A discussion on the origin and treatment of noise in industrial environments - Hearing loss due to steady-state noise

1968 ◽  
Vol 263 (1142) ◽  
pp. 273-278 ◽  
Keyword(s):  
Hearing Loss ◽  
Steady State ◽  
Occupational Health ◽  
Working Group ◽  
Continuous Exposure ◽  
Research Committee ◽  
Industrial Environments

This paper is concerned with the formulation of a criterion for the limit of safe noise and a part of the work necessary to establish this limit for the simple case of steady-state noise with continuous exposure during five 8 h working days per week. The investigation is part of the work for a working group of the Research Committee on Occupational Health, T.N.O., Netherlands.

Prediction of Hearing Threshold in Infants Using Auditory Steady-State Evoked Potentials

2002 ◽  
Vol 13 (05) ◽  
pp. 236-245 ◽  
Author(s):  
Gary Rance ◽  
Field Rickards
Keyword(s):  
Hearing Loss ◽  
Steady State ◽  
Hearing Threshold ◽  
Normal Hearing ◽  
Older Children ◽  
Behavioral Thresholds ◽  
Similar Threshold ◽  
Highly Correlated ◽  
The Relationship ◽  
Audiometric Test

This retrospective study examines the relationship between auditory steady-state evoked potential (ASSEP) thresholds determined in infancy and subsequently obtained behavioral hearing levels in children with normal hearing or varying degrees of sensorineural hearing loss. Overall, the results from 211 subjects showed that the two test techniques were highly correlated, with Pearson r values exceeding .95 at each of the audiometric test frequencies between 500 and 4000 Hz. Analysis of the findings for babies with significant hearing loss (moderate to profound levels) showed similar threshold relationships to those obtained in previous studies involving adults and older children. The results for infants with normal or near-normal hearing did, however, differ from those reported for older subjects, with behavioral thresholds typically 10 to 15 dB better than would have been predicted from their ASSEP levels.

The Auditory Steady State Response in Individuals with Neurological Insult of the Central Auditory Nervous System

2007 ◽  
Vol 18 (10) ◽  
pp. 826-845 ◽  
Author(s):  
Jennifer B. Shinn ◽  
Frank E. Musiek
Keyword(s):  
Hearing Loss ◽  
Steady State ◽  
Neurological Impairment ◽  
Control Group ◽  
Steady State Response ◽  
Hearing Sensitivity ◽  
State Response ◽  
Behavioral Thresholds ◽  
Auditory Steady State Response ◽  
Neurological Insult

The auditory steady state response (ASSR) has recently gained attention with respect to estimates of hearing sensitivity and configuration of hearing loss. The present investigation compared behavioral thresholds to estimated ASSR thresholds in subjects with confirmed CANS lesions to determine if this population can be accurately evaluated with ASSR techniques. Comparisons were made between the experimental group and a normal control group matched for age and hearing sensitivity. ASSR thresholds were obtained for the carrier frequencies of 500 and 2000 Hz with a 46 Hz modulation rate and compared to behavioral thresholds. Within and between group comparisons were made. The control group demonstrated strong correlation between their behavioral and estimated ASSR thresholds which significantly contrasted the neurological group. Additionally, individuals with neurological impairment of the CANS exhibited elevated thresholds that were on average 24 dB greater at 2000 Hz than their behavioral thresholds. These results suggest that individuals with neurological insult may appear as hearing impaired or having greater hearing loss than is actually present. As a result, the ASSR may demonstrate the potential to assist in the detection of CANS dysfunction. Las respuestas auditivas de estado estable (ASSR) han ganado atención recientemente con respecto a la estimación de la sensibilidad auditiva y la configuración de la pérdida auditiva. La presente investigación comparó los umbrales conductuales con umbrales estimados por ASSR en sujetos con lesiones CANS confirmadas para determinar si esta población podía ser evaluada con exactitud por medio de técnicas de ASSR. Las comparaciones se realizaron entre el grupo experimental y un grupo control normal ordenados por edad y sensibilidad auditiva. Los umbrales de los ASSR se obtuvieron por medio de frecuencias portadoras de 500 y 2000 Hz, con una tasa de modulación de 46 Hz y se compararon con los umbrales conductuales. Se realizaron comparaciones entre los grupos y dentro de un mismo grupo. El grupo de control mostró una fuerte correlación entre sus umbrales conductuales y los estimados por ASSR, que contrastó significativamente con el grupo neurológico. Adicionalmente, los individuos con un trastorno neurológico de CANS exhibieron umbrales elevados que fueron en promedio 24 dB más alto en 2000 Hz que sus umbrales conductuales. Estos resultados sugieren que los individuos con alteraciones neurológicas pueden lucir como alterados auditivamente o teniendo una pérdida auditiva mayor de la realidad. Como resultados, los ASSR puede demostrar el potencial para ayudar en la detección de la disfunción por CANS.

scholarly journals The effectiveness of the auditory steady state response in diagnosing hearing loss in infants

