PRACTICE POINTS
Characteristics of chronic, occupational Noise Induced Hearing
Loss:
-
sensorineural
- bilateral and symmetrical
- rarely profound
- non-progressive when noise stopped
- rate of loss decreases as threshold increases
- frequencies affected:
a. 3-6kHz more than lower frequencies
b. 4kHz most affected
- maximal losses typically after 10-15 years
- continuous noise more damaging than intermittent
Tinnitus
is very common in the general population and Causation by acoustic injury
must be considered in context of the accompanying Noise Induced Hearing
Loss
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