scholarly journals Normative Hearing Threshold Levels in Koreans with Normal Tympanic Membranes and Estimated Prevalence of Hearing Loss

2017 ◽  
Vol 10 (2) ◽  
pp. 129-136 ◽  
Author(s):  
Hong Ju Park ◽  
Myung Hoon Yoo ◽  
Sun Young Baek ◽  
Seon Woo Kim ◽  
Yang-Sun Cho
Keyword(s):  
Hearing Loss ◽  
Hearing Threshold ◽  
Threshold Levels ◽  
Tympanic Membranes

Hearing loss associated with weapons noise exposure: when to investigate an asymmetrical loss

1995 ◽  
Vol 109 (4) ◽  
pp. 291-295 ◽  
Author(s):  
H. J. Cox ◽  
G. R. Ford
Keyword(s):  
Hearing Loss ◽  
Noise Exposure ◽  
Hearing Threshold ◽  
Routine Testing ◽  
Threshold Levels ◽  
Average Loss ◽  
The Right ◽  
Air Conduction ◽  
Selection Of

AbstractThe air conduction thresholds in the right and left ears, and the interaural asymmetry of thresholds at 0.5, 1, 2, 3, 4 and 6 kHz were measured in a group of 225 soldiers exposed to a variety of weapon noise who were referred for assessment because of a deterioration in hearing on routine testing. At 0.5 and I kHz the threshold levels rarely exceeded 25 dB and the interaural asymmetry was 10 dB or less in 90 per cent of cases. The degree of hearing loss and interaural asymmetry increased as the frequency increased, with the average loss being significantly greater in the left ear at 2, 3, 4 and 6 kHz.Recommendations are made for the selection of cases of asymmetrical hearing loss exposed to weapon noise which require further investigation to exclude a retrocochlear cause or to define spurious hearing threshold levels.

AN OBSERVATIONAL STUDY OF HEARING THRESHOLDS IN PROFESSIONAL DRIVERS

2021 ◽  
pp. 49-51
Author(s):  
R. Shanthimalar ◽  
R. Bhuvaneswari ◽  
V. Sumathi
Keyword(s):  
Hearing Loss ◽  
Tamil Nadu ◽  
Pure Tone ◽  
Hearing Threshold ◽  
Pure Tone Audiometry ◽  
P Value ◽  
Professional Drivers ◽  
Threshold Levels ◽  
Hearing Thresholds ◽  
The Right

Introduction: Noise has become a very important stress factor in the environment. Drivers are the most commonly affected persons due to trafc noise. The majority of drivers remain unaware about noise induced hearing loss as this is an insidious process, leading to temporary or permanent hearing impairment, but preventable. Pure Tone audiometric test is used to determine the degree of hearing loss in noise exposed individuals. Aim & Objective: To nd the hearing threshold levels for high and mid frequency sounds for both ears in Professional drivers. To evaluate the preponderance of hearing loss between right and left ear using hearing thresholds. Materials & Methods: This study was conducted in 100 Professional male drivers aged between 30-40 years who are working in Tamil Nadu State Transport Corporation, Madurai. Pure tone audiometry was used to measure the high and mid frequency hearing threshold levels in both ears. Results: The mean (SD) hearing threshold for high and mid frequency sounds was signicantly higher in left ear comparative to right ear with P value < 0.05. The statistically signicant difference in hearing loss was observed between both ears. Conclusion : Our study showed statistically signicant higher hearing threshold for high and mid frequency sounds in left ear compared to right ear, that concludes left ear is more prone for hearing loss than the right ear

Noise-Induced Hearing Loss in Professional Orchestral Musicians

2013 ◽  
Vol 38 (2) ◽  
pp. 223-234 ◽  
Author(s):  
Małgorzata Pawlaczyk-Łuszczyńska ◽  
Małgorzata Zamojska ◽  
Adam Dudarewicz ◽  
Kamil Zaborowski
Keyword(s):  
Hearing Loss ◽  
High Frequency ◽  
Noise Exposure ◽  
Hearing Threshold ◽  
Noise Induced Hearing Loss ◽  
Occupational Risk Factors ◽  
Threshold Levels ◽  
Exposed Population ◽  
Orchestral Musicians ◽  
The Impact

