scholarly journals Influence of bone conduction transducer type and placement on ocular and cervical vestibular evoked myogenic potentials

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Laura Fröhlich ◽  
Maira Wilke ◽  
Stefan K. Plontke ◽  
Torsten Rahne
Keyword(s):  
Reference Data ◽  
Bone Conduction ◽  
Response Rates ◽  
Normal Subjects ◽  
Vestibular Evoked Myogenic Potentials ◽  
Coupling Force ◽  
Set Up ◽  
Insert Earphones ◽  
Healthy Participants ◽  
Transducer Type

AbstractEvaluating the effectiveness of different bone conduction (BC) transducers with controlled coupling force to elicit cervical and ocular vestibular evoked myogenic potentials (cVEMPs, oVEMPs) in healthy subjects by comparing response rates, amplitudes, latencies, thresholds and asymmetry ratios. Prospective experimental study including healthy participants. VEMPs were measured to different stimulation modes; the BC transducer coupling force was controlled to 5.4 (± 0.5) Newton. cVEMPs: to bone conducted vibration (BCV) with the B81 transducer on the mastoid; oVEMPs: to BCV with the B81 on the mastoid, BCV with the B81 on the forehead, and BCV with the Mini-Shaker 4810 on the forehead. Air conducted sound (ACS) with insert earphones was used as reference. Data of 24 normal subjects (mean age 25.3 (± 3.0) years) were analyzed. ACS and BCV with the B81on the mastoid evoked cVEMPs in 100% of ears. The highest oVEMP response rates were obtained with the B81 on the mastoid (83–92%), the lowest with the B81 on the forehead (17–22%). The Mini-Shaker elicited lower response rates (65%) compared to results from the literature without coupling force control and compared to ACS (78–87%). Amplitudes were higher for BCV than ACS. ACS and BCV on the mastoid caused higher asymmetry compared to BCV forehead stimulation. The B81 was feasible to elicit VEMPs with mastoid placement and can be used as an approved medical device to measure BCV VEMPs in a clinical set-up. Normative asymmetry values have to be established due to higher variability for mastoid stimulation.

scholarly journals Influence of bone conduction transducer type and placement on ocular and cervical vestibular evoked myogenic potentials

2021 ◽  
Author(s):  
Laura Fröhlich ◽  
Maira Wilke ◽  
Stefan K. Plontke ◽  
Torsten Rahne
Keyword(s):  
Healthy Subjects ◽  
Bone Conduction ◽  
Response Rates ◽  
Normal Subjects ◽  
Vestibular Evoked Myogenic Potentials ◽  
Coupling Force ◽  
Set Up ◽  
Insert Earphones ◽  
Healthy Participants ◽  
Transducer Type

Abstract Purpose: Evaluating the effectiveness of different bone conduction (BC) transducers with controlled coupling force to elicit cervical and ocular vestibular evoked myogenic potentials (cVEMPs, oVEMPs) in healthy subjects by comparing response rates, amplitudes, latencies, thresholds and asymmetry ratios.Methods: Prospective experimental study including healthy participants. VEMPs were measured to different stimulation modes; the BC transducer coupling force was controlled to 5.4 (±0.5) Newton. cVEMPs: to bone conducted vibration (BCV) with the B81 transducer on the mastoid; oVEMPs: to BCV with the B81 on the mastoid, BCV with the B81 on the forehead, and BCV with the Mini-Shaker 4810 on the forehead. Air conducted sound (ACS) with insert earphones was used as reference.Results: Data of 24 normal subjects (mean age 25.3 (± 3.0) years) were analyzed. ACS and BCV with the B81on the mastoid evoked cVEMPs in 100% of ears. The highest oVEMP response rates were obtained with the B81 on the mastoid (83 – 92%), the lowest with the B81 on the forehead (17 – 22%). The Mini-Shaker elicited lower response rates (65%) compared to results from the literature without coupling force control and compared to ACS (78 – 87%). Amplitudes were higher for BCV than ACS. ACS and BCV on the mastoid caused higher asymmetry compared to BCV forehead stimulation.Conclusion: The B81 was feasible to elicit VEMPs with mastoid placement and can be used as an approved medical device to measure BCV VEMPs in a clinical set-up. Normative asymmetry values have to be established due to higher variability for mastoid stimulation.

Cervical Vestibular-Evoked Myogenic Potentials Using Vibration and Sound in Normal Subjects

2011 ◽  
Vol 54 (3) ◽  
pp. 192 ◽  
Author(s):  
Bo Ra Na ◽  
Soo Hee Han ◽  
Eun Jung Ha ◽  
Yeo Jin Lee ◽  
Mun Su Park ◽  
...  
Keyword(s):  
Normal Subjects ◽  
Vestibular Evoked Myogenic Potentials

A rapid, sensitive enzyme-linked immunoassay for human thyrotropin.

