Block #5 hearing

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Bio responsibilities

Assess hazards, worksite visits, complete noise surveys and audiometric test environment

AF form 1753

Audiometric case history

Receiver

Auditory mechanism to receive and interpret the signal

Sender

The source of vibration and the source of energy needed to initiate vibration

Frequency

The speed at which sound vibrates determines it (blank) and pitch

Who must Be motivated to take the steps necessary to Preserve their hearing health

The worker

Microprocessor Audiometer

"Standalone" audiometer that uses a microchip controlled program to automatically present test tones

What calibration test are performed by MERC

Annual electroacoustic calibration and biannual exhausted calibration

What are the three types of calibration

Annual electroacoustic calibration, biannual exhaustive calibration, Daily biological calibration checks

Rising configuration

Are not caused by noise and are typically conducted in nature

Electrocoustic ear (bio joe)

Artificial ear is used to verify calibration status of the audio meter during biological calibration checks

Normal hearing

Is considered to be any threshold below 25 dB. 0 dB is considered to be the average best hearing

Noise

Is considered to be unwanted sound

Noise dose

Is the % of an allowable noise exposure the worker experiences through the work day.

Decibel exchange rate

Is the amount of (blank) increase/decrease in the noise exposure causing the noise dose to double

bone conduction

Masking are parts of the diagnostic evaluation performed by audiologist To prevent cross over

Mil-STD 1474

Maximum noise limits

5 auditory effects of noise

TTS- temporary threshold shift PTS- permanent threshold shift Social withdrawal Tinnitus Hyperausis

Command level players responsibilities

Developing policies and allocating resources to facilitate effective programs

Lighted ear inspection test are performed when

Prior to all audiometric test and hearing protective device fittings

The human ear is sensitive to frequencies as low as (blank) and as high as (blank)

20Hz and 20,000Hz

NIOSH uses a (blank) exchange rate

3dBA

The range intensity range for human ears are?

0-140dB

The human ear is most sensitive to sounds in the range of (blank) to (blank)

1000 Hz to 4000Hz

BE is responsible for what two of the five elements in ACMED?

A (noise assessment) and C (noise control)

sound level meter

A device that uses a microphone and basic electronic processing to measure and convert the pressure fluctuations.

OSHA 29 CRF 1910.95

A regulation regarding hearing conservation states all programs must limit noise exposure

Sounds waves

A series of compressions and rarefactions make up a sounds wave producing a series of alternating areas of high and low pressure

Serial Audiogram

Air conduction threshold numberically

Supervisor responsibilities

All new personnel in noise hazardous duty are trained by PH, fitted for HPD, baseline audiogram

Mini booth

Best in environments with BGN of <65 dBA during The busiest part of the day

Who determines if a shop needs double hearing protection

Bio environmental engineering

vestibular system

Carries signals from Oregon to brain

Central auditory system

Carries signals from hearing and balance from inner ear through the brain Stem to the brain

Medium

Carries the pressure change

What parts make up the inner ear

Cochlea and vestibular system

pinna function

Collect sound and direct to ear canal

Complex tones

Combination of sound waves with a mix of frequencies

Hierarchy of controls

Component used to determine which control solutions are most feasible and effective

SF 600 (Chronological Record of Medical Care)

Date, type of HPD, brand and noise attenuation provided and resulted noise level

Graphic Audiograms

Displayed on a chart using symbols to identify thresholds

double distance away from the sound sources

Doubling the distance from a sound source this intensity of the exposure will decrease by 6 dB (inverse law)

Types of hearing protective devices

Ear plugs, ear muffs, branded hearing Protectors, non-standard devices/special protectors, Double hearing protection

Reference Audiogram

Employees best hearing and serve as baseline for future comparisons recorded on DD form 2215

Engineering controls

First choice to reduce Hazardous noise exposure existing in the workplace

Personal requiring audiometric monitoring

For workers with routine exposure to 85 dBA 8hrs or 140 dBA/Ultrasonic exposure

What are calibrated to a specific audio meter and must Not be interchanged with another device without recalibrating

Headphones

Manual Audiometer

Gives the operator the ability to focus on Problem frequencies that the patient might be consistently missing

sensorineural hearing loss

Hair cells in the cochlea or nerve pathway to the brain are damaged and or lost, Typically permanent and untreatable

