scholarly journals Vestibular nerve compression: role of auditory brainstem response and cervical vestibular evoked myogenic potentials

2017 ◽  
Vol 3 (3) ◽  
pp. 749
Author(s):  
Deepa A. Valame ◽  
Geeta B. Gore
Keyword(s):  
Low Frequency ◽  
Auditory Brainstem ◽  
Cochlear Nerve ◽  
Vestibular Evoked Myogenic Potentials ◽  
Anterior Inferior Cerebellar Artery ◽  
Mri Findings ◽  
Study Approach ◽  
Compression Syndrome ◽  
Brainstem Response

<p>The objective of the study was to evaluate the role of ABR and cVEMP in the diagnosis of vestibular compression syndrome (VCS) and to study the association of test results with the MRI findings. This is a case-report of four patients with VCS using case-study approach.<strong><em> </em></strong>Four patients with varying degrees of indentation of vestibulo-cochlear nerve by the anterior inferior cerebellar artery (AICA) loops were studied. Episodic rotatory vertigo was reported by three cases and two cases complained of tinnitus but the characteristic low-frequency ‘type-writer’ type of tinnitus was seen in only one. All cases showed evidence of retrocochlear pathology on ABR although two had normal peripheral hearing status. The cVEMP abnormalities noted were absence of cVEMP and reduced amplitude of cVEMP as compared to instrument-specific age-matched norms; only one case with no indentation of vestibulo-cochlear nerve had normal cVEMP tracings. Presence of AICA loops on the MRI by itself need not necessarily indicate vestibular compression syndrome. However when MRI excludes any other pathology in cases with symptoms such as unilateral sensorineural hearing loss, tinnitus, vertigo; vestibular compression could be the etiology. The likelihood of abnormal test findings is greater when the loop causes indentation of the nerve. </p>

scholarly journals Vestibular Hearing and Neural Synchronization

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Seyede Faranak Emami ◽  
Ahmad Daneshi
Keyword(s):  
Low Frequency ◽  
Pure Tone Audiometry ◽  
Auditory Brainstem ◽  
Nerve Fibers ◽  
Auditory Brainstem Responses ◽  
Vestibular Evoked Myogenic Potentials ◽  
Fast Wave ◽  
Response Component ◽  
Neural Synchronization ◽  
Brainstem Response

Objectives. Vestibular hearing as an auditory sensitivity of the saccule in the human ear is revealed by cervical vestibular evoked myogenic potentials (cVEMPs). The range of the vestibular hearing lies in the low frequency. Also, the amplitude of an auditory brainstem response component depends on the amount of synchronized neural activity, and the auditory nerve fibers' responses have the best synchronization with the low frequency. Thus, the aim of this study was to investigate correlation between vestibular hearing using cVEMPs and neural synchronization via slow wave Auditory Brainstem Responses (sABR). Study Design. This case-control survey was consisted of twenty-two dizzy patients, compared to twenty healthy controls. Methods. Intervention comprised of Pure Tone Audiometry (PTA), Impedance acoustic metry (IA), Videonystagmography (VNG), fast wave ABR (fABR), sABR, and cVEMPs. Results. The affected ears of the dizzy patients had the abnormal findings of cVEMPs (insecure vestibular hearing) and the abnormal findings of sABR (decreased neural synchronization). Comparison of the cVEMPs at affected ears versus unaffected ears and the normal persons revealed significant differences (P<0.05). Conclusion. Safe vestibular hearing was effective in the improvement of the neural synchronization.

scholarly journals Diagnostic Yield of MRI for Sensorineural Hearing Loss – An Audit

2020 ◽  
Vol 47 (5) ◽  
pp. 656-660
Author(s):  
Helen Wong ◽  
Yaw Amoako-Tuffour ◽  
Khunsa Faiz ◽  
Jai Jai Shiva Shankar
Keyword(s):  
Hearing Loss ◽  
Sensorineural Hearing Loss ◽  
Diagnostic Yield ◽  
Internal Auditory Canal ◽  
Auditory Brainstem ◽  
Sensorineural Hearing ◽  
Vestibular Evoked Myogenic Potentials ◽  
Clinical Indication ◽  
Presenting Symptoms ◽  
Brainstem Response

