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The paper discusses the question of which factors that are to be taken into consideration are of relevance to the expert in making his differential diagnosis in cases of occupational hearing loss. On the basis of the medical literature and earlier investigations the discussion is concerned with the proof of recruitment as well as with the effects of the(More)
The paper deals with the investigations carried out into the effects of the exposure level on the hearing thresholds in the range of 0.5--4 kHz. The investigations are based on the data of 25,544 workers exposed to noise at their working places ("noise workers"). The hearing thresholds at 0.5 and 1 kHz practically do not differ in any level class nor do(More)
Pure tone audiograms of 80 workmen with preexisting endogenous cochlear hearing loss were investigated over an average of 16 years (range 10 to 26) of occupational exposure to noise. Further hearing deterioration was moderate in the majority of cases more severe hearing losses more often affected the low tone range. The pure tone threshold 0.25 to 8 kHz(More)
Measuring curves and psycho-acoustical measurements are used for an investigation of the extent to which the bone-conduction hearing aid is equivalent to the air-conduction hearing aid. It can be shown that basically there is no objection against the use of a bone-conduction hearing aid (ear-level aid) for patients suffering only from sound-conduction(More)
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(More)
In the assessment of noise-induced hearing loss problems arise mainly in those cases where the middle frequencies are involved in the hearing defects at a proportionally high degree, because this strongly impairs the speech discrimination and because such a hearing defect cannot be regarded as a typical case of noise-induced hearing loss. A recruitment test(More)
A hearing aid with dynamic compression and the very same one without dynamic compression were used for an examination of 13 patients with recruitment who were hard of hearing with respect to sound perception. The maximum degree of speech discrimination possible to be reached was determined. Although in general the hearing aid with dynamic compression(More)
The paper reports about a female patient who developed an uncommon, unilateral, reversible hearing defect while suffering from multiple sclerosis. The tone audiogram showed a break in the hearing threshold curve down to values no longer measurable, progressing from the high to the low frequencies. There were all symptoms of a retrocochlear hearing defect.(More)
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