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Screening Among Workers in a Dockyard in the City of Varna

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Hearing reduction and hearing loss are common among the industrial workers exposed to continuous and intensive occupational noise, although they are completely preventable... Hearing protection devices are more and more widely used in modern industry, however, they are not efficient enough... Binaurial hearing impairment caused by simultaneous exposure to occupational noise and cigarette smoke is proved, too (Mohammadi, et al., )... Workers’ distribution according to the individual length of service in a noisy environment in 2002 and in 2009 is demonstrated on Figure 1... There are insignificant changes of this specific staff’s characteristics during the period of observation... At 61-70 dB, the number of workers examined at 500 Hz is significantly smaller than those at 2000 Hz and 4000 Hz (p<0,001) while at 51-60 dB, the numbers of workers examined at 500 Hz and at 1000 Hz are significantly smaller than that at 2000 Hz (P<0.001)... In 2009, at 21-50 dB, the number of workers examined at 500 Hz is significantly smaller than that at 4000 Hz (P<0.001)... During this 7-year period, despite the implementation of the preventive measures, the number of the patients with acoustic nerve neuritis gradually increased... On the other hand, neither CT, nor MRI revealed any middle and inner ear pathological alterations at all... It is noteworthy that despite the regular usage of noise-protective means a hearing reduction by 25-30 dB was established in 15% of the workers already examined in 2002... Our results are, to a certain extent, in agreement with the data reported by other authors... Some significant effects of age on the noise-induced permanent threshold shifts in workers with bilateral sensorineural hearing loss are established (Krishnamurti, )... There is a statistically significant association between hearing loss level and degree of discomfort introduced by tinnitus among the workers exposed to occupational noise (Dias, et al., )... The audiometric characteristics of the noise-induced hearing loss should obligatorily include hearing threshold shift at high frequencies, with a typical notch at 4000-6000 Hz (Sliwinska-Kowalska, et al., ).

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Age distribution of workers with low-frequency tinnitus in 2002 and in 2009.
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fig005: Age distribution of workers with low-frequency tinnitus in 2002 and in 2009.


Screening Among Workers in a Dockyard in the City of Varna
Age distribution of workers with low-frequency tinnitus in 2002 and in 2009.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4627159&req=5

fig005: Age distribution of workers with low-frequency tinnitus in 2002 and in 2009.

View Article: PubMed Central

AUTOMATICALLY GENERATED EXCERPT
Please rate it.

Hearing reduction and hearing loss are common among the industrial workers exposed to continuous and intensive occupational noise, although they are completely preventable... Hearing protection devices are more and more widely used in modern industry, however, they are not efficient enough... Binaurial hearing impairment caused by simultaneous exposure to occupational noise and cigarette smoke is proved, too (Mohammadi, et al., )... Workers’ distribution according to the individual length of service in a noisy environment in 2002 and in 2009 is demonstrated on Figure 1... There are insignificant changes of this specific staff’s characteristics during the period of observation... At 61-70 dB, the number of workers examined at 500 Hz is significantly smaller than those at 2000 Hz and 4000 Hz (p<0,001) while at 51-60 dB, the numbers of workers examined at 500 Hz and at 1000 Hz are significantly smaller than that at 2000 Hz (P<0.001)... In 2009, at 21-50 dB, the number of workers examined at 500 Hz is significantly smaller than that at 4000 Hz (P<0.001)... During this 7-year period, despite the implementation of the preventive measures, the number of the patients with acoustic nerve neuritis gradually increased... On the other hand, neither CT, nor MRI revealed any middle and inner ear pathological alterations at all... It is noteworthy that despite the regular usage of noise-protective means a hearing reduction by 25-30 dB was established in 15% of the workers already examined in 2002... Our results are, to a certain extent, in agreement with the data reported by other authors... Some significant effects of age on the noise-induced permanent threshold shifts in workers with bilateral sensorineural hearing loss are established (Krishnamurti, )... There is a statistically significant association between hearing loss level and degree of discomfort introduced by tinnitus among the workers exposed to occupational noise (Dias, et al., )... The audiometric characteristics of the noise-induced hearing loss should obligatorily include hearing threshold shift at high frequencies, with a typical notch at 4000-6000 Hz (Sliwinska-Kowalska, et al., ).

No MeSH data available.