HEARING LOSS PREVENTION Presented by Bill Taylor
DID YOU KNOW…...? <ul><li>Noise-induced hearing loss is the number one occupational disability </li></ul><ul><li>It is gen...
HOW DO WE HEAR?
SOUND RECEPTORS
DAMAGED HAIR CELLS
WHAT IS NOISE? <ul><li>Simply stated… noise is any unwanted sound </li></ul>
WAYS TO CHARACTERIZE NOISE <ul><li>FREQUENCY - perceived as pitch </li></ul><ul><li>INTENSITY - perceived as loudness </li...
Noise Induced Hearing Loss <ul><li>Initially, exposure to noise causes a loss of sensitivity to high frequency (high pitch...
HOW CAN IT HAPPEN? <ul><li>ACOUSTIC TRAUMA – ONE TIME EXPOSURE TO LOUD SOUND </li></ul><ul><li>OR </li></ul><ul><li>DAILY ...
HOW DO WE KNOW SOMETHING IS TOO LOUD? <ul><li>Use The Three Foot Rule </li></ul><ul><li>If you have to raise your voice to...
When is noise scientifically defined to be a hazard? <ul><ul><li>Duration of exposure, intensity (volume) of sound, repeat...
Source:coolmath.com & The National Safety Council Threshold of hearing whispering Conversation Car interior Sewing machine...
Steady-State Noise Examples <ul><li>Rustling Leave  20dB </li></ul><ul><li>Conversation  60dB </li></ul><ul><li>Automobile...
Construction Trades Hearing Conservation Percent of workers experiencing hearing loss (by trade). Source: American Society...
Loss of hearing sensitivity due to hazardous noise exposures from either steady state noise or impulse noise does occur ev...
PTS vs. TTS <ul><li>A permanent threshold shift (PTS) vs. a temporary threshold shift (TTS) </li></ul><ul><li>TTS = Bounce...
Permanent Effects of Noise Induced Hearing Loss <ul><li>Difficulty  understanding  conversation, particularly in backgroun...
What is Normal Hearing Range?   <ul><li>A normal listener can hear </li></ul><ul><li>footsteps at 100 meters </li></ul><ul...
BOTTOM LINE <ul><li>If you are exposing yourself to hazardous noise levels unprotected…it’s not a matter of  whether   you...
HEARING PROTECTION <ul><li>The only thing standing between you and a potential permanent hearing loss is </li></ul>HEARING...
But I Can’t Wear Hearing Protection Because…... <ul><li>My ears will become infected </li></ul><ul><li>They hurt my ears <...
Approved Types of HPD’s <ul><li>Earplugs </li></ul><ul><ul><li>Pre-formed </li></ul></ul><ul><ul><li>Hand-formed </li></ul...
NOISE REDUCTION  RATING (NRR) <ul><li>All hearing protection devices have a Noise Reduction Rating (NRR) </li></ul><ul><li...
PRE-FORMED EARPLUGS <ul><li>Single Flange: </li></ul><ul><ul><li>(NRR)=23dB </li></ul></ul><ul><ul><li>5 color-coded sizes...
FITTING TECHNIQUE
PRE-FORMED EARPLUGS <ul><li>Triple Flange: </li></ul><ul><ul><li>NRR= 26dB </li></ul></ul><ul><ul><li>3 color coded sizes:...
FITTING TECHNIQUE
FITTING TECHNIQUE
Characteristics Of A Good Pre-formed Earplug Fit <ul><li>Voices sound muffled </li></ul><ul><li>“ Vacuum” effect </li></ul...
HAND-FORMED EARPLUGS <ul><li>Noise Reduction Rating (NRR)=29dB </li></ul>
Fitting Technique
Circumaural Noise Muffs Noise Reduction Rating (NRR)=23dB
Fitting Technique <ul><li>Noise muffs should seal around the ear </li></ul><ul><li>Replace ear cushions when cracked or wo...
Care and Maintenance of all HEARING PROTECTIVE DEVICES   <ul><li>Keep clean with mild soap and water and dry before using ...
One more time…When do I need to wear protection?     <ul><li>Steady state noise measured at 85dBA or greater </li></ul><ul...
Are HPDs always enough? <ul><li>Some work place noise exposure may exceed the protection offered by HPDs </li></ul><ul><li...
OTHER PROTECTIVE MEASURES <ul><li>Administrative Controls </li></ul><ul><li>Double protection </li></ul><ul><li>Medical in...
ADMINISTRATIVE CONTROLS <ul><li>Limit exposure time by implementing shift work schedules  </li></ul>
DOUBLING UP! <ul><li>Steady state noises 120dBA or greater </li></ul><ul><li>Use of insert earplugs and circumaural earmuf...
Medical Research ( on the horizon) <ul><li>Hazardous exposure initiates inner ear oxidative process which results in hair ...
Listening through HPDs takes practice but the threshold shift caused from wearing them is temporary…the shift caused from ...
TO SUMMARIZE…… <ul><li>HEARING LOSS HAPPENS! </li></ul><ul><li>Noise induced hearing loss is 100% </li></ul><ul><li>Preven...
