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