Publications by authors named "Freyss G"

The authors treated 22 patients with intratympanic gentamicin. Vestibular function was measured using caloric and head impulse tests and vestibular evoked myogenic potentials induced by high amplitude sounds and short duration galvanic currents. Roughly one-third of the patients, after initially losing their caloric responses and displaying refixation saccades to head impulse tests, recovered within 2 years of the lesion.

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After facial nerve injury, in cerebello-pontine tumors surgery, hypoglossal-facial anastomosis is the most common procedure, to rehabilite a paralysed face, if direct facio-facial graft is not possible. This procedure must be done, in a second time, during the next year and followed with a specific reeducation. In seven patients operated between 1985 and 1996, we performed clinical evaluation and electrophysiological examination.

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Objective: The aim of this study was to assess any dysfunction of the sacculus in patients with unilateral Meniere's disease by monitoring the vestibular evoked myogenic potentials (VEMPs) evoked by high level clicks on the Stemomastoid muscles (SCMs).

Study Design: The study was a retrospective analysis.

Setting: The study was performed in the E.

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Vestibular function of a population including labyrinthine-defective patients and a control group of age-matched normal healthy volunteers was evaluated using videonystagmoscopy. This device is made of one or two CCD infra-red cameras mounted on diving glasses and allows observation of ocular movements on a video monitor and/or recording on a videotape. Eye movements are observed after rotations in a Bárány chair and during passive head tilts.

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Previous studies have shown the vulnerability of the vestibular system regarding barotraumatism (1) and deep diving may induce immediate neurological changes (2). These extreme conditions (high pressure, limited examination time, restricted space, hydrogen-oxygen mixture, communication difficulties etc.) require adapted technology and associated fast experimental procedure.

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Objectives: Apparent a frigore facial palsy could possibly mask manifestations of unrecognized Lyme's disease. Since commonly used corticosteroid treatment could be deleterious if Borrelia burgdorferi infection was indeed the cause, we conducted a prospective study to search for possible infections in cases of recently diagnosed a frigore facial palsy.

Methods: For 3 years, 1990-1992, 49 French centres diagnosed a facial palsy in 346 patients (310 adults, 36 children under 15 years of age; mean age 38; range 16 months to 83 years).

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Any case of vertigo and equilibrium disorder for which an origin is not rapidly determined requires exploration for diagnosis. This exploration comprises two parts: first, that of peripheral components, including a standard audiometric examination, completed by study of the evoked auditory potentials. This is followed by vestibular examination comprising at least caloric tests of both ears, usually associated with rotation tests; second, exploration of the central pathways, by electro-oculography, study of pursuit and saccadic movements.

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Static and dynamic equilibrium (posture and gait) is indispensable for a normal behavior in human. Its mechanisms are nearly the same in superior species and in man, but humans are the only ones to have acquired exclusively biped upright position and gait. Equilibrium is a sensory function involving 3 sub systems: visual, vestibular and sensori-motor (proprioceptive), controlled by cerebellum and cerebral structures.

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Equilibrium is based on gaze stabilization. Clinical examinations currently test, individually the three components involved in equilibrium: vestibular, visual and proprioception. New investigations are being developed to test equilibrium dynamic conditions.

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The temporal branches of the facial nerve, and in particular the rami for the frontalis muscle, have been the subject of many studies with the main objective of avoiding injury. The usual reference points, sometimes difficult to localise, anatomical variations in their branching and anastomoses are the main points of our investigation. This anatomical dissection study of 30 cadavres, with easy reference points available both superficially and in the depths allow a simple, non complicated localisation of the frontal branch and its anastomosis in a precise way on the mandibular condyle, the zygomatic arch and the temporal region.

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The authors experience on twelve patients in the field of bone grafting prior to implant surgery is presented. The technique employed depends largely on the anatomical location of bone insufficiency, such as: 1) Where there is not enough bone beneath sinus locations, grafting with cancellous iliac bone blended with coral particles is suggested. 2) Where the jaw is not sufficiently thick, such as in the incisor-cuspid regions, the authors employ cancellous and/or cortical bone grafts.

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Surgery for acoustic neuroma is highly risky for the facial nerve. This is why we have tried to assess immediate postoperative facial impairment by performing Hilger's test within the first few hours. Further evolution of the facial function showed the predictive value of Hilger's test as regards facial recovery.

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The authors carry out a retrospective study of the diagnostic procedures used in a series of 50 acoustic neuromas. AEP were performed for thirty-four neuromas at some stage of their history. The findings were perfectly normal for eight of them, which represents a sensitivity level of 76%.

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Vestibular compensation is an excellent model for the study of plasticity of the adult central nervous system. Therefore it has been the subject of several studies in humans and animals, which will be briefly summed up by the authors. Lesions of the labyrinth or vestibular neurectomy are immediately followed of postural and oculomotor disorders, as well as by dynamic deficits of the various vestibular reflexes (vestibulo-ocular and vestibulonucal reflexes).

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Main features of the benign paroxysmal positional vertigo (B.P.P.

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Anatomical and functional results were evaluated at 3 and 5 years after surgery for chronic cholesteatomatous otitis media in 94 patients treated by the same surgeon between 1975 and 1983. Open techniques predominated and were justified by seven clinical or epidemiologic factors present alone or in association in 80% of cases. Many patients were non-attenders at follow up (40% at 3 years and 70% at 5 years), recovery from their cholesteatoma being noted in 84% and 78% of those attending at 3 and 5 years respectively.

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Anatomic and functional results are reported after 3 and 5 year follow up of 94 cases of chronic cholesteatomatous otitis operated upon and kept under surveillance by the same surgeon between 1975 and 1983. Open technics dominated and were justified by seven clinical and epidemiologic factors found alone or in combination in 80% of patients. Results must allow for the high rate of non-attenders (40% at 3 years and 70% at 5 years).

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