CAOHC test

CAOHC test What is the purpose of the OHC? - ANS Providing resources and guidance to facilitate the practice of hearing loss prevention through standardized training and credentialing What is the difference between the requiremtns of OSHA and the recommendations of NIOSH? - ANS NIOSH refers to research and recoomendations. OSHA regulates and implements. What are examples of auditory effects on hearing and damage risks? - ANS Tinnitus and hearing loss What are non auditory effects on hearing and damage risks? - ANS Stress, high blood pressure What are potential sources of hazardous noise in occupational work settings? - ANS Machinery, constructino, railoroads and equipment, mining, manufacturing, farming, professional musician What are potential sources of hazardous noise in non occupational work settings? - ANS Motorcycles, sporting guns, carpentry equipment, lawn equipment, personal listening devices What are some of the lasting effects of noise induced hearing loss? - ANS Social withdrawal, frustration, anger, and effects on private life What are the "do's" of an OHC (hearing tech)? - ANS Education, fitting hearing protection, hearing test, and counciling What are the don'ts of an OHC (hearing tech)? - ANS Diagnose, supervise Who can be Professional Supervisors? - ANS Audiologists and physicians How many workers are exposed to hazardous noise on the job? - ANS 22 million plus What occupational population is most at risk for noise induced hearing loss which highest amount of claims? - ANS Manufacturing accounts for approximately 14% of U.S workforce but accounts for approximately 80% of incidence of NIHL. Collects sound waves, localizes sounds waves, protects middle ear components and provides resonate amplication is the function of what part of the ear? - ANS Outer ear Acoustic transformer, impedance matching system, provides pressue equalization, and protects the inner ear is the function of what part of the ear? - ANS Middle ear Provides intensity, frequency and temporal coding that is relayed via the auditory nerve for further processing is the function of what part of the ear? - ANS Inner ear An early stage indication of noise induced hearing loss is identified typically at which frequencies on an audiogram? - ANS 3-6 kHz What is a general rule of conductive hearing loss? - ANS Flat and often worse at low frequencies What would be an indication of an advanced stage noise induced hearing loss? - ANS A notch configuration progressing to a high-frequency slope Mixed hearing loss is a combination of what? - ANS Conductive and sensorineural components What is a symptom of sensorineural hearing loss? - ANS Difficulty discriminating speech or tinnitus What is a symptom of conductive hearing loss? - ANS Fullness, pressure, muffled hearing and clarify when sound is loud enough Peripheral functions are those associated with the? - ANS Cochlea Conductive disorders are typical to which site of lesion, in contrast to NIHL? - ANS Outer and middle ear Serial audiogram configurations typically shows: - ANS Numerical What is the audible frequency range at birth? - ANS 20-20,000 Hz low/high requency Hz is subjectively interpreted as what? - ANS Low and high pitch Frequency is subjectively interpreted as? - ANS Pitch and the number of cycles per second What is the speech range for most communication? - ANS 250- 4,000 Hz Low/high intesity (dB) is subjectively interpreted as? - ANS Low/ High loudness (intensity corresponds to loudness) The Action level is at what dB? (requires HCO implementation i.e. hearing testin, program inclusion, hpd) - ANS 85 dB Permissible exposure level is at what dB? - ANS 90 DB What is the concept of steady state noise? - ANS Long duration (.5) i.e engine noise What is the concept of intermittent noise? - ANS Noise that comes and goes and is sometimes cyclical (i.e vehichle warning backup noise or hydraulic lift) What is an example of an impact noise? - ANS Hammer to nail What is an example of an impulse noise? - ANS Gunshot dB (A) is used for? - ANS OSHA, MSHA, FRA, DoD compliance in hearing conservation. 0 dB HL does not mean what? - ANS It does not mean that there is no sound at that level What HL (hearing level) scale is constructed to represent the average softest sound a young adult can hear at each test frequency. - ANS 0 dB HL 0-25dB HL represents what? - ANS Normal hearing range 90 dB HL represents what? - ANS Typically the highest output level on a pure tone air conduction screening audiometer What serves as the basis for all other U.S hearing conservation regulations and thus is the basis for the OHC course instruction. - ANS OSHA Amendment (29 CFR 1910.95) What are indications for manual audiometry? - ANS Slow/inappropriate responses, no response, unilateral hearing loss, and functional hearing loss. What is the pace at which pure tones should be presented? - ANS between 1-2 seconds State and local requirements must what? - ANS Meet or exceed federally mandated HC requirements. (be equal or more strict) Background noise can affect what? - ANS Low frequencies 500 Hz and below. What is an indication for a special testing situation? - ANS Claustrophobia Acoustic calibrations must be done? - ANS Yearly Functionaly and biological checks are part of what? - ANS Daily calibration What is an advantage of using a microprocessor versus a manual audiometer? - ANS The ability to test multiple people at one time What is the quiet peroid baseline before testing? - ANS 14 hrs When trouble shooting an audiometric booth, or isolating noise sources who or whom should one turn to? - ANS Acoustical engineer The highest amount of noise suuposedly an employee may be exposed to without incurring the risk of adverse health effects is known as the? - ANS Time weighted average (TWA) What should one wear double hpd? - ANS 104-108dB A laboratory value assigned to the individual porduct and not a reflection of what kind of attenuation the worker will ultimately recieve is called? - ANS NRR What are the OSHA regulations for exchange rates associated with TWAs? - ANS 5 dB What are the NIOSH recommendations for exchange rates associated with with TWAs? - ANS 3 dB Confirmation of an STS must take place within? - ANS 21 days