in noise prevention and care, can make noise in factories, engineering controls, at the individual level, you can use earplugs, earmuffs and other protective equipment, as far as possible away from the noise source, avoid using headphones, intermittent exposure and adequate rest , if the ear is not convenient to wear personal protective equipment, it is recommended first removed from the work area noise, etc. cure can then resume wearing protective equipment, in addition, if the pre-employment medical examination hearing abnormalities have been found, as will workspace or broadcast audio alert is easy to overlook, is not recommended either for noise workspace. The choice of hearing protection should note that the above marked NRR (Noise Reduction Rating), vendors must first be marked as part of a laboratory test values adjusted, is actually able to be applied to the workplace, you can reduce the noise decibel .
Therefore, our labor health protection rules in Article II: Exposure to eighty-five db or more workers operating under noisy environment,mbt baratos, we must implement a special health check and give hearing protection. The decree Noise Operating Environment Labour special physical and health checks includes: Operating experience of the investigation, ear investigation related to past experience, ear partial examination, and complete hearing tests (Audiometry), and the exclusion of other congenital or hereditary ear possibilities.
Finally, the comprehensive proposal workplace hearing protection, proceed from the following directions: Noise source control or engineering improvements, staff training and awareness to enhance the effective of the personal protective equipment provided or on-site configuration, efficiency in the use of personal protective equipment audits, exposure time control, work with hearing-impaired employees and return to work, regular health checks and tracking, back to the clinic, data preservation and archiving.
while determining occupational hearing loss caused by noise must follow these five plateau is: 1. diseased evidence: to have evidence of hearing loss; 2. exposed Evidence: evidence of noise exposure have 3 Timing resistance: have sufficient induction period (5-10 years); 4 Consistency: To comply with noise-induced hearing loss typical characteristics; 5. exclusion of other causative factors: to be able to exclude auditory aging, otitis media, ototoxic drug use , congenital or hereditary hearing impairment, and other factors. Therefore must be carried out by the otolaryngologist differential diagnosis of hearing impairment, coupled with exposure to industrial safety and health division for the analysis of the evidence, and finally by the occupational physician Taking these conditions can not make a determination whether it is career-related.
hearing loss caused by noise is characterized by a chronic, gradually accumulate, permanent, irreversible, and is bilaterally symmetrical sensorineural hearing loss, damage due to high-frequency hearing early, hence the early damage is not easy perceived to be detected by regularly listening to early detection, usually caused by pure tone audiometry graphics features as you can see 3k, 4k, 6k Hz concave valley type (dip) audiogram.
noise-induced hearing loss is mainly caused by inner hair cells in the cochlea mechanical injury or metabolic depletion, epidemiological survey found that exposure to loud noise environment, operating labor, of which approximately 22% have hearing loss, the importance of labor The health hazard factor, third-order noise problems. The aging population and the loss of hearing ability ham, the prevalence of chronic diseases in all third-ranked. Hearing loss caused by noise is a common clinical, but difficult to detect but preventable disease.
humans do not want to hear is called noise, can be divided into categories according to characteristics of stability, variability, intermittent, impact noise,nike free run, and noise caused by health hazards include: hearing loss, tinnitus, headache, balance barriers and emotional impact,nike free, such as irritability, anxiety, stress, irritability,MBT Sko Danmark, fatigue; or inattention, prone to accidents and other behavioral effects of the problem; cause communication barriers, such as ignore the warning sounds, conversations interference; and produce hypertension , heart disease and other cardiovascular diseases; There are also a few reports that pregnant women can cause miscarriage reproductive harm.
hearing tests commonly used for the pure tone audiometry (PTA: Pure Tone Audiometry), which is a basic and accurate hearing tests, in general, as long as more than 3-5 years of age, can be subject to follow orders, checks must be in a quiet soundproof room for air conduction and bone conduction testing to 125 Hz ~ 8k Hz pure tone to stimulate behavioral hearing threshold is detected, so the examiner must be trained subjects also must be properly only to be checked, so subjects will be learning effect, uncooperative effect, and even fraud deaf (Malingering), but it is still a test hearing Gold standard. On the test frequency, the greater high-frequency 2000Hz, below 500Hz low frequency, clinical classification of hearing loss will be less than 25 dB with normal hearing, 25 ~ 40 dB as mild hearing loss, 40 ~ 55 dB as moderate hearing loss, 55 ~ 70 dB moderate to severe hearing loss, 70 ~ 90 dB severe hearing loss greater than 90 dB for the very severe hearing loss. The general conversation about 500,1000,2000 Hz frequency which three frequencies, it is generally used to represent a person's hearing threshold calculation method is the 500, 1000, 2000 Hz divided by the sum of the number of decibels of hearing three 3 points system to calculate.