1985 ◽  
Vol 31 (7) ◽  
pp. 1131-1134 ◽  
Author(s):  
Y C Tseng ◽  
K D Burman ◽  
J R Baker ◽  
L Wartofsky
Keyword(s):  
Color Change ◽  
Clinical Laboratory ◽  
High Sensitivity ◽  
Normal Subjects ◽  
Turnaround Time ◽  
Cross Reactivity ◽  
Serum Samples ◽  
Assay Sensitivity ◽  
Nitrophenyl Phosphate ◽  
Set Up

Abstract In this enzyme-linked immunoassay for human thyrotropin (TSH) in unextracted serum we use 96-well immunoenzymometric assay plates, first coated with polyclonal antibody to TSH, then incubated with the serum samples and reacted with mouse monoclonal antibody to human TSH. After incubation with alkaline phosphatase-labeled antibody against mouse IgG, disodium p-nitrophenyl phosphate is added and the color change is measured spectrophotometrically. Assay sensitivity is 0.1 milli-int. unit/L. Cross reactivity with lutropin, follitropin, or choriogonadotropin was negligible. TSH concentrations ranged from 0.4 to 4.1 milli-int. units/L in 43 normal subjects (mean 2.0, SD 1.0), and were uniformly less than 0.3 milli-int. unit/L in 23 patients with hyperthyroidism. Features which make this assay advantageous to the clinical laboratory include ease of set-up, ability to assay many samples at a time, high sensitivity, rapid turnaround time (8 h), and absence of requirements for radioactive materials.

REF‐11: A database for references

Online Review ◽  
1986 ◽  
Vol 10 (3) ◽  
pp. 163-164 ◽  
Author(s):  
Maria Faraone
Keyword(s):  
Reference Data ◽  
Set Up ◽  
User Friendly

If you find yourself drowning in reference data, unable to organize information to your satisfaction, REF‐11 may be the package to help you. With REF‐11, users can set up a file of bibliographic references, and search the file. It is quite user friendly. An optional utility ($30) produces bibliographies from the files. A second utility ($25) stores text material in REF‐11 files.

scholarly journals Effects of Self-Generated Noise on Quiet Threshold by Transducer Type in School-Age Children and Adults

2020 ◽  
Vol 63 (6) ◽  
pp. 2027-2033
Author(s):  
Heather L. Porter ◽  
Lori J. Leibold ◽  
Emily Buss
Keyword(s):  
Low Frequency ◽  
Sound Field ◽  
School Age Children ◽  
School Age ◽  
Noise Levels ◽  
Detection Thresholds ◽  
Frequency Detection ◽  
Mild Hearing Loss ◽  
Insert Earphones ◽  
Transducer Type

Purpose Low-frequency detection thresholds in quiet vary across transducers. This experiment tested the hypothesis that transducer effects are larger in young children than adults, due to higher levels of self-generated noise in children. Method Listeners were normal-hearing 4.6- to 11.7-year-olds and adults. Warble-tone detection was measured at 125, 250, 500, and 1000 Hz with a sound-field speaker, insert earphones, and supra-aural headphones. Probe microphone recordings measured self-generated noise levels. Results Thresholds were similar across ages for speaker measurements. Transducer effects were larger for children than adults, with mean child–adult threshold differences at 125 Hz of 3.4 dB (insert earphones) and 6.6 dB (supra-aural headphones). Age effects on threshold were broadly consistent with noise levels measured in the ear canal. Conclusions Self-generated noise appears to elevate children's low-frequency thresholds measured with occluding transducers. These effects could be particularly relevant to the diagnosis of minimal and mild hearing loss in children.

scholarly journals Cross-site investigation on head-related and headphone transfer functions: variabilities in relation to loudness balancing

Acta Acustica ◽  
2021 ◽  
Vol 5 ◽  
pp. 58
Author(s):  
Michael Kohnen ◽  
Florian Denk ◽  
Josep Llorca-Bofi ◽  
Birger Kollmeier ◽  
Michael Vorländer
Keyword(s):  
Transfer Function ◽  
Transfer Functions ◽  
Site Investigation ◽  
Limited Range ◽  
The Difference ◽  
Lower Variability ◽  
Set Up ◽  
Insert Earphones ◽  
High Repeatability ◽  
Cross Site

Headphone transfer function (HpTF) and head-related transfer function (HRTF) measurements are crucial in acoustic science and in binaural virtual acoustic applications. Yet, their measurement set-up, procedure or post-processing is different for nearly every lab, especially for the HRTF measurements. To compare findings between different labs, these measurement deviations have to be quantified alongside with their influence on perceptual aspects. In the scope of a cross-site investigation on loudness balancing between headphone and loudspeaker listening, a set of HpTFs with three different headphones (open, closed, insert earphones) and HRTF close to the eardrum were measured in 14 participants travelling to two different measurement sites at Aachen and Oldenburg. Though set-ups for measuring the HRTF are very different between sites, the gathered HRTFs are quite consistent across them. For the measured HpTFs, across sites the open headphones consistently yield a slightly lower variability in the range from 70 to 5000 Hz than the closed one while the insert earphones exhibit much higher variabilities and a limited range of reproducible results. The difference in loudness balancing across labs could well be predicted by site-specific systematic differences in HpTFs with the exception of 1 kHz narrowband stimulus. This clearly indicates the limits in comparability of HpTFs and loudness balancing across labs and the importance of using headphones with high repeatability like the open ones used in this investigation.