2002 ◽  
Vol 7 (4) ◽  
Author(s):  
De Wet Swanepoel ◽  
Dunay Schmulian ◽  
René Hugo
Keyword(s):  
Hearing Loss ◽  
Steady State ◽  
Full Text ◽  
Steady State Response ◽  
State Response ◽  
Auditory Steady State Response

This paper aims to provide a review of the emerging Auditory Steady State Response in light of existing procedures for diagnosis of hearing loss in infants. Opsomming Hierdie artikel poog om ‘n oorsig te verskaf van die opkomende Ouditief Standhoudende Respons teenoor huidige prosedures wat gebruik word om gehoorverlies in babas en jong kinders te diagnoseer. *Please note: This is a reduced version of the abstract. Please refer to PDF for full text.

scholarly journals Auditory steady state response in hearing assessment in infants with cytomegalovirus

2013 ◽  
Vol 31 (4) ◽  
pp. 550-553 ◽  
Author(s):  
Daniela Polo C. Silva ◽  
Priscila Suman Lopez ◽  
Jair Cortez Montovani
Keyword(s):  
Hearing Loss ◽  
Steady State ◽  
Hearing Aids ◽  
Otoacoustic Emissions ◽  
Steady State Response ◽  
Case Description ◽  
Congenital Cytomegalovirus ◽  
State Response ◽  
Auditory Steady State Response ◽  
Brainstem Response

OBJECTIVE: To report an infant with congenital cytomegalovirus and progressive sensorineural hearing loss, who was assessed by three methods of hearing evaluation. CASE DESCRIPTION: In the first audiometry, at four months of age, the infant showed abnormal response in Otoacoustic Emissions and normal Auditory Brainstem Response (ABR), with electrophysiological threshold in 30dBnHL, in both ears. With six months of age, he showed bilateral absence of the ABR at 100dBnHL. The behavioral observational audiometry was impaired due to the delay in neuropsychomotor development. At eight months of age, he was submitted to Auditory Steady State Response (ASSR) and the thresholds were 50, 70, absent in 110 and in 100dB, respectively for 500, 1,000, 2,000 and 4,000Hz in the right ear, and 70, 90, 90 and absent in 100dB, respectively for 500, 1,000, 2,000 and 4,000Hz in the left ear. COMMENTS: In the first evaluation, the infant had abnormal Otoacoustic Emission and normal ABR, which became altered at six months of age. The hearing loss severity could be identified only by the ASSR, which allowed the best procedure for hearing aids adaptation. The case description highlights the importance of the hearing status follow-up for children with congenital cytomegalovirus.

scholarly journals Comparison of auditory brainstem response and auditory steady state response audiometry by evaluating the hearing thresholds obtained in children with different severity of hearing loss

2019 ◽  
Vol 35 (2) ◽  
Author(s):  
Muhammad Azeem Aslam ◽  
Adeela Javed ◽  
Abdul Moiz
Keyword(s):  
Hearing Loss ◽  
Steady State ◽  
Auditory Brainstem Response ◽  
Auditory Brainstem ◽  
Steady State Response ◽  
State Response ◽  
Hearing Thresholds ◽  
Auditory Steady State Response ◽  
Brainstem Response ◽  
The Mean

Objectives: To compare the hearing thresholds obtained with auditory brainstem response (ABR) and auditory steady state response (ASSR) audiometry in children with hearing loss. Methods: Hearing thresholds were obtained by ABR and ASSR in children who presented with suspicion of deafness at Ear, nose & throat department of Al-Nafees Medical College Hospital Islamabad, between January to August 2018. The mean hearing thresholds obtained by two tests were compared within each category of severity of deafness. Time taken by both tests was also compared. Results: A total of 57 patients (114 ears) were included in the study. Among them 27 (47.4%) were male and 30 (52.6%) were female. The mean age of patients at presentation was 42 months (±30.9) with age range from one to 12 years. Mean hearing thresholds obtained by click ABR, chirp ABR, ASSR (1, 2, 4 kHz) & ASSR (0.5, 1, 2, 4 kHz) was 56.25 (±27.61), 58.88 (±27.44), 58.03 (±21.26) & 56.35 (±22.86) respectively. Mean thresholds were comparable between click ABR & ASSR (1, 2, 4 kHz) and between chirp ABR & ASSR (0.5, 1, 2, 4 kHz) in all degrees of hearing loss categories except in those patients with normal hearing thresholds. The mean time taken by clicks ABR, chirp ABR and ASSR were four minutes seven seconds, three minutes 15 seconds and 16 minutes and 7 seconds respectively. Conclusions: Hearing thresholds obtained by ABR and ASSR are comparable in all categories of severity of hearing loss. The time taken by ABR is less as compared to ASSR. How to cite this:Aslam MA, Javed A, Moiz A. Comparison of auditory brainstem response and auditory steady state response audiometry by evaluating the hearing thresholds obtained in children with different severity of hearing loss. Pak J Med Sci. 2019;35(2):---------.   doi: https://doi.org/10.12669/pjms.35.2.688 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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