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acoustic trauma

the effect of a single exposure to a transient, high-intensity sound or it is generically used to describe the effect of excessive acoustic exposure

sensorineural hearing loss

loss due to outer or inner hair cell damage to the cochlea

noise-induced hearing loss

2nd most common cause of sensorineural hearing loss

Noise-Induced Hearing Loss

when excessive sound produces a threshold shift

temporary Threshold Shift

sensitivity of sound has gotten poorer for a short period of time

Permanent Threshold shift

Can occur from a single exposure when there are excessive pressure waves/gradually with repeated exposure

Permanent Threshold shift

hearing never goes back

Permanent Threshold shift

hair cells are too exhausted to replenish themselves, die off

Outer hair cell

higher frequency

Outer hair cell loss

can be due to metabolic changes and cell exhaustion. Affected first

Occupational Safety and Health Act

establishes guidelines to protect workers OSHA

160 dB

ruptured eardrum

125 dB


90 dB

(8-hr average) permanent hearing loss in approx. 25% of repeatedly exposed workers

85 dB

(8-hr average) permanent hearing loss in approx. 8% of repeatedly exposed workers

75-84 dB

(8-hr average) minor hearing loss may develop in repeatedly exposed workers with sensitive hearing


medical name for ringing in ears

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