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Biomedical subjects

A Mathis

Publications and source records attributed to A Mathis.

At least 109 records · Page 6Linked to original sources
PubMed1985

[Significance of electrocochleography within the scope of audiologic diagnosis].

Despite the extensive applicability of brainstem evoked response audiometry (= BERA), electrocochleography (= ECochG) occupies an undisputed place among audiological diagnostic methods. It is useful, among other things, in the early identification or confirmation of hearing defects in children, since it permits measurement of the auditory threshold and of the characteristics of the suprathreshold area, and may aid in excluding ambiguous findings resulting from subjective audiometric or other objective audiometric methods in certain cases. In this regard, it makes possible a valid early prescription of hearing aids to children with auditory defects; in addition, in certain cases it provides valuable additional information and can be employed in solving simulation and masking problems. The diagnostic validity of ECochG in Menière's disease requires continued investigation. To sum up, we can say that ECochG should be performed only at centres where the frequency of examinations guarantees the necessary expert knowledge.

Audiometry↗
PubMed1984

Optic nerve head drusen. High-resolution computed tomographic approach.

Optic nerve head drusen are rare, inherited concretions, which are almost always calcified; their appearance must be known because they represent one of the major causes of pseudopapilledema. The computed tomographic (CT) scan can show small and buried drusen, which are sometimes difficult to diagnose by the ophthalmoscopic examination. Four cases of drusen (two bilateral and two unilateral) were confirmed or diagnosed by high-resolution CT. The CT appearance of drusen is characteristic because the calcifications are well defined, punctate, and strictly located in the optic disc. The use of high-resolution CT scanners is very helpful.

Adult↗
PubMed1984

Retinitis pigmentosa associated with astrocytic hamartomas of the optic disc.

A case of retinitis pigmentosa associated with astrocytic hamartomas of the optic disc is described. The rarity of tuberous sclerosis in this association is discussed, as well as differences between optic nerve head drusen and astrocytic hamartomas ('giant drusen') which can both be associated with retinitis pigmentosa.

Adolescent↗
PubMed1984

[Hemorrhage in the vitreous and retinal venous loop in a diabetic subject].

A vitrectomy was performed in a diabetic patient because of unilateral vitreous hemorrhage, which persisted for six months. There was only background retinopathy in the other eye. In the operated eye, no proliferative retinopathy was found. During surgery a partial posterior vitreous detachment was noted with persistent vitreoretinal attachment to the superotemporal vascular arcade. Postoperative fundus examination and fluorescein angiography showed background retinopathy and the presence of a venous loop involving the superotemporal vein. Histologic description of venous loops with vitreoretinal adhesion was recently reported and it was suggested that this could lead to vitreous hemorrhage even in absence of severe proliferative retinopathy. To our knowledge, there is no previous report of diabetic vitreous hemorrhage probably due to a venous loop with vitreoretinal attachment.

Adult↗
PubMed1983

[Superior bullous retinal detachment: value of the intravitreous injection of sulfur hexafluoride].

15 cases of superior bullous hemi-retinal detachment were repaired during a 16-month period, with a post-operative follow-up of 3-19 months. Intravitreal injection of 0,75-1,5 cc of pure sulfur hexafluoride (SF 6) was performed in 9 cases. The indications for injection at the end of the procedure were: 1) absence of chorioretinal contact in spite of an indentation in the correct position; 2) fishmouth configuration of the retinal break; 3) presence of radial folds over an indentation parallel to the limbus. Only two out of patients required a second operation, due to the development of proliferative vitreoretinopathy. One case was unsuccessful because of a redetachment secondary to massive periretinal proliferation. No complication was observed with the injection of SF 6. In particular, ocular hypertension was avoided by controlling the amount of gas used, always inferior to 2 cc, and postoperative treatment with acetazolamide and topical timolol. The intraocular injection of SF 6 appears to be useful contribution to the surgical treatment of superior bullous hemi-retinal detachment, allowing effective and durable internal tamponade, while avoiding prolonged bedrest.

Absorption↗