Beeinflußbarkeit otoakustischer Emissionen durch kontralaterale Stimulation bei Patienten mit Innenohrstörungen

Gunzenhäusser, Eva; Maurer, JT; Mann, W. W. Hof

doi:10.1007/978-3-642-84996-1_227

Cited by 1 publication

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“…The anastomosis of Oort, 15 in which these fibers cross from the vestibular nerve to the auditory nerve and are unmyelinated for a short distance, are perhaps a site of low resistance in this regard. Smaller amplitude reductions in response to contralateral noise and paradoxic reactions have also been observed in ears with sensorineural hearing loss 16 , 17 …”

Section: Discussionmentioning

confidence: 93%

“…Indeed, it is well recognized that tumors may change the auditory brain stem responses of the contralateral ear, with a lengthened wave III‐V interval, especially if the tumor is larger than 3 cm. When the data are compared with those of a group of 21 patients with sudden sensorineural hearing loss, 16 the finding of significant decrease in amplitude of TEOAE with contralateral noise is unique to acoustic tumors. Whether this finding will also be identified in other diseases involving the brain stem or the cerebellopontine angle is a subject for further study.…”

Section: Discussionmentioning

confidence: 99%

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Effects of contralateral white noise stimulation on transitory evoked otoacoustic emissions in patients with acoustic neuroma

Maurer¹,

Hinni²,

Beck³

et al. 1995

Otolaryngol.--head neck surg.

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Transitory evoked otoacoustic emissions are normal phenomena observed in most persons with hearing levels greater than 35 dB. Further, masking of the contralateral ear produces amplitude reductions in the transitory evoked otoacoustic emissions. We have undertaken a study of transitory evoked otoacoustic emissions in 20 patients with acoustic neuroma. All patients were assessed for transitory evoked otoacoustic emissions bilaterally, with and without contralateral masking with white band noise at 40, 50, and 60 dB. We found that transitory evoked otoacoustic emissions were present in 30% of ears with tumor and that the presence of transitory evoked otoacoustic emissions is associated with improved preoperative hearing levels, but that tumor size is not associated with the presence or absence of transitory evoked otoacoustic emissions. The amplitude of transitory evoked otoacoustic emissions from ears with tumor, when present, is decreased when compared with normal ears of normal patients. Further, with contralateral masking little of the amplitude reduction observed in normal patients is observed in the ears with acoustic neuroma. However, with masking of the contralateral ear, the ear without tumor demonstrated significantly greater amplitude reductions than normal ears from normal patients ( p = 0.0006). Pertinent anatomy and possible explanations for these findings are discussed.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%