Abstract The overall purpose of this study was to assess hearing status in professional orchestral musicians. Standard pure-tone audiometry (PTA) and transient-evoked otoacoustic emissions (TEOAEs) were per- formed in 126 orchestral musicians. Occupational and non-occupational risk factors for noise-induced hearing loss (NIHL) were identified in questionnaire inquiry. Data on sound pressure levels produced by various groups of instruments were also collected and analyzed. Measured hearing threshold levels (HTLs) were compared with the theoretical predictions calculated according to ISO 1999 (1990). Musicians were exposed to excessive sound at weekly noise exposure levels of for 81-100 dB (mean: 86.6±4.0 dB) for 5-48 years (mean: 24.0±10.7 years). Most of them (95%) had hearing corresponds to grade 0 of hearing impairment (mean hearing threshold level at 500, 1000, 2000 and 4000 Hz lower than 25 dB). However, high frequency notched audiograms typical for noise-induced hearing loss were found in 35% of cases. Simultaneously, about 35% of audiograms showed typical for NIHL high frequency notches (mainly occurring at 6000 Hz). When analyzing the impact of age, gender and noise exposure on hearing test results both PTA and TEOAE consistently showed better hearing in females vs. males, younger vs. older musicians. But higher exposure to orchestral noise was not associated with poorer hearing tests results. The musician’s audiometric hearing threshold levels were poorer than equivalent non-noise-exposed population and better (at 3000 and 4000 Hz) than expected for noise-exposed population according to ISO 1999 (1990). Thus, music impairs hearing of orchestral musicians, but less than expected from noise exposure.

scholarly journals The Effect of Exposure to Noise during Military Service on the Subsequent Progression of Hearing Loss

2021 ◽  
Vol 18 (5) ◽  
pp. 2436
Author(s):  
Brian C. J. Moore
Keyword(s):  
Hearing Loss ◽  
Longitudinal Studies ◽  
Military Service ◽  
Noise Exposure ◽  
Hearing Threshold ◽  
Wide Frequency Range ◽  
Frequency Range ◽  
Threshold Levels ◽  
Wide Range ◽  
High Level

This paper reviews and re-analyses data from published studies on the effects of noise exposure on the progression of hearing loss once noise exposure has ceased, focusing particularly on noise exposure during military service. The data are consistent with the idea that such exposure accelerates the progression of hearing loss at frequencies where the hearing loss is absent or mild at the end of military service (hearing threshold levels (HTLs) up to approximately 50 dB HL), but has no effect on or slows the progression of hearing loss at frequencies where the hearing loss exceeds approximately 50 dB. Acceleration appears to occur over a wide frequency range, including 1 kHz. However, each of the studies reviewed has limitations. There is a need for further longitudinal studies of changes in HTLs over a wide range of frequencies and including individuals with a range of HTLs and ages at the end of military service. Longitudinal studies are also needed to establish whether the progression of hearing loss following the end of exposure to high-level sounds depends on the type of noise exposure (steady broadband factory noises versus impulsive sounds).

A Comparison of Conventional and In-Situ Audiometry on Participants with Varying Levels of Sensorineural Hearing Loss

2015 ◽  
Vol 26 (01) ◽  
pp. 068-079 ◽  
Author(s):  
Jürgen Kiessling ◽  
Melanie Leifholz ◽  
Steffen Unkel ◽  
Jörn Pons-Kühnemann ◽  
Charlotte Thunberg Jespersen ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Sensorineural Hearing Loss ◽  
Research Design ◽  
Hearing Aids ◽  
Hearing Aid ◽  
Hearing Threshold ◽  
Sensorineural Hearing ◽  
Threshold Levels ◽  
Wide Range

