1,721,049 research outputs found
Dehiscence of the superior semicircular canal: A review of the literature on its possible pathogenic explanations
No full textThe dehiscence of superior semicircular canal is a well-known affection which is able to explain some cases of hearing loss, tinnitus and/or vertigo unexpectedly presenting in adults without previous otologic affections. Although a diagnostic algorithm has been assessed and a surgical therapy has been indicated, the review of the literature shows that a completely satisfactory explanation for the reason why symptoms of a supposed congenital condition only occur in adulthood is still lacking. A pathogenic hypothesis based on the slow metabolism of the bony labyrinth, which could in time result in a prevalence of bone re-absorption on new bone formation leading to a dehiscence, despite some controversial findings could represent a the most reliable explanation for the question
Superior canal dehiscence and ‘near-dehiscence’ syndrome: clinical and instrumental aspects.
No full textEven though superior canal dehiscence syndrome (SCDS) has already been
widely studied from a clinical, etiopathogenetic and therapeutic point of view,
some diagnostic aspects have yet to be clarified. It is well-known that highresolution
CT (HRCT) scan tends to overestimate the prevalence of the bony
defect requiring the detection of lowered thresholds of air-conducted (AC) VEMPs
to confirm the diagnostic suspect. The most recent definition of the so-called
near-dehiscence syndrome (NDS), in which an extremely thinned bony roof of
the superior canal results in the onset of a symptomatological scenario overlapping
SCDS, has allowed to explain most cases of incongruence between imaging
analyses and electrophysiological data. Moreover, no univocal explanation to
the wide symptomatological and semeiological variability of SCDS has been
offered yet. The aim of this paper is to face the diagnostic dilemma offered by
the complexity of this two-fold syndrome (SCDS vs NDS) reviewing the clinical
and instrumental data and submitting to statistical analyses a subsample of
100 patients (193 ears) selected from a group of 242 patients (114 M, 128 F,
mean age 56.8 y, range 8-88 y) showing a dehiscence or a an extreme thinning
of the superior canal at least from one side at HRCT scans. Firstly, we
verified the effectiveness and the diagnostic accuracy of imaging in confirming
electrophysiological data, considering the threshold lowering of AC cervical
VEMPs as the gold standard in diagnosing an increased inner-ear admittance
due to SCD and we offered physiopathogenetic explanation for those cases of
incongruence between results. Secondly, we sought among instrumental set (AC
and BC cervical and ocular VEMPs, video head impulse test) the test allowing
the best diagnostic criteria for ‘near dehiscence’ and the parameter correlating
most significantly with the size of dehiscence in case of SCDS. While mostly
all data collected can reliably differentiate SCDS from NDS, from this study
emerges that ocular VEMPs represent an effective method to detect the ‘neardehiscent’
condition among the normal cases
The treatment of superior semicircular canal dehiscence: A review of the literature about a not completely clarified problem
No full textObjective: This paper reviews the principal surgical strategies proposed in the literature in approaching the Superior Semicircular Canal Dehiscence (SSCD) syndrome. It examines the controversies regarding each treatment modality including surgical indications, procedures and the main outcomes. Design: A systematic literature research was conducted using a number of resources including electronic databases, books and websites. Relevant citations from current publications were also followed up. Results: Two principal types of surgical procedure for the treatment of superior canal dehiscence were identified: canal plugging and resurfacing. Each can be performed by both a middle cranial fossa (MCF) and transmastoid (TM) approach. An alternative and less invasive option to treat this pathological condition, without repairing the underlying lesion, has recently emerged from the literature: the round window (RW) niche reinforcement through a transmeatal approach. Conclusions: All the reported techniques represent reliable and effective solutions in cases of intolerable symptoms; nevertheless, the controversies still present about the pathophysiological changes linked to dehiscence reflect the difficulties in proposing a universal method of treatment. It is, therefore, probable that a more prolonged knowledge of this affection is necessary to fully understand all its implications. © 2014 Informa Healthcare
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
La chirurgia dell’orecchio interno: il trattamento della fistola perilinfatica post-traumatica.
No full text
La riabilitazione delle Vestibolopatie Periferiche.
No full textNel corso della relazione vengono indicate le nuove metodiche semeiologiche per il riconoscimento delle principali malattie del sistema vestibolare e per il trattamento riabilitativo delle stesse con particolare riguardo alla labirintolitiasi
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