Not Masked Air and Bone Conduction (BSA Procedure)
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| What level should ambient noise not exceed? | 35dB
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| What should communication strategy take into account? | - Age - Hearing level - Language Skills - Attention/Concentration - Other communication difficulties
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| Audiometry is preceded by... | Otoscopy
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| Insert earphones are used where... | ...there is a possibility of ear canal collapse with supra-aural headphones
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| History taking (audiological) | Noise exposure in the last 24 hours -
Tinnitus - Recent ear infections / Pain in ears - Surgery to ears at any stage - Which ear is more acute
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| What two important points should be covered at the start of the consultation? | - Verifying patient - Introducing the appointment
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| What is considered loud noise exposure? | Noise in which you need to shout at a distance of 1 meter
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| How long should the test take? | The test should not exceed 20 minutes
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| Dealing with tinnitus | -Subjects asked to ignore tinnitus as much as possible - Inform the tester if experience difficulty (note made)
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| Instructing the patient | - Testing the quietest sounds you can hear -As soon as hear sound, press button - Release when no longer heard.
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| Press button irrespective of... | - Ear it is hear in - How quiet it is
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| Other important instruction points | - Sit still and quietly - Interrupt is uncomfortable or if the need a break
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| Where should insert earphones not be used? | - Excessive wax - Infection - Obstructions - Abnormalities
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| PTA should test the ......... ear first | Most acute (better)
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| Test order | 1000, 2000, 4000, 8000, 500, 250,Retest 1000 if first ear.
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| If the retest value is less than 5dB different then... | The most sensitive value is taken
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| If the retest value is more than 10dB different then... | Reason should be investigated (reinstruction and repeat)
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| Duration of test tone | Varied between 1 - 3 seconds
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| Interval between test tones | Varied between 1 - 3 seconds
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| Initial familiarisation level | 1000Hz at 40dB HL or 30dB above previous audiogram. If no response increase in 20dB steps until response (5dB steps above 80dB).
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| Example of audiometry: Satisfactory familiarisation | Decrease in 10 dB until response
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| No response | Increase in 5dB until response
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| Response | Decrease by 10dB
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| No response | Increase in 5db until response at consistent level >50% of presentations
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| Which is better: 3 accurate frequencies or 6 non accurate frequencies? | 3 accurate frequencies
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| I am ommitting frequencies or modifying the test | I must note on the audiogram/journal
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| The bone conductor is placed on the... | WORST hearing ear (noted on audiogram or journal)
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| Points on position of bone conductor | As close to the pinna without touching it and with no hair obstruction
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| Test order | 1000, 2000, 4000, 500
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| Instructions | Same as A/C but with emphasis on irrespective of side
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| At ......Hz the signal presented by the bone conductor may conduct by air conduction, what should be done? | 4000Hz and a plug should be placed in NTE
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| What is the other major source of error in bone conduction? | Vibrotactile threshold
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| Normal | -10 to 20dB HL
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| Mild | 20 to 40dB HL
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| Moderate | 40 to 70dB HL
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| Severe | 70 to 90dB HL
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| Profound | Above 90dB HL
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