Background: In-situ audiometry is a hearing aid feature that enables the measurement of hearing threshold levels through the hearing instrument using the built-in sound generator and the hearing aid receiver. This feature can be used in hearing aid fittings instead of conventional pure-tone audiometry (PTA), particularly in places where no standard audiometric equipment is available. Differences between conventional and in-situ thresholds are described and discussed for some particular hearing aids. No previous investigation has measured and compared these differences for a number of current hearing aid models by various manufacturers across a wide range of hearing losses. Purpose: The purpose of this study was to perform a model-based comparison of conventionally and in-situ measured hearing thresholds. Data were collected for a range of hearing aid devices to study and generalize the effects that may occur under clinical conditions. Research Design: Research design was an experimental and regression study. Study Sample: A total of 30 adults with sensorineural hearing loss served as test persons. They were assigned to three subgroups of 10 subjects with mild (M), moderate to severe (MS), and severe (S) sensorineural hearing loss. Intervention: All 30 test persons underwent both conventional PTA and in-situ audiometry with four hearing aid models by various manufacturers. Data Collection and Analysis: The differences between conventionally and in-situ measured hearing threshold levels were calculated and evaluated by an exploratory data analysis followed by a sophisticated statistical modeling process. Results: At 500 and 1500 Hz, almost all threshold differences (conventional PTA minus in-situ data) were negative, i.e., in the low to mid frequencies, hearing loss was overestimated by most devices relative to PTA. At 4000 Hz, the majority of differences (7 of 12) were positive, i.e., in the frequency range above 1500 Hz, hearing loss was frequently underestimated. As hearing loss increased (M→MS→S), the effect of the underestimation decreased. At 500 and 1500 Hz, Resound devices showed the smallest threshold deviations, followed by Phonak, Starkey, and Oticon instruments. At 4000 Hz, this observed pattern partly disappeared and Starkey and Oticon devices showed a reversed effect with increasing hearing loss (M→MS→S). Because of high standard errors for the estimates, only a few explicit rankings of the devices could be established based on significant threshold differences (5% level). Conclusions: Differences between conventional PTA and in-situ threshold levels may be attributed to (1) frequency, (2) device/hearing loss, and (3) calibration/manufacturer effects. Frequency effects primarily resulting in an overestimation of hearing loss by in-situ audiometry in the low and mid frequencies are mainly due to sound drain-off through vents and leaks. Device/hearing loss effects may be due to leakage as well as boundary effects because in-situ audiometry is confined to a limited measurement range. Finally, different calibration approaches may result in different offset levels between PTA and in-situ audiometry calibration. In some cases, the observed threshold differences of up to 10–15 dB may translate to varied hearing aid fittings for the same user depending on how hearing threshold levels were measured.

The effect of altitude on absolute hearing threshold levels

1982 ◽  
Author(s):  
I. B. Mekjavic ◽  
D. Sinclair ◽  
D. Steele ◽  
N. S. Longridge
Keyword(s):  
Hearing Threshold ◽  
Threshold Levels

The Characteristics of Tinnitus and Hearing Threshold - In Workers with Noise Induced Hearing Loss from a Hospital Setting -

2012 ◽  
Vol 24 (4) ◽  
pp. 431
Author(s):  
Nam-Jeong Kim ◽  
Hyoung-Ouk Park ◽  
Chang-Sun Sim ◽  
Choong-Ryeol Lee ◽  
Young-Joo Kwon ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Hearing Threshold ◽  
Hospital Setting ◽  
Noise Induced Hearing Loss

scholarly journals Monitoring of the auditory pathway maturation after early intervention during the first year of life in infants with sensorineural hearing loss

2020 ◽  
Author(s):  
F. Matin ◽  
S. Haumann ◽  
W. Roßberg ◽  
D. Mitovska ◽  
T. Lenarz ◽  
...  
Keyword(s):  
Hearing Loss ◽  
Early Intervention ◽  
Hearing Aids ◽  
Hearing Threshold ◽  
Auditory Pathway ◽  
Auditory Brainstem Responses ◽  
First Year ◽  
Early Therapy ◽  
Hearing Thresholds ◽  
First Year Of Life

Abstract Purpose The objective of this study was to investigate the auditory pathway maturation monitored by auditory brainstem responses (ABR) in infants with hearing loss during the first year of life. ABR were used to estimate hearing thresholds and the effect of early intervention strategies using hearing aids (HA). Methods Click-evoked ABRs were measured in 102 infants aged from 0 to 12 months to determine their individual auditory threshold. Early therapy intervention was recommended before 12 months of age and analyzed. To evaluate the effect of hearing amplification on auditory maturation, different subgroups of infants with moderate hearing loss were analyzed and the auditory pathway maturation was determined based on IPL I–V shortening. Results Overall, 110 ears (54.0% of 204 ears) with mild to profound HL showed threshold changes of 10 dB up to 60 dB in the follow-up ABR testing. HA were prescribed at the age of 3.8 ± 3.9 months. Cochlear implantation (CI) was performed in cases of repeated profound HL at the age of 9.9 months ± 4.5 months. A significant shortening of IPL I–V in all subgroups of infants (with and without risk factors) who received HA was shown and assumed auditory pathway maturation. Conclusion An early intervention using optimally fitted HA influenced auditory pathway maturation and may lead to improvements of hearing thresholds during the first year of life in infants. This study underscores the importance of not only providing HAs to infants, but also controlling for hearing threshold changes ensuring that HAs provide the optimal level of intervention or CI is indicated.

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.

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