scholarly journals Examination of Insert Ear Interaural Attenuation (IA)Values in Audiological Evaluations

2016 ◽  
Vol 39 (6) ◽  
pp. 82
Author(s):  
Nebi M Gumus ◽  
Merve Gumus ◽  
Selim Unsal ◽  
Mustafa Yuksel ◽  
Mehmet Gunduz
Keyword(s):  
Healthy Subjects ◽  
Bone Conduction ◽  
Hearing Threshold ◽  
Hearing Thresholds ◽  
Bone Conduction Hearing ◽  
Insert Earphones ◽  
Otoscopic Examination

Purpose: The purpose of this study was to evaluate Interaural Attenuation (IA) in frequency base in the insert earphones that are used in audiological assessments. Methods: Thirty healthy subjects between 18-65 years of age (14 female and 16 male) participated in our study. Otoscopic examination was performed on all participants. Audiological evaluations were performed using the Interacoustics AC40 clinical audiometer and ER-3A insert earphones. IA value was calculated by subtracting good ear bone conduction hearing thresholds of the worst airway hearing threshold. Results: In our measuring for 0.125-8.0 kHz frequency were performed in our audiometry device separately for each frequency. IA amount in the results we found in 1000 Hz and below frequencies about 75-110 dB range avarage is 89±5dB, in above 1000 Hz frequencies in 50-95 dB range and avarage it is changed to 69±5dB. Conclusion: According to the obtained findings the quantity of melting in the transition between the ears are increasing with the insert earphones. The insert earphone should be beside supraaural earphone that is routinely used in clinics. Difficult masking applications due to the increase in the value of IA can be easily done with insert earphones.

scholarly journals Case Report: Local Anesthesia Round Window Plugging and Simultaneous Vibrant Soundbridge Implant for Superior Semicircular Canal Dehiscence

2020 ◽  
Vol 11 ◽  
Author(s):  
Giulia Mignacco ◽  
Lorenzo Salerni ◽  
Ilaria Bindi ◽  
Giovanni Monciatti ◽  
Alfonso Cerase ◽  
...  
Keyword(s):  
Semicircular Canal ◽  
Round Window ◽  
Bone Conduction ◽  
Hearing Threshold ◽  
Vestibular Evoked Myogenic Potentials ◽  
Vibrant Soundbridge ◽  
Superior Semicircular Canal Dehiscence ◽  
Superior Semicircular Canal ◽  
The Right ◽  
Canal Dehiscence

The aim of the present study is to report the outcomes of round window reinforcement surgery performed with the application of a Vibrant Soundbridge middle ear implant (VSB; MED-EL) in a patient with superior semicircular canal dehiscence (SSCD) who presented with recurrent vertigo, Tullio phenomenon, Hennebert's sign, bone conduction hypersensitivity, and bilateral moderate to severe mixed hearing loss. Vestibular evoked myogenic potentials (VEMPs) and high-resolution computed tomography (HRCT) confirmed bilateral superior semicircular canal dehiscence while this was not seen in magnetic resonance imaging. The surgical procedure was performed in the right ear as it had worse vestibular and auditory symptoms, a poorer hearing threshold, and greatly altered HRCT and VEMPs findings. With local-assisted anesthesia, round window reinforcement surgery (plugging) with perichondrium was performed with simultaneous positioning of a VSB on the round window niche. At the one and 3 months follow-up after surgery, VSB-aided hearing threshold in the right ear improved to mild, and loud sounds did not elicit either dizziness or pain in the patient.

Vestibular evoked myogenic potentials in response to laterally directed skull taps

2002 ◽  
Vol 12 (1) ◽  
pp. 35-45 ◽  
Author(s):  
Krister Brantberg ◽  
Arne Tribukait
Keyword(s):  
Vestibular Function ◽  
Normal Subjects ◽  
Short Latency ◽  
The Other ◽  
Vestibular Evoked Myogenic Potentials ◽  
Vestibular Loss ◽  
Skin Electrodes ◽  
Function Loss ◽  
Relaxation Responses ◽  
Muscular Responses

In recent years it has been demonstrated that loud clicks generate short latency vestibular evoked myogenic potentials (VEMP). It has also been demonstrated that midline forehead skull tap stimulation evokes similar VEMP. In the present study, the influence of skull tap direction on VEMP was studied in 13 normal subjects and in five patients with unilateral vestibular loss. Gentle skull taps were delivered manually above each ear on the side of the skull. The muscular responses were recorded over both sternocleidomastoid muscles using skin electrodes. Among the normals, laterally directed skull taps evoked “coordinated contraction-relaxation responses”, i.e. skull taps on one side evoked a negative-positive “inverted” VEMP on that side and a positive-negative "normal" VEMP on the other side. Among patients with unilateral vestibular function loss, skull taps above the lesioned ear evoked similar coordinated contraction-relaxation responses. However, skull taps above the healthy ear did not evoke that type of response. These findings suggest that laterally directed skull taps activate mainly the contralateral labyrinth.

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