ABSTRACT:Purpose:Contrast-enhanced magnetic resonance imaging (CEMRI) of the head is frequently employed in investigations of sensorineural hearing loss (SNHL). The yield of these studies is perceptibly low and seemingly at odds with the aims of wise resource allocation and risk reduction within the Canadian healthcare system. The purpose of our study was to audit the use and diagnostic yield of CEMRI for the clinical indication of SNHL in our institution and to identify characteristics that may be leveraged to improve yield and optimize resource utilization.Materials and methods:The charts of 500 consecutive patients who underwent CEMRI of internal auditory canal for SNHL were categorized as cases with relevant positive findings on CEMRI and those without relevant findings. Demographics, presenting symptoms, interventions and responses, ordering physicians, and investigations performed prior to CEMRI testing were recorded. Chi-squared test and t-test were used to compare proportions and means, respectively.Results:CEMRI studies revealed relevant findings in 20 (6.2%) of 324 subjects meeting the inclusion criteria. Pre-CEMRI testing beyond audiometry was conducted in 35% of those with relevant positive findings compared to 7.3% of those without (p < 0.001). Auditory brainstem response/vestibular-evoked myogenic potentials were abnormal in 35% of those with relevant CEMRI findings compared to 6.3% of those without (p < 0.001).Conclusion:CEMRI is a valuable tool for assessing potential causes of SNHL, but small diagnostic yield at present needs justification for contrast injection for this indication. Our findings suggest preferred referral from otolaryngologists exclusively, and implementation of a non-contrast MRI for SNHL may be a better diagnostic tool.

Low-Frequency Auditory Brainstem Response Threshold

1988 ◽  
Vol 17 (3) ◽  
pp. 171-178 ◽  
Author(s):  
E. Laukli ◽  
O. Fjermedal ◽  
I. W. S. Mair
Keyword(s):  
Auditory Brainstem Response ◽  
Low Frequency ◽  
Auditory Brainstem ◽  
Response Threshold ◽  
Brainstem Response

Role of Electrically Evoked Auditory Brainstem Response in Cochlear Implantation of Children With Inner Ear Malformations

2008 ◽  
Vol 29 (5) ◽  
pp. 626-634 ◽  
Author(s):  
Ana H. Kim ◽  
Paul R. Kileny ◽  
H. Alexander Arts ◽  
Hussam K. El-Kashlan ◽  
Steven A. Telian ◽  
...  
Keyword(s):  
Inner Ear ◽  
Cochlear Implantation ◽  
Auditory Brainstem Response ◽  
Auditory Brainstem ◽  
Inner Ear Malformations ◽  
Ear Malformations ◽  
Brainstem Response

scholarly journals Role of the temporal window in dolphin auditory brainstem response onset

2020 ◽  
Vol 148 (5) ◽  
pp. 3360-3371
Author(s):  
James J. Finneran ◽  
Jason Mulsow ◽  
Madelyn G. Strahan ◽  
Dorian S. Houser ◽  
Robert F. Burkard
Keyword(s):  
Auditory Brainstem Response ◽  
Auditory Brainstem ◽  
Temporal Window ◽  
Response Onset ◽  
Brainstem Response

scholarly journals Seismic sensitivity and bone conduction mechanisms enable extratympanic hearing in salamanders

2020 ◽  
Vol 223 (24) ◽  
pp. jeb236489
Author(s):  
G. Capshaw ◽  
D. Soares ◽  
J. Christensen-Dalsgaard ◽  
C. E. Carr
Keyword(s):  
Sound Pressure ◽  
Bone Conduction ◽  
Low Frequency ◽  
Threshold Level ◽  
Auditory Brainstem ◽  
Common Mechanism ◽  
Experimental Conditions ◽  
Airborne Sound ◽  
Sound Detection ◽  
Brainstem Response

ABSTRACTThe tympanic middle ear is an adaptive sensory novelty that evolved multiple times in all the major terrestrial tetrapod groups to overcome the impedance mismatch generated when aerial sound encounters the air–skin boundary. Many extant tetrapod species have lost their tympanic middle ears, yet they retain the ability to detect airborne sound. In the absence of a functional tympanic ear, extratympanic hearing may occur via the resonant qualities of air-filled body cavities, sensitivity to seismic vibration, and/or bone conduction pathways to transmit sound from the environment to the ear. We used auditory brainstem response recording and laser vibrometry to assess the contributions of these extratympanic pathways for airborne sound in atympanic salamanders. We measured auditory sensitivity thresholds in eight species and observed sensitivity to low-frequency sound and vibration from 0.05–1.2 kHz and 0.02–1.2 kHz, respectively. We determined that sensitivity to airborne sound is not facilitated by the vibrational responsiveness of the lungs or mouth cavity. We further observed that, although seismic sensitivity probably contributes to sound detection under naturalistic scenarios, airborne sound stimuli presented under experimental conditions did not produce vibrations detectable to the salamander ear. Instead, threshold-level sound pressure is sufficient to generate translational movements in the salamander head, and these sound-induced head vibrations are detectable by the acoustic sensors of the inner ear. This extratympanic hearing mechanism mediates low-frequency sensitivity in vertebrate ears that are unspecialized for the detection of aerial sound pressure, and may represent a common mechanism for terrestrial hearing across atympanic tetrapods.

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