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Biomedical subjects

J Stahle

Publications and source records attributed to J Stahle.

At least 73 records · Page 4Linked to original sources
PubMedDate not supplied

Human cochlear aqueduct and its accessory canals.

The anatomy of the adult human cochlear aqueduct and its surrounding structures, and their normal variations at tomography, microdissection and plastic molding are described. The mean length of the aqueduct is 12.9 mm and the mean width of its funnel-shaped external aperture 4.2 mm. The mean width of the narrowest portion is 0.14 mm. No difference in aqueductal width was found between the youngest and oldest age groups. Complete bony obstruction was revealed at microdissection in 3 out of 82 specimens. In the remaining 79 the entire aqueduct was patent. The aqueduct usually runs parallel to the internal auditory canal when seen from above, and the AP projection is therefore most suitable for tomography. At tomography the entire aqueduct was visualized in 60% of the specimens. The isthmic portion was not visible in 40%. Major reasons for nonvisualization of the entire aqueduct are: 1) a luminal width less than 0.1 mm, 2) a high jugular fossa, 3) a posteriorly directed aqueductal convexity (10%), and 4) bony obliteration (4)%). Accessory canals close to and often wider than the aqueduct may complicate tomographic evaluation of the aqueductal patency. Nonvisualization of the aqueduct at tomography does not necessarily indicate nonpatency.

Adult↗
PubMedDate not supplied

Advanced Meniere's disease. A study of 356 severely disabled patients.

A selected material of 356 patients with Meniere's disease, all severely disabled by paroxysmal vertigo, was analysed. The question under study was to what extent and in what way the severe vertigo is reflected in the caloric reaction and in the level of hearing. The caloric response, expressed as differences in right/left sensitivity, was reduced in 59% and exaggerated in 1% of the patients; in the remaining 40% it was normal. The median values for pure tone audiogram, speech reception threshold and speech discrimination score were 56 dB,60 dB and 54%, respectively. The hearing deteriorated considerably in the early stage of the disease, but the hearing level stabilised with time. A parallelism between acoustic and vestibular dysfunction was demonstrated. Reduction of the pure tone threshold was accompanied by a progressive decrease in caloric response. The frequency of bilateral cases increased with lengthening duration of illness. All patients included in this investigation have since undergone operation.

Adult↗