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Biomedical subjects

G Freyss

Publications and source records attributed to G Freyss.

At least 55 records · Page 3Linked to original sources
PubMed1981

[Comparative values of unilateral and bilateral caloric bithermal vestibular tests in the diagnosis of acoustic neurinoma (author's transl)].

Acoustic neurinomas must be diagnosed as early as possible for the tumour to be removed while it is still small and the facial and, sometimes, auditory functions to be preserved. Since 89% of neurinomas lie on the vestibular nerve, enhancing the sensitivity of test exploring this nerve is important. Bilateral bithermal caloric stimulation is more sensitive (85%) than unilateral stimulation (71%) in detecting functional impairment. By comparing the two examinations in a series of 28 patients the authors have demonstrated that the test is more sensitive and reliable when bilateral and unilateral stimulation are practised successively. A study of correlations between these tests and the volume of the neurinoma showed that while functional impairment generally increases with the size of the tumour, it may vary from nil to 100% in small neurinomas. However, the sensitivity of the caloric test remains inferior to that of more sophisticated audiometric techniques, such as BERA-recording of stapedial reflex.

Adolescent↗
PubMed1980

[Audiovestibular instrumental exploration of the brain stem (part 2) (author's transl)].

The authors review the physiology and anatomical pathways of the three types of ocular version movements: saccadic movements, slow visual pursuit movements, slow vestibulo-ocular movements. They carefully describe the techniques of oculographic exploration of these three types of movements, their normal results, the possible artefacts and pathological results during involvement of the brain stem and associated structure. They demonstrate the value of using a technique of stimulation with recorded parameters, and a technique of analogous automatic analysis in real time of the results (Nystagmolab of Greiner, Conraux, Max).

Auditory Pathways↗
PubMed1980

[The value of fibroscopy in laryngotracheal stenosis (author's transl)].

The authors report the results of 297 fibroscopies in 69 patients suffering from laryngotracheal stenosis. These examinations were carried out either before treatment or for follow-up purposes. The majority of patients had undergone respiratory intensive therapy. The underlying reason for this intensive therapy was analysed, as well as the techniques used : intubation 26 %, tracheotomy 33,5 %, intubation followed by tracheotomy 40 %. Results of fibroscopy before treatment (111) are described, emphasizing the fact that this fibroscopy was adequate in the great majority of cases (96 %) to reach a decision as to wether surgery was necessary or not, and this even though certain patients had suffered severe respiratory failure. Follow-up fibroscopies (185) were useful in all cases for aspiration of the patient and observation of the suture. In 17 cases, the opportunity was taken to remove a polyp and in 10 cases removal of a suture. Finally, the authors emphasize the safety of this method of investigation (4 % of untoward incidents) which they feel to be necessary and adequate in the evaluation of laryngotracheal stenosis.,

Endoscopy↗
PubMed1979

[Audiovestibular exploration of the brain stem (author's transl)].

In the context of a postgraduate lecture for specialist physicians, the author describes techniques of objective audiology used on a daily basis in the exploration of the brain stem in the ENT department of Lariboisiere Hospital. The following are reviewed for each of them: --the corresponding anatomical pathways, --the principles and techniques used. The results are illustrated by examples. Increase in the threshold of stapes acoustic reflex above 95 dB on a frequency of 1,000 Hz is highly suggestive of acoustic nerve involvement or the lower part of the brain stem (bar sign). By contrast, the threshold is normal in endocochlear and supratentorial disorders. Comparison of abnormalities in stapes acoustic reflex in ipsi and contralateral stimulation, and in particular analysis of changes in their dynamics, often makes it possible to localise the problem to the acoustic nerve, the facial nerve or the brain stem itself. Recording of brain stem evoked auditory potentials (BERA), combined if necessary with that of the electro-cochleogram, is a delicate technique. This is the most useful and most precise audiological tool available to make a precise diagnosis of acoustic neuroma and to localise brain stem disease.

Acoustic Impedance Tests↗