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Biomedical subjects

B Welleschik

Publications and source records attributed to B Welleschik.

27 records · Page 2Linked to original sources
PubMed1976

[Experiences gained with Békésy audiometry (author's transl)].

477 Békésy audiograms were classified according to Jerger, and the percentage rates of the individual types were juxtaposed as concerns the frequency-sliding and frequency-constant methods. By means of the frequency-constant method a higher percentage of pathological conditions can be demonstrated. In two patients with retro-cochlear defects (pontine-angle tumor) the defect cannot be pinpointed at all by means of the frequency-sliding method. The results are demonstrated to depend on the frequency in the case of the frequency-constant method.

Audiometry↗
PubMed1976

[Noise risk due to dental turbines].

Sound level measurements and frequency analyses were carried out on dental turbines in order to assess the risk of hearing defects due to the noise caused by such turbines. The measured values were related to other factors (exposure time, noise pauses) and the overall situation was evaluated. A major leasion of the auditory organ due to the noise caused by dental turbines seems unlikely.

Dental High-Speed Equipment↗
PubMed1976

[The capacity to destinguish changes in the intensity as a function of volume and frequency (author's transl)].

Békésy audiometry equipment was used for investigations carried out in 15 test persons to study the intensity differentiation threshold. We tried to find the degree of intensity required to recognize given dB changes in the intensity. The results achieved very well coincide with those established by other authors. It was possible to statistically prove the volume dependence of the intensity differentiation threshold, it was, however, not possible to establish any frequency dependence. The relations of our result with the SISI test are under discussion.

Audiometry↗
PubMedDate not supplied

The critical intensity for occupational noise.

Decades of medical examinations have shown that large-scale risks of hearing defects exist not only from 90 dB(A) upwards, but even from 85 dB(A) upwards. This experience is confirmed by the analysis of 25,000 tone threshold audiograms and by the results of experimental hearing fatigue tests.

Audiometry, Pure-Tone↗
PubMedDate not supplied

[Streptomycin-induced damage of the spiral ganglion].

The neuronal density in the spiral ganglion was investigated in normal and in streptomycin-intoxicated guinea pigs. Streptomycin was administered in a dose of 250 mg/kg for 21 days. 6 weeks after the streptomycin exposure a histological examination revealed a decrease in ganglion cell density in the spiral ganglion, with maximum loss in the apical portion of the ganglion. As mechanisms of the ototoxic effect, a secondary degeneration of spiral ganglion cells after hair cell loss or a primary neurotoxic degeneration are discussed.

Animals↗