Sound

Is a sensation that results from stimulation of the auditory mechanism

Unilateral hearing loss

Hearing loss that occurs in only one ear

The 3 ft role

If you need to shout to be understood from 3 ft away it's a potential hazard

DODi 6055.7

Implements OHSA reports and requirements for DOD

Intensity

Loudness/ volume/ amplitude

Ossicle chain

Malleus, incus, stapes

Compression

Molecules are forced together causing an area of high pressure

Employees Responsibilities

Must comply with all recommend noise control measures

Non-organic hearing loss

No medical or physical reason for the loss

5 elements of AF hearing conservation program

Noise assessment Noise control Audiometric monitoring Education Disposition

Occupational noise

Noise source that exist in the workplace

Hearing conservation directives

OSHA- 29 CFR 1910.95 DODI- 6055.12 AFI 48-127

Conductive hearing loss

Pathway of sound is block in the inner ear and the middle ear some loss of hearing will occur

cochlea function

Snail like structure Embedded deeply in the temporal bone of the skull

Who is responsible for initial earplug fitting during referral audiogram

Public health

Who is responsible for training personnel on the proper use and care of hearing protective devices at the time of audiometric testing

Public health

What is the goal for noise assessment

Quantify the workers noise exposure and determine health risk caused by these exposures

AFI 48-127

Quantifying noise hazards (Bios responsibility)

Non-occupational noise

Recreational noise that can come sources such as hunting (outside of the workplace)

Purpose for HPD

Reduce noise exposure at the ear of the worker

AFI 48-127

Regulates noise exposure limits and est. responsibilities for noise evaluation and control

OEHWG responsibilities

Review all occ. exposures, determine what type of test should be required to monitor workers exposure

Occ. Health consultant responsibilities

Review audiograms and determine employees hearing loss is work related

DODi 6055.1

SOH metrics as PTS rates DOD personnel

What are the 3 requirements for sound

Sender, medium, receiver

tympanic membrane function

Separate outer ear from the inner. Vibrates in response to acoustic energy

Pure tones

Simplest form of sound and represents one frequency

Vibration

Sound creates vibration it causes alternate pressure changes in the air molecules surrounding it.

Tinnitus

Sounds in the ear or head without an external source

Mobile booths

Sounds treated enclosed with Van, bus or trailer

Time weighted average

The amount of the time a worker is exposed to hazardous noise over the work day-8hrs

sloping configuration

The most common audiometric pattern especially for those who work in Noise and are getting older

The best HPD what?

The one the worker will wear correctly

Mixed hearing loss

The person that has a combination of conductive and sensorineural loss

Standard booth

They have heavier walls and more storable for areas where BGN levels are 65-79 dBA 3-4in walls

What is the goal for establishing threshold

To find the softest decimal level a person is able to hear

What is the main purpose of NRR Noise reduction rating

To help the customer choose the right brand/style of HP Des from a variety of options

Periodic audiogram

To identify early changes in hearing by comparing the most great audiogram to a valid reference audio gram to calculate threshold shifts and determine if Intervention is needed documented on DD form 2216

Mission of hearing conservation

To prevent noise induced hearing loss

What is the purpose for the lighted ear inspection

To rule out any abnormalities that would affect a subject ability to receive audiometric testing

DODi 6055.12

Tri-serivce that mandates each service meets guidelines and develops service specific regulations

What parts make up the middle ear

Tympanic membrane, malleus, incus, stapes, eustanchian Membrane

Hand Switch

Used by the listener to indicate a response

non-organic hearing loss

Usually indicates a conductive hearing loss caused by infection chronic allergies or TM abnormalities

Rarefaction

When Molecules separate for each-other causing an area of low pressure

Double hearing Protection is required when

With any noise with a TWA greater than 100 dBA

Administrative controls

Worker rotation to remove noise exposed workers out of noisy areas to revent them from reaching PELs

Amplification

Workers with existing hearing loss may be fitted with hearing aids to help remedy the loss but hearing aids cannot restore normal hearing

Asymmetric hearing loss

hearing loss occurs in both ears But one is significantly worse

Hyperacusis

increased sensitivity to sound

What part makes up the outer ear

pinna


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