CAOHC Exam Questions with All Correct Answers

CAOHC Exam Questions with All Correct Answers What is the mission of CAOHC? - Answer--promote best practices in hearing conservation worldwide and promote HL prevention thru training, guidance and support What are the professional disciplines represented on CAOHC? - Answer-OHC's, CD's, PS's Who are the people that work w OHC? - Answer--occupational health nurse, audiologist, noise control engineer, physician, safety and health specialist, company management What are the elements of an effective hearing conservation program? - Answer--noise monitoring, noise control, employee training, audiometric testing, hearing protection and recordkeeping What does the outer ear do? - Answer-collects/ funnels sound What does the middle ear do? - Answer-Convert sound waves to mechanical energy What does the outer ear do? - Answer-Converts mechanical energy to electrical energy What are 2 causes of conductive HL? - Answer--otosclerosis (stapes cannot move), eustachian tube dysfunction What are three causes of sensorineural HL? - Answer--presbycusis, noise exposure, chemicals What frequencies are affected by noise exposure? - Answer-High Whats the configuration of NIHL? - Answer-noise notch at 4K What does the eustachian tube do? - Answer-Equalizes pressure in the middle ear Hz is - Answer-frequency / pitch dB is - Answer-amplitude/ loudness/ intensity why is noise measured w an A weighted filter at work - Answer-it imitates how the human ear responds to sound What is TWA? - Answer-time weighted average- the noise exposure averaged over an 8 hr period what is the OSHA 5 dB exchange rate? - Answer-every 5 dB increase you can b around the sound for half the time (85 dB for 8 hrs, 90 dB for 4) What are the federal regulators w a hearing conservation policy? - Answer-MSHA- mine safety and health administration FRA- federal railroad administration DoD- department of defense OSHA- occupational safety and health administration *NIOSH - DOESNT REGULATE how to state regulations differ from federal? - Answer--more strict bc has to b approved and monitored by OSHA What are the 6 elements of the OSHA hearing conservation regulation? - Answer--noise control, noise monitoring, audiometric testing, hearing protection, employee training, recordkeeping Types of audiometers, pros and cons - Answer--manual- human error can occur but personalized to patient -microprocessor/automatic- eliminates human error but not focused on individual Parts of audiometer - Answer--selection for frequency -dial for dB -interrupter switch to present tone -continuous or interrupted tone option switch -selection for R/L ear -earphones Types of calibration - Answer--daily -functional and biological -acoustic- annually unless daily functional deviates 10 dB -exhaustive- every 2 years unless acoustic deviates 15 dB Process for finding audiometric threshold - Answer-start at 1000 w 30 dB if no hear go up to 50 if still not go up to 60 , if hear do the down 10 up 5 till find 2/3 ascending yeses then go to 500 then 1000.... Whats an STS? - Answer-average change of 10 dB or more in 2K, 3K, 4K Hz compared to baseline (30 dB together) Follow up procedure after STS - Answer--notify employee in writing within 21 days -can retest within 30 days - if no STS and exposed to less than 90 dBA TWA then can discontinue use of HPD -must b fitted, trained and use HPD 5 problem audiograms that require professional supervisor - Answer--STS -Recordable STS -Reporting pain, dizziness. -Asymmetric HL -inconsistencies What is the action level? - Answer-at 85 dBA or above employee must b included in protection program, must wear HPD if at 90 dB or above What is PEL? - Answer-permissible exposure limit- 90 dbA- employer must have feasible noise controls to try to reduce noise level What instruments are used to measure noise in the workplace? - Answer-Dosimeter- on the individual and shows their specific noise levels Sound level meter- measures a specific area or equipment in workplace What is NRR? - Answer-Noise reduction rating- it overestimates the amount of protection in the real world