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Biomedical subjects

G Despreaux

Publications and source records attributed to G Despreaux.

6 recordsLinked to original sources
PubMed1991

[Our surgical experience of 20 extracochlear implantations on the oval window with transcutaneous approach].

While multichannel implants can produce far better results than single-channel implants, the results of a multichannel implantation are impossible to predict accurately preoperatively. Single-channel implants, which produce average and constant results, still have a major merit in that their cost is much lower. Since extracochlear implantation with transcutaneous approach is innocuous, we have been promoting this type of implantation as a temporary procedure until much more effective systems are found in the future, or as a definitive implantation.

Deafness↗
PubMed1990

[Atypical implants].

There is theoretically no major surgical problem for implantation. The basic techniques all include on an approach through the windows. The authors describe a solution (which has already been used previously) for cophotic hollowing-out cavities, with a suprapetrosal way and an approach on the hidden aspect of the cochlea. The transcutaneous passage can be displaced from the ear lobe to a depression of the auricle.

Cochlear Implants↗
PubMed1990

[Electrophysiologic studies in patients with cochlear implants].

The insertion of reliable extracochlear single-canal cochlear implants in cophotic and subcophotic patients allows the electrical stimulation of the acoustic nerve for rehabilitation, as well as audiovestibular explorations that are no longer possible in the acoustic mode. The authors therefore aim at replacing all these examinations with their Electrical equivalent: --early evoked potentials (E-BERA), --medium-latency evoked potentials (E-MLR), --Event-related evoked potentials (E-P300), for which, to our knowledge, theses are the first recordings, --electrical stapedial reflex, --vestibular stimulations. The method, results and clinical and physiological applications of each method are given, as well as its prospects.

Acoustic Stimulation↗
PubMed1990

[Tinnitus and implants].

The experience with cochlear implantation at Avicenne hospital prompted us to carry out a retrospective study on tinnitus in a population of operated patients. Improvement or disappearance of the symptoms was noted in all cases. These results, which partly match those found in the literature, are probably produced by rehabilitation inhibiting the "deafferentation" mechanisms in analogy with pain phenomena. In some precise cases, which are described, they led us to proposing implantation even though the main, if not sole, complaint of the patient was tinnitus.

Acoustic Stimulation↗
PubMed1988

[Electrical stimulation of the fenestra ovale. Perspectives].

Amongst the various sites for stimulation of the internal ear, in monocanal-extra-cochlear system, the fenestra ovale has virtually never been used. The authors suggest a cup-shaped electrode placed at the end of an incudo-vestibular prosthesis, such as a teflon piston, after stapedectomy and interposition of connective tissue. The immediate advantage of such a method is the fixation of the electrode. Tolerance is excellent and electrical impedance remained stable at very satisfactory levels. The future perspective appearing most promising is based upon simultaneous use of electrical and acoustic stimulation.

Acoustic Stimulation↗