Is the nerve origin of the vestibular schwannoma correlated with vestibular evoked myogenic potential, caloric test, and auditory brainstem response?

2009 ◽  
Vol 129 (10) ◽  
pp. 1095-1100 ◽  
Author(s):  
Munetaka Ushio ◽  
Shinichi Iwasaki ◽  
Yasuhiro Chihara ◽  
Nobutaka Kawahara ◽  
Akio Morita ◽  
...  
Keyword(s):  
Vestibular Schwannoma ◽  
Auditory Brainstem Response ◽  
Auditory Brainstem ◽  
Caloric Test ◽  
Vestibular Evoked Myogenic Potential ◽  
Myogenic Potential ◽  
Brainstem Response

Acoustically evoked, short latency negative response in children with sensorineural hearing loss

2009 ◽  
Vol 124 (2) ◽  
pp. 141-146 ◽  
Author(s):  
A A Emara
Keyword(s):  
Hearing Loss ◽  
Sensorineural Hearing Loss ◽  
Auditory Brainstem Response ◽  
Auditory Brainstem ◽  
Short Latency ◽  
Sensorineural Hearing ◽  
Negative Response ◽  
Vestibular Evoked Myogenic Potential ◽  
Myogenic Potential ◽  
Brainstem Response

AbstractIntroduction:The auditory brainstem response consists of fast and slow waves. The acoustically evoked, short latency negative response is a large, negative deflection with a latency of 3 milliseconds which has been reported in patients with profound hearing loss. It may be of vestibular, particularly saccular, origin, as is the vestibular evoked myogenic potential.Purpose:To assess the presence of acoustically evoked, short latency negative responses in children with severe to profound sensorineural hearing loss.Materials and methods:Twenty-three children (46 ears) with sensorineural hearing loss underwent audiological evaluation and auditory brainstem response, vestibular evoked myogenic potential and caloric testing.Results:An acoustically evoked, short latency negative response was present in 30.43 per cent of ears and absent in 69.57 per cent. Vestibular evoked myogenic potentials were recorded in all ears in the former group, but in only 53.13 per cent in the latter group. Caloric testing was normal in 82.6 per cent of the total ears tested.Conclusion:The presence of an acoustically evoked, short latency negative response is dependent not on residual hearing but on normal saccular function. This response can be measured in patients who cannot contract their neck muscles.

The N3 potential and the efferent cochlear pathway in profound sensorineural hearing loss

2017 ◽  
Vol 131 (4) ◽  
pp. 334-340 ◽  
Author(s):  
M H Abou-Elew ◽  
N A Hosni ◽  
E A Obaid ◽  
A H Ewida
Keyword(s):  
Hearing Loss ◽  
Sensorineural Hearing Loss ◽  
Auditory Brainstem Response ◽  
Auditory Brainstem ◽  
Sensorineural Hearing ◽  
Potential Response ◽  
Vestibular Evoked Myogenic Potential ◽  
Myogenic Potential ◽  
Significant Difference ◽  
Brainstem Response

AbstractObjective:This study aimed to evaluate the presence of the N3 potential (acoustically evoked short latency negative response) in profound sensorineural hearing loss, its association with the cervical vestibular evoked myogenic potential and the relationship between both potentials and loss of auditory function.Methods:Otological examinations of 66 ears from 50 patients aged from 4 to 36 years were performed, and the vestibular evoked myogenic potential and auditory brainstem response were measured.Results:The N3 potential was recorded in 36 out of 66 ears (55 per cent) and a vestibular evoked myogenic potential was recorded in 34 (52 per cent). The N3 potential was recorded in 23 out of 34 ears (68 per cent) with a vestibular evoked myogenic potential response and absent in 19 out of 32 ears (59 per cent) without a vestibular evoked myogenic potential response. The presence of an N3 potential was significantly associated with a vestibular evoked myogenic potential response (p = 0.028), but there was no significant difference in the latency or amplitude of the N3 potential in either the presence or absence of a vestibular evoked myogenic potential.Conclusion:The presence of an N3 potential in profound sensorineural hearing loss with good or poor vestibular function can be explained by the contribution of the efferent cochlear pathway through olivocochlear fibres that join the inferior vestibular nerve. This theory is supported by its early latency and reversed polarity, which is masked in normal hearing by auditory brainstem response waves.

Temporal bone pathology of acoustic neuroma correlating with presence of electrocochleography and absence of auditory brainstem response

1997 ◽  
Vol 111 (10) ◽  
pp. 967-972 ◽  
Author(s):  
Kimitaka Kaga ◽  
Shinichi Iwasaki ◽  
Akira Tamura ◽  
Jun-Ichi Suzuki ◽  
Hideyuki Haebara
Keyword(s):  
Temporal Bone ◽  
Vestibular Schwannoma ◽  
Auditory Brainstem Response ◽  
Action Potentials ◽  
Auditory Brainstem ◽  
Cochlear Nerve ◽  
Bone Pathology ◽  
Compound Action Potentials ◽  
Brainstem Response ◽  
Compound Action

AbstractThe temporal bone pathology of a 74-year-old female affected by vestibular schwannoma was compared with findings of auditory brainstem response and electrocochleography. At age 71, she complained of hearing loss in the left ear in which pure tone audiometry revealed threshold elevation in the middle- and high-frequency range. Temporal bone CT scanning revealed a medium-sized cerebellopontine angle tumour in the left ear. ABR showed no response in the left ear, but the electrocochleography showed clear compound action potentials. Three years later, at age 74, she died of metastatic lung cancer and sepsis. The left temporal bone pathology consisted primarily of a large vestibular schwannoma occupying the internal auditory meatus. The organ of Corti was well preserved in each turn. In the modiolus, the numbers of spiral ganglion cells and cochlear nerve fibres in each turn were decreased. These histological findings suggest that clear compound action potentials were recorded from the distal portion of the cochlear nerve in spite of the presence of the vestibular schwannoma, but ABR could not be detected because of the blockade of the proximal portion of the cochlear nerve by the vestibular schwannoma.

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