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Biomedical subjects

D Portmann

Publications and source records attributed to D Portmann.

34 records · Page 2Linked to original sources
PubMed1989

[Labyrinthine fistulae].

The study is based on 44 cases of labyrinthic fistulas which were almost always discovered per-operatively. The authors describe the different stages of evolution, grouped under the term of "fistula". Having summed up the main therapeutic guidelines published since 1950 and following the study of the different cases presented, a therapeutic approach is proposed which takes into account the condition of the opposite ear and the open or closed technique selected. As far as audiometry is concerned, the cochlear reserve must be safeguarded. Technically speaking, the best attitude is to carry out the ablation of the matrix in one or two phases depending on the size, to prefer a closed technique and to drain the fistula at the end of the operation.

Audiometry↗
PubMed1989

Techniques of tympanomastoidectomy.

The authors describe the various techniques of tympanomastoidectomy that can be used to eradicate chronic disease processes. The techniques are either open or closed operations; the factors in determining the choice of technique for specific conditions are presented.

Humans↗
PubMed1989

[Use of a temporoparietal fascial flap in difficult reconstructions of the external ear].

Temporo parietal fascial flap is a way of total ear reconstruction when there is not a sufficient quantity of available skin in auricular region. This flap very thin, supplied by superficial temporal vessels is located above the auricle and can cover the framework's convolutions. This technique has been well described by Burt Brent. Our experience is based upon 12 total ear reconstruction with this kind of flap. When there is an extreme skin shortage, but of good quality, we discuss the technique of skin expander.

Ear, External↗
PubMedDate not supplied

[Electrocochleography and topographic diagnosis].

We present a group of 50 patients with retrocochlear pathology, divided on 41 (82 per 100) non tumoral and 9 (18 per 100) tumoral: 8 cerebello-pontine angle meningiomas and 1 intracranial cholesteatoma. The retrocochlear diagnosis of the pathology is assessed by the results of the audiovestibular explorations, specially the electrophysiology (early auditory evoked response, electrocochleography). The neuroradiologic explorations (TAC, MNR) define the tumoral or non tumoral nature of the pathology. We review some technical aspects of the common electrocochleographic practice, as actually is realised by the Bordeaux group; also, the different parameters of a retrocochlear pathologic response. In this group, the electrocochleography was necessary on 64 per 100 of the cases to obtain an electrophysiologic retrocochlear diagnostic.

Acoustic Impedance Tests↗
PubMedDate not supplied

[Stapedial reflex in nontumor retrocochlear pathology].

The authors study the different parameters of the stapedius reflex on a 55 patients group with retrocochlear and non tumoral diagnostic is assess by electrophysiologic (BERA, Electrocochleography) and neuroradiologic explorations (TAC), Meato-cisternography, NMR). We realise an comparative study between the results of this group and the results of 2 other groups (98 acoustic neuromas and 104 endocochlear diseases). The test has a moderate sensibility and none specificity in this kind of pathology, because the high percent of false negative (30%), and the positivity on 95% of acoustic neuromas and on 74% of endocochlear diseases.

Acoustic Impedance Tests↗