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Bone Conduction Audiometry - The Good, The Bad, and The Interesting

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1.  Which of the following influences the measurement of bone conduction thresholds due to the influence of the air conduction pathway? Distortion of the skull Inertia Placement of the bone conduction transducer Compression

2.  The mode of bone conduction stimulation that causes vibration of the walls of the external auditory canal is the Osseotympanic mode Compression mode Inertial mode Transtympanic mode

3.  The ANSI Standard for Audiometers (ANSI S3.6) requires how much application force of the bone conduction oscillator when properly placed? 40 grams 200 grams 400 grams None of the above

4.  Bone conduction thresholds will be _____ if the bone conduction oscillator surface area is larger. Inconsistent Worse Lower (better hearing) Unchanged

5.  Which of the following may contribute to inaccurate air conduction threshold measurements? Improper placement of supra-aural headphones Insertion depth of foam tips when using insert earphones The condition of supra-aural earphone cushions All of the above

6.  Which of the following may contribute to an air/bone gap at 4KHz? Collapsing ear canals Aging Inaccurate bone oscillator placement All of the above

7.  Air-borne acoustic radiation of the bone oscillator has been suggested as a possible factor for an unexplained air/bone gap at 4KHz. Which of the following method can be used to rule out this as a factor? Occlude the test ear with a foam tip and re-test the bone conduction threshold at 4KHz Do not use contralateral masking Re-position the bone conduction oscillator Adjust the tension of the headband

8.  One of the best ways to monitor possible changes in the output of an audiometer’s different transducers is to Perform a listening check on each transducer every day Measure the output of all transducers daily with a sound level meter Perform periodic biological calibrations Adjust bone conduction thresholds to agree with immittance testing

9.  What is the audiometric advantage of using the new Radioear B81 bone conduction oscillator It has a larger surface area thereby improving test/retest reliability It has a higher maximum output of approximately 10-25dB through 1KHz with lower distortion It is more durable Both B and C

10.  The advantages of frontal (forehead) placement of the bone conduction oscillator compared to mastoid placement are The forehead offers a larger surface area thereby improving test-retest reliability The air conduction transducers (inserts or circumaural) can be kept in place bilaterally during bone conduction testing There is little or no occlusion effect All of the above