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Author: admin | 26.01.2016 | Category: Ginkgo Biloba Tinnitus

Background: The textile workers exposed to industrial noise are prone to develop hearing loss concentrated mainly at high audible frequencies. Occupational noise induced hearing loss: Is planning appropriate type of shift work for the workers the most practical potential preventive measure? This website utilizes javascript to enhance your experience, please enable javascript to access all of the features of this website.
Are the consequences of neonatal hearing loss serious enough that we need to be concerned about them in the first place?
Slide #47 shows data from an annual survey done each year by Gallaudet University showing that children with severe profound bilateral losses suffer from substantial deficits in reading comprehension. Although virtually everyone agrees that severe profound bilateral hearing loss has substantial negative consequences for all aspects of academic performance, the consequences of mild bilateral or unilateral hearing loss are less well known. The data in slide #50 come from the Greater Boston Otitis Media Study Group, where 194 children were followed prospectively for 7 years. Noise Induced Hearing Loss (NIHL) is the second most leading cause of hearing loss after age-related hearing loss. Living with a male with noise induced hearing loss; Experiences from the perspective of spouses.
Attitudes towards co-workers affected by occupational hearing loss I: Questionnaire development and inquiry. Attitudes towards co-workers affected by occupational hearing loss II: Focus group interviews. Study of noise environment and audiometric survey of technical airmen at various fighter bases in IAF. Prevelance and an analysis of noise induced hearing loss in army helicopter pilots and air craft mechanics.
Finding of standard and high frequency audiometry in the workers exposed to occupational noise of long duration. Hearing in military pilots: One time audiometry in pilots of fighters, transports and helicopters. Functinal and histological changes in the cochlea of guinea pig resulting from prolonged stimulation. Look no further, we are the only online source you need for hearing related products and and accessories.
Fortunately, there is a wealth of data on this question, and only three very brief examples will be given related to children with severe profound bilateral losses, children with mild bilateral and unilateral losses, and children with fluctuating conductive losses (slide #46). There are, however, a number of studies demonstrating that even mild or unilateral sensorineural hearing loss has substantial negative consequences. Although virtually all newborn hearing screening programs focus only on identifying children with permanent congenital hearing loss, some children with fluctuating conductive losses are often identified.


Each time the child visited his or her primary- care physician, data were collected about episodes of otitis media (there were an average of 7 visits per year during the birth to 3-year-old period). Various studies have shown that people exposed to noise level above 85 dB suffered from NIHL.
That gap continues to widen over time, with the average deaf child or youth never exceeding a grade equivalent of 3 years, in spite of the fact that most of them are enrolled in educational programs specifically designed for deaf students. Slide #48 summarizes information about five different students in which a sample of children with unilateral hearing loss were compared to similar children with normal hearing, and measures were taken about their performance in math, language, and social functioning.
The reason for presenting this information is to emphasize the point that even mild fluctuating hearing losses have an important negative effect on developmental outcomes. Data were also collected periodically on a wide variety of measures related to intellectual ability, cognitive functioning, and language competency by trained diagnosticians who were uninformed about the purposes of the study. Materials and Methods: A cross-sectional study was carried out on 50 weavers of plastic industries exposed to high levels of constant noise. As shown in slide #49, children with unilateral hearing loss lagged substantially behind their peers regardless of the measure used, whether math, language, or social functioning. Results at 7 years of age for two groups of children are reported here: those with less than 30 days of otitis media over the 3-year period compared to those with 130 or more days of otitis media over the same period.
Even though the sample sizes are quite small in each of the studies, matching was generally done quite well and the results are very consistent. After statistically adjusting the results for a variety of demographic and socio-economic status variables, children with fewer episodes of otitis media did substantially better than their peers on all measures.
Subjectively, pure tone audiometry was carried out to measure hearing thresholds at various frequencies. The difference averaged about one-half standard deviation, which is equivalent to more than a year's worth of development in reading or math achievement. Traditionally loud noise produces an audiometric notch at 4 kHz known as "Aviator's Notch." [8],[9] However few studies showed notch at 6 kHz.
Results: Prevalence of hearing loss symptom and hearing thresholds were more in exposed group than in control group. Audiometry revealed notch at 4 kHz with less effect at 6 or 8 kHz, cumulative effect of duration of exposure. They work for 8-12 hours a day for 6 days a week continuously without the use of any hearing protective devices. Conclusion: Textile weavers are more at risk to develop Occupational Noise Induced Hearing Loss (ONIHL) mainly affecting higher frequencies concentrated at 4 kHz. The present study tried to evaluate the prevalence of audiometric notch at higher frequencies of 4000 Hz, 6000 Hz, and 8000 Hz, and to look for its significance by comparison with matched controls. It also tried to find the frequency that affected the most by impact type of noise of weaving industry.


We also tested the changing pattern of hearing with regard to increase in duration of exposure.
Out of 64 subjects screened initially by personal history, past history, family history, occupational history and medical history, 14 were excluded due to presence of some other cause of hearing loss apart from noise. Total 50 workers (33 males and 17 females) with at least 5 years of exposure to noise without any interruption in job were recruited randomly from 5 different plastic weaving textile factories. For comparison, 50 age- and sex-matched controls not exposed to any kind of noise were evaluated.Assessment of hearing Subjective hearing assessment was carried out by pre-designed, validated, structured questionnaires related to presence or absence and type of hearing loss. The problem was quantified by pure tone audiometry using ALPS manual audiometer done in a silent room away from the workplace at weekends in order to avoid temporary threshold shift by allowing a minimum of 16 hours rest after last exposure to noise.
Pure tones were presented by air conduction at various frequencies to test the hearing threshold of both ears with sensitivity of 2.5 dB. Statistical significance of the results was analyzed using Chi-square test, Z test and t test. When hearing loss is limited to the high frequencies, individuals are unlikely to have difficulty in quiet conversational situations. The first difficulty patients usually notice is trouble understanding speech when a high level of ambient background noise is present. Symptoms like trouble in normal and telephonic conversation, turning up TV and radio volume, and tinnitus are early to occur. Hence its presence or absence is not much significant.A study done [26] in 1992 evaluated the development of ONIHL under the influence of pulse noise. Workers engaged with weaving and blacksmithing were the 2 study groups, both being exposed to noise level of 109 dB.
The result showed a reliable difference between the study groups both in the quality of cochlear neuritis and the grade of hearing loss. Mild hearing failure dominated in the weavers' group whereas moderate and severe form appeared in blacksmiths. Due to the constant noise of power loom machines comparatively less damage occurs and as a result hearing loss was mild to moderate in the present study. Boettcher [27] has shown that when impact noise is superimposed on continuous noise, the injurious potential is synergistically enhanced. A transmission electron microscopic study showed that there is edema and swelling of afferent nerve endings below the inner hair cells on exposure to noise. Use of hearing protective devices can bring the noise exposure below the upper permissible limit and the disease can be prevented theoretically if not practically.




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Comments to “Mild hearing loss in 3 year old jobs”

  1. That volume even about three/4 inch library for a full year. Dalhousie University in Nova Scotia.
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