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Noise Induced Hearing Loss Webinar Series: Making the Case for Custom

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1.  Which of the following tenets of a Hearing Loss Prevention Program are known to be the most effective at preventing hearing loss but often the most difficult to implement? Noise survey Audiometric monitoring Education and motivation hearing protection devices

2.  What is the effect of a slit-leak of an earplug that is not snuggly fitting in the ear canal? Increased attenuation in the high frequencies Loss of attenuation in the low frequencies Loss of attenuation in the high frequencies Increased attenuation in the low frequencies

3.  What manufacturing modification can be used to manage the occlusion effect in custom hearing protection devices that cannot be managed in non-custom devices? Ear canal portion of the sleeve extended to or past the 2nd bend Ear canal portion shortened to no deeper than the 1st bend Full shell rather than canal only, including helix lock Increase the attenuation rating of the filter

4.  The effectiveness of a hearing protection device depends on the amount of attenuation it provides and Whether it is made from acrylic, vinyl, or silicone The proportion of exposure time it is used Whether it is full-shell or canal-only How expensive it is

5.  According to Portnuff et al. (2011), 50% of teenagers in their study chose listening levels over 85 dBA in high ambient background noise. When those teens were given isolating earphones to listen to music on their MP3 player, what percent continued to listen above 85 dBA? 50% - no change! 0% - none of them continued to listen too loud 25% - half of those listening too loud with non-isolating headphones listened at safer levels with isolating earphones 40% - there were a few who reduced listening levels

6.  According to Tufts et al. (2012), custom hearing protection devices provided more consistent attenuation than non-custom hearing protection devices for which frequencies? 250 Hz only 1000 Hz and 4000 Hz 4000 – 8000 Hz 500 Hz, 1000 Hz, and 2000 Hz

7.  According to Tufts et al. (2013), what length of ear canal was necessary to achieve maximum attenuation for custom hearing protection devices? It depended on the subject, but generally needed to extend to the 2nd bend 6 mm medial to the aperture of the ear canal in all subjects 14 mm medial to the aperture of the ear canal in half of subjects, 8 mm medial to the aperture in the other half Canal length did not matter as long as there was a tight seal at the aperture

8.  According to the individual chosen listening level regression analysis reported by Fligor and Ives (2006), what ambient noise level in the listening environment accounts for what percent of listeners’ chosen listening level? 17% 100% 37% 50%

9.  Which noise-exposed population has the highest adoption rate of use of custom ear-level devices? Professional musicians Construction workers Workers in all economic sectors Live concert attendees

10.  What is a benefit of using a custom eartip on a tinnitus masker/hearing aid combination device over a non-custom dome? Less ambient sound masking the tinnitus Higher masking noise output from the device with less battery drain The custom-fit eartip can double as a hearing protection device The custom eartip is cheaper and faster to fit than a non-custom dome