Laryngo- rhino- otologie
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Laryngo- rhino- otologie · Dec 1996
[Effect of inner ear hearing loss on delayed otoacoustic emissions (TEOAE) and distortion products (DPOAE)].
The assessment of inner ear hearing loss by means of evoked otoacoustic emissions (EOAE) is already established in practice. Nevertheless, empirical data on the relations between emission and audiologic parameters are required. ⋯ The sharpness of the transition between clear responses and absent responses decreases with increasing age. Therefore, the combination of TEOAE and DPOAE recording with the purpose of hearing threshold assessment is especially useful in young patients. Further evaluation shows that male and female patients do not differ in the hearing loss dependent prevalence of otoacoustic emissions. On he other hand, a systematic but not significant influence of the audiogram shape on the parameters of the discrimination function can be observed: steep audiograms are described with a discrimination function, which drops to zero at higher levels of hearing loss and with a larger slope than shallow audiograms. The comparison of right and left ear emissions of the same patient shows that large amplitude differences occur even in cases of comparable subjective thresholds; missing emissions in one ear are observed if and only if the interaural threshold difference exceeds 30 dB.
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Laryngo- rhino- otologie · Dec 1996
Case Reports[Primary unrecognized gunshot wound in the frontal skull base].
Craniocerebral gunshot wounds demand a high degree of skill in clinical treatment. In addition to painstaking history, modern imaging techniques for preoperative diagnosis and interdisciplinary surgical treatment are important. ⋯ Diagnosis and therapeutic principles are discussed on the basis of a case study of a 21-year-old soldier with an unusual craniocerebral gunshot wound.