CA HA DISPENSING WRITTEN EXAM REVIEW QUESTIONS AND ANSWERS VERIFIED 100% CORRECT

CA HA DISPENSING WRITTEN EXAM REVIEW QUESTIONS AND ANSWERS VERIFIED 100% CORRECT methods to perform a listening check of audiometric equipment - ANSWER -An acoustic calibration check involves using a sound level meter to measure the test signals produced by the audiometer and verifying that these signals meet standard specifications. A bioacoustic check involves using a bioacoustic simulator to monitor the output of the audiometric headphones in order to verify that the output remains stable over time. A functional check involves listening to the output through the headphones to ensure that the signals are being routed properly and that there are no extraneous sounds. acoustic calibration check - ANSWER -using a sound level meter to measure the test signals produced by the audiometer and verifying that these signals meet standard specifications verifying output (which involves measuring each test frequency at one intensity level) and verifying linearity (which involves measuring multiple intensity levels at one frequency). To check the output, the audiometer is set to produce a 70 dB tone at each frequency, and the sound level meter is used to make sure the output is actually 70 dB. To check the linearity, the hearing level dial is adjusted in 10 dB steps, and the sound level meter is used to verify that the output actually changes by 10 dB. The right and left earphones of both the standard and insert headphones must be checked individually. This must be accomplished at the beginning and end of each stand. bioacoustic check - ANSWER -using a bioacoustic simulator to monitor the output of the audiometric headphones in order to verify that the output remains stable over time functional check - ANSWER -listening to the output through the headphones to ensure that the signals are being routed properly and that there are no extraneous sounds. verifying output - ANSWER -measuring each test frequency at one intensity level 70 dB verifying linearity - ANSWER -measuring multiple intensity levels at one frequency 10 dB steps logical order of assessment procedures - ANSWER -otoscopy an objective evaluation of middle ear function - ANSWER -Acoustic immittance a cursory physical examination of the outer ear - ANSWER -otoscopy a basic evaluation of hearing sensitivity - ANSWER -Pure tone air conduction audiometry case history - ANSWER -self-reported hearing ability; use of hearing aids and hearing protective devices relevant medical history occupational and recreational exposures Uncomfortable Loudness Level (UCL) - ANSWER -the hearing level at which a stimuli becomes uncomfortable for the listener. Measure UCL - ANSWER -You will hear the recording of the voice again with the sentences. This time the volume of the voice will get louder and louder. When the volume gets to the point that it is uncomfortably loud or a level that you would not want to listen to for a long period of time raise your hand (or say stop). Do you have any questions? LDL - ANSWER -loudness discomfort level to determine the patient's dynamic range of hearing, which is the range of intensities from the softest sound the patient can hear to the loudest sound they can tolerate - ANSWER -loudness discomfort level asymmetrical hearing loss - ANSWER -a difference between ears of greater than 15 dB or a difference in speech understanding scores of 20% or greater SRT - ANSWER -The ability to distinguish meaningful differences between speech sounds. Use phonetically balanced word list of 25 words minimum, present words at MCL with unemotional live voice, score 4% for each correct word. Ex. Say the word *** Shorter Canal Length gives you ? - ANSWER -Less Lows Longer Canal Lenghts give you? - ANSWER -More Lows Smaller bore diameter gives you? - ANSWER -Less Highs Larger bore diameter give you? - ANSWER -Less Lows What is the standard tube size? - ANSWER -13 What is the standard Canal Length for H.A. - ANSWER -0.710" Contra-lateral Vent - ANSWER -Intersects transmission to control feedback. Used with BTE Sampling rate - ANSWER -has a direct bearing on Frequency. Example: sampling rate of 16kHz has sinewave of 16,0000. Size of ear canal - ANSWER -1 inch to 1 3/8 inch long.. .7 cm or 1/4 inch diameter (like tip of a lead pencil) Size of ear drum - ANSWER -9mm (1/4 inch high 3/8 inch wide size of hole made by paper punch) Alaising - ANSWER -an effect that causes different signals to become indistinguishable (or aliases of one another) when sampled. Central Deafness - ANSWER -hearing loss or impairment resulting from defects in the central nervous system (as in the auditory cortex) rather than in the ear itself or the auditory nerve—compare conduction deafness, nerve deafness. Damage or disorder within brain stem, tumor or abscess