This paper analyzes current status of occupational noise hazard and its control in China,and holds that the way of controlling occupational noise hazard in China is to make and implement effective hearing conservation program.
In order to control industrial noise in China more effectively,the authors suggest that,in addition to further strenthening the study of noise control technique,it is vital to work out and implement effective hearing conservation program.
It showed that when the pressure wave was under the allowable level of the standard there still was an evident hearing lesion to those workers. The actual hearing protection rate reached only 32.95%, far below the guaranty of the standard which originally assures>90% unprotected on-the-spot persons of safe, according to this result the standard was considered to be inapplicable in occupational shooting ranges of the ordnance system.
The engine hatchway noise level of the main types of fighter aircraft in our country ranged from 117 to 130 dB(A), while the maximum engine hatchway noise of J-8D exceeded 140 dB(A). This is far beyond stipulate criteria for protection of hearing home and aboard, that is the noise should not exceed 115 dB(A) for naked ear noise exposure.
This method is proposed in an attempt to upgrade industrial audiometric programs from hearing impairment detection programs to real hearing conservation programs.
Hearing thresholds in an auto assembly plant: prospects for hearing conservation in an Nigerian factory
The results indicate good prospects for hearing conservation for Nigeria workers if hearing protection and noise abatement programs, currently not mandated by statutes, can be instituted.
An effective hearing conservation program, including a periodic audiometric testing and hearing protection intervention, for this study population should be in place.
It is concluded that noise, at "safe" levels for human hearing conservation, when not associated with other potentially noxious stimuli does not cause hyperactivity of the pituitary-adrenocortical system.
Both microsurgical resection and Stereotactic radiosurgery (SRS) have been associated with poorer rates of hearing preservation in patients with NF2 than in sporadic VS.
In an attempt to maximize hearing preservation while maintaining good tumor control, we have conducted a prospective trial of three fraction SRS for the treatment of VS in patients with NF2.
Actuarial rate of hearing preservation at 2 years was 67%.
Continued follow-up will be necessary to evaluate long-term tumor control and hearing preservation.
The prediction on whether the tumor originated in the superior or inferior aspect of the IAC was superior to caloric test, which might have clinical significance in treatment planning especially for hearing preservation surgery.