stapes fixation. The hearing impairment can be recovered by surgery by replacing the stapes superstructure. Due to the surgical management of the vestibule, the vestibular examination could provide an insight into the correlation between this kind of surgery and vestibular changes. Objectives To evaluate the impact of the stapedotomy on the inner ear. Methods We evaluated pure tone audiometry and the presence of vestibular evoked myogenic potentials (VEMPs) in 41 patients with otosclerosis before and after the stapedotomy operation. Results Air conduction (Ac)-VEMPs were present in 18 cases preoperatively and 31 cases postoperatively. Bone conduction (Bc)-VEMPs were present in 23 cases preoperatively and 33 cases postoperatively. ABG was closed to less than 20 dB in all cases after the operation Conclusions The preoperative Bc-VEMPS had an outstanding capability to predict the type of hearing loss. The postoperative absence of VEMPS despite the closure of ABG indicated the impact of otosclerosis on the saccular cells. The use of Thulium Laser in stapedotomy didn't affect significantly the saccular cells. Significance Integrated use of audiometry and VEMPs was effective to evaluate the changes associated with otosclerosis and the stapedotomy operation
Proposal of a magnetic resonance imaging follow-up protocol after cholesteatoma surgery: a prospective study
No full textBackground: Non-echo planar (EPI) diffusion-weighted (DW) MRI has become an effective tool for the follow-up after cholesteatoma surgery and decreased the rate of second-look surgeries. Objectives: To shed light on the optimal imaging follow-up protocol to detect postoperative residual or recurrent cholesteatoma. Materials and methods: 64 patients were included in this prospective study. Three different surgical procedures were considered: canal-wall-up (26 patients), canal-wall-down (20 patients), and obliterative (18 patients). The imaging follow-up protocol included non-EPI DW MRI during the following postoperative periods: 1 month, 6 months, and 1, 3, 5, and 7 years after the primary surgery. Results: MRI-positive lesions were present in 18.75% of patients. 50% of the MRI-positive findings occurred at the 1-month follow-up. The other peak of MRI positivity occurred at the 3-year follow-up. The last MRI-positive finding appeared at the 5-year follow-up. Conclusions: The timing for the imaging protocol proposed by this prospective study to detect recidivism after cholesteatoma surgery stressed the importance of performing non-EPI DW MRI for detecting residual, though rare, disease. Likewise, extending the follow-up to a least 5 years after primary surgery was also recommended to detect any recurrent cholesteatoma that would appear unlikely to be present beyond this time se
A case of cavernous hemangioma of the infratemporal fossa causing recurrent secretory otitis media
Full text linkSecretory otitis media causes aural fullness and hearing loss secondary to Eustachian tube obstruction or incomplete resolution of acute otitis media. Every patient with unilateral middle ear effusion should undergo nasopharyngoscopy to assess the nasopharyngeal space. Expansive lesions at the level of pterygopalatine fossa may cause Eustachian tube compression with tube dysfunction with clinical findings of recurrent unilateral secretory otitis media. In this paper, a 55 years old man presented with a history of hearing loss and fullness in the left ear. Brain MRI scan showed the presence on the left side of a solid mass in the infratemporal masticatory space and the patient underwent endoscopic transnasal resection of the lesion. At 6 months follow-up there was no evidence of disease recurrency. In our opinion, it is important to add an imaging tool to the diagnostic algorithm in all those cases of secretory otitis media lasting more than 3 months that present a negative nasopharyngoscopy evaluation
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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