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Hearing Loss Prevention

  1. 1. HEARING LOSS PREVENTION Presented by Bill Taylor
  2. 2. DID YOU KNOW…...? <ul><li>Noise-induced hearing loss is the number one occupational disability </li></ul><ul><li>It is generally painless </li></ul><ul><li>It is progressive over time </li></ul><ul><li>It is permanent </li></ul><ul><li>IT IS PREVENTABLE!!! </li></ul>THE 4 PS
  3. 3. HOW DO WE HEAR?
  4. 4. SOUND RECEPTORS
  5. 5. DAMAGED HAIR CELLS
  6. 6. WHAT IS NOISE? <ul><li>Simply stated… noise is any unwanted sound </li></ul>
  7. 7. WAYS TO CHARACTERIZE NOISE <ul><li>FREQUENCY - perceived as pitch </li></ul><ul><li>INTENSITY - perceived as loudness </li></ul><ul><li>NATURE - steady-state vs. impulse/impact </li></ul><ul><li>DURATION - length of time exposed </li></ul>
  8. 8. Noise Induced Hearing Loss <ul><li>Initially, exposure to noise causes a loss of sensitivity to high frequency (high pitch) sound. </li></ul><ul><li>Continued exposure results in damage to mid frequency region as well. </li></ul><ul><li>One can experience progressive high frequency hearing loss and not be aware of it until it becomes severe (doesn’t affect loudness perception). </li></ul>
  9. 9. HOW CAN IT HAPPEN? <ul><li>ACOUSTIC TRAUMA – ONE TIME EXPOSURE TO LOUD SOUND </li></ul><ul><li>OR </li></ul><ul><li>DAILY EXPOSURES TO MODERATELY LOUD SOUNDS </li></ul>
  10. 10. HOW DO WE KNOW SOMETHING IS TOO LOUD? <ul><li>Use The Three Foot Rule </li></ul><ul><li>If you have to raise your voice to be heard by someone standing within 3 foot (arm’s length) then the level is most likely above the hazardous noise level </li></ul><ul><li>or </li></ul><ul><li>Objectively measure loudness with proper equipment </li></ul>
  11. 11. When is noise scientifically defined to be a hazard? <ul><ul><li>Duration of exposure, intensity (volume) of sound, repeated exposure, individual susceptibility </li></ul></ul><ul><ul><li>85dBA for steady-state noise sources </li></ul></ul><ul><ul><li>140dBP for impulse/impact noise sources </li></ul></ul>
  12. 12. Source:coolmath.com & The National Safety Council Threshold of hearing whispering Conversation Car interior Sewing machine Busy Traffic Screaming Child Diesel Truck Jack hammer Air drill Lawn mower Helicopter Snowmobile Inboard motorboat Sand blaster Fender amp @ 10” Auto horn Propeller aircraft Trumpet peak @ 5” Gun Shot Jet engine Rocket launch Everyday noise and recommended maximum exposure levels. A 5 dB reduction is about 30% quieter and is a 50% decrease in the risk! deciBel
  13. 13. Steady-State Noise Examples <ul><li>Rustling Leave 20dB </li></ul><ul><li>Conversation 60dB </li></ul><ul><li>Automobile 70dB </li></ul><ul><li>Alarm Clock 80dB </li></ul><ul><li>Screaming Child 90dB </li></ul><ul><li>Pneumatic Drill 100dB </li></ul><ul><li>Helicopter 110dB </li></ul><ul><li>Live Concert 130dB </li></ul>
  14. 14. Construction Trades Hearing Conservation Percent of workers experiencing hearing loss (by trade). Source: American Society of Safety Engineers
  15. 15. Loss of hearing sensitivity due to hazardous noise exposures from either steady state noise or impulse noise does occur even before we can measure the change!…. And it does carry negative consequences!!! When Does it Happen
  16. 16. PTS vs. TTS <ul><li>A permanent threshold shift (PTS) vs. a temporary threshold shift (TTS) </li></ul><ul><li>TTS = Bounce-back effect…not complete recovery </li></ul><ul><li>PTS = Immediate medical referral (Audiology or ENT) </li></ul>
  17. 17. Permanent Effects of Noise Induced Hearing Loss <ul><li>Difficulty understanding conversation, particularly in background noise…high frequency hearing loss affects ability to hear consonants. Quality of environmental sound is diminished. </li></ul><ul><li>” Ringing in Ears” - tinnitus </li></ul>
  18. 18. What is Normal Hearing Range? <ul><li>A normal listener can hear </li></ul><ul><li>footsteps at 100 meters </li></ul><ul><li>voices at 180 meters </li></ul><ul><li>Person with hearing loss </li></ul><ul><li>footsteps at < 1 meter </li></ul><ul><li>voices at 32 meters </li></ul>
  19. 19. BOTTOM LINE <ul><li>If you are exposing yourself to hazardous noise levels unprotected…it’s not a matter of whether you will develop hearing loss but when you will develop hearing </li></ul>
