B Welleschik

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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)
Otoliquorrhoea occurred during stapedectomy (gusher) and signified a case of inner ear malformation which was not apparent on preoperative tomograms but could be demonstrated on postoperative CT scans. There was no bony separation between the irregularly dilated inner auditory canal and the vestibulum. The cochlea was not fully rotated. Intraoperative(More)
Tonsilloadenoidectomy performed on an 8-year old girl, in the course of which heavy bleeding from the left niche was staunched by suture ligation, was complicated from the 7th day onwards by severe haemorrhages at intervals from 5 to 25 days, causing life-threatening hypovolaemia. Haemorrhages started mostly in the early morning hours and ceased(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)
Experimental data on the influence of test frequency on the SISI-score are controversial. Comparability is limited by the diversity of experimental conditions. In a series of cases of pancochlear sudden hearing loss SISI-scores at 0.5 kHz and 3 kHz were compared. Some examples show that the sensitivity of the SISI-test at 0.5 kHz is much lower to that at 3(More)
The theory that sudden hearing loss is caused by some form of vascular catastrophe has not been confirmed by pathological evidence, but it agrees with a number of clinical observations. But there are several pieces of experimental and clinical evidence that cast serious doubt upon a vascular hypothesis, especially the considerable variability in site and(More)
The computation of percentage hearing loss usually uses tables giving the values. Using such tables an incorrect reading off or a miscalculation is not infrequent. A computerprogram for pocket computers in BASIC is presented, which allows to compute the percentage hearing loss according the tables for speech audiometry by Boenninghaus und Röser introduced(More)
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(More)
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(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)