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Hearing Conservation Chapters_ 1, 2, and 3 (1)

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Hearing Conservation Chapters_ 1, 2, and 3 (1)

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  • July 22, 2024
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  • 2023/2024
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Hearing Conservation Chapters: 1, 2, and 3
According to the CDC how many American workers are exposed to hazardous noise on the job?
- ANS-22 million

According to the CEC how many American workers are at risk for hearing loss from agents (e.g.
solvents, metals..)? - ANS-9 million

List the industrial sectors that according to NIOSH have the highest Prevalence of HL - ANS-1.
Mining
2. Quarrying
3. Oil and Gas Extraction
4. Construction
5. Manufacturing

What is the estimated economic impact of disability alone for occupational noise induced
hearing loss in the US per year? - ANS-More than $240 million per year

What is the recognized US authority on training occupational hearing conservationists (OHCs)?
- ANS-Council for Accreditation in Occupational Hearing Conservation (CAOHC)

What is a CAOHC "CD"? - ANS--Course Director
-Credentialed/licensed professional HL prevention specialist in their respective field (Aud,
industrial hygiene, occupational health nurse, otolaryngologist, occupational medicine, noise
control/safety engineer)
-Coordinates and conducts certificate based training for OHCs
-Must complete a 8hr CAOCH workshop (5yr certification)
-May operate independently and conduct certification workshops in private practice or train and
certify OHCs as part of workers HCP

What is a CAOHC "OHC"? - ANS--Occupational Hearing Conservationist
-person most closely involved with noise-exposed workers
-spends extra time with workers to ensure that hearing conservation practices are
communicated and that workers' problems and solutions are given the attention needed
-Credentialed technician who monitors audiometry and works as part of a member in HCPs
- completes course work by CAOHC to earn credential

What is meant by CAOHC "PS"? - ANS--Professional Supervisor
-OHCs must always have a PS
-Defined by federal regulations as licensed or certified: AuD, otolaryngologist, or other physician
-Supervises the OHC's audiometric testing, recommends follow-up procedures, manages the
audiometric database, and determines the work relatedness of a workers HL

, Are OHCs trained to interpret audiograms or diagnose hearing disorders? - ANS-No

Are OHCs trained to conduct bone conduction audiometry or speech audiometry - ANS-No

Tinnitus definition - ANS--Subjective perception of sound
-Ringing in the ears
-Often accompanies both temporary and permanent HL related to noise exposure
-Can also occur in individuals who do not present with elevated thresholds

Hyperacusis Definition - ANS--Sounds perceived as excessively loud
-greatly increased perception of sensitivity to sound that may be a consequence of noise
exposure
-Sounds at intensity levels usually considered acceptable may be experienced as loud,
distorted, painful, or even unbearable
-The range of intensities between which the sound is just perceptible and too loud is very
narrow = reduced DR
-Interferes with understanding of a conversation, tolerance of environmental sounds, and
effective HA use

Acoustic trauma definition - ANS--immediate and permanent HL from a very loud event
-HL may be considered an injury (i.e. a blast)

Continous noise definition - ANS-Noise that last longer than 1 second; also called steady state
noise

Intermittent noise definition - ANS--Noise consisting of differences in sound level throughout the
day along with periodic interruptions of relative quiet between noise periods
-Periods of quiet can allow hearing to recover
-May be less hazardous than continuous noise
-Can cause HL if average exposure is at high average levels and for long enough durations

Impulse noise definition - ANS--Impact noise
-Short bursts of noise lasting less than one second
-HL depends mainly on the level and duration

Temporary threshold shift (TTS) definition - ANS-Temporary reduction in hearing sensitivity after
noise exposure. The elevated hearing thresholds recover after a sufficient period of rest.

Permanent threshold shift (PTS) definition - ANS--Permanent reduction in hearing sensitivity.
-May occur as result of noise exposure
-OHC's job is to identify instances of TTS and intervene in an appropriate manner to avoid PTS

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