  20. 20. HEARING PROTECTION <ul><li>The only thing standing between you and a potential permanent hearing loss is </li></ul>HEARING PROTECTION PPE
  21. 21. But I Can’t Wear Hearing Protection Because…... <ul><li>My ears will become infected </li></ul><ul><li>They hurt my ears </li></ul><ul><li>I can’t hear to do my job </li></ul><ul><li>I can’t hear sounds needed to hunt, etc., etc. </li></ul><ul><li>Thinking short-term instead of long-term </li></ul>
  22. 22. Approved Types of HPD’s <ul><li>Earplugs </li></ul><ul><ul><li>Pre-formed </li></ul></ul><ul><ul><li>Hand-formed </li></ul></ul><ul><li>Noise Muffs </li></ul><ul><li>Helmets </li></ul>
  23. 23. NOISE REDUCTION RATING (NRR) <ul><li>All hearing protection devices have a Noise Reduction Rating (NRR) </li></ul><ul><li>Field testing suggests that the actual NRR is approximately half of what is listed on the package </li></ul>
  24. 24. PRE-FORMED EARPLUGS <ul><li>Single Flange: </li></ul><ul><ul><li>(NRR)=23dB </li></ul></ul><ul><ul><li>5 color-coded sizes: </li></ul></ul><ul><ul><ul><li>White (Extra Small)- 10% </li></ul></ul></ul><ul><ul><ul><li>Green (Small)- 25% </li></ul></ul></ul><ul><ul><ul><li>Orange (Medium)-30% </li></ul></ul></ul><ul><ul><ul><li>Blue (Large)- 40% </li></ul></ul></ul><ul><ul><ul><li>Red (Extra Large)- 25% </li></ul></ul></ul>
  25. 25. FITTING TECHNIQUE
  26. 26. PRE-FORMED EARPLUGS <ul><li>Triple Flange: </li></ul><ul><ul><li>NRR= 26dB </li></ul></ul><ul><ul><li>3 color coded sizes: </li></ul></ul><ul><ul><ul><li>Green (Small)= 10% </li></ul></ul></ul><ul><ul><ul><li>Orange (Medium)=80% </li></ul></ul></ul><ul><ul><ul><li>Blu e (Large)= 30% </li></ul></ul></ul>
  27. 27. FITTING TECHNIQUE
  28. 28. FITTING TECHNIQUE
  29. 29. Characteristics Of A Good Pre-formed Earplug Fit <ul><li>Voices sound muffled </li></ul><ul><li>“ Vacuum” effect </li></ul><ul><li>Comfortable </li></ul><ul><li>Single flange tab facing toward back of ear </li></ul><ul><li>Largest flange of triple flange is flush against ear canal opening </li></ul>
  30. 30. HAND-FORMED EARPLUGS <ul><li>Noise Reduction Rating (NRR)=29dB </li></ul>
  31. 31. Fitting Technique
  32. 32. Circumaural Noise Muffs Noise Reduction Rating (NRR)=23dB
  33. 33. Fitting Technique <ul><li>Noise muffs should seal around the ear </li></ul><ul><li>Replace ear cushions when cracked or worn </li></ul><ul><li>Certain types of muffs allow placement of the headband on top of the head, behind the head, or under the chin </li></ul>
  34. 34. Care and Maintenance of all HEARING PROTECTIVE DEVICES <ul><li>Keep clean with mild soap and water and dry before using </li></ul><ul><li>Replace when material hardens/cracks or does not clean </li></ul><ul><li>Check for cracks on earphone seals, headband tension and replace as needed </li></ul>
  35. 35. One more time…When do I need to wear protection? <ul><li>Steady state noise measured at 85dBA or greater </li></ul><ul><li>Impulse noise measured at 140dBA or greater </li></ul>
  36. 36. Are HPDs always enough? <ul><li>Some work place noise exposure may exceed the protection offered by HPDs </li></ul><ul><li>Permanent damage can be minimized with HPD use </li></ul>
  37. 37. OTHER PROTECTIVE MEASURES <ul><li>Administrative Controls </li></ul><ul><li>Double protection </li></ul><ul><li>Medical intervention??? </li></ul>
  38. 38. ADMINISTRATIVE CONTROLS <ul><li>Limit exposure time by implementing shift work schedules </li></ul>
  39. 39. DOUBLING UP! <ul><li>Steady state noises 120dBA or greater </li></ul><ul><li>Use of insert earplugs and circumaural earmuffs together </li></ul>
  40. 40. Medical Research ( on the horizon) <ul><li>Hazardous exposure initiates inner ear oxidative process which results in hair cell death cycle </li></ul><ul><li>New medication may be able to limit permanent damage by arresting oxidative process </li></ul><ul><li>Time sensitive </li></ul><ul><li>NOT A SUB FOR HPDs! </li></ul>
  41. 41. Listening through HPDs takes practice but the threshold shift caused from wearing them is temporary…the shift caused from not protecting yourself could be permanent!!!!
  42. 42. TO SUMMARIZE…… <ul><li>HEARING LOSS HAPPENS! </li></ul><ul><li>Noise induced hearing loss is 100% </li></ul><ul><li>Preventable </li></ul><ul><li>Your hearing health starts with YOU while at work or home </li></ul><ul><li>If YOU don’t protect it YOU will lose it </li></ul>

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