Bone conduction audiometry Bone conduction audiometry Aim: To determine the type of hearing Aim: To determine the type of hearing loss by testing the sensorineural loss by testing the sensorineural mechanism. mechanism. Bone conduction actually works through Bone conduction actually works through three mechanisms: three mechanisms: Distortion of the skull bones Distortion of the skull bones Activity of the ossicles Activity of the ossicles Movement of the air column in the Movement of the air column in the outer ear canal. outer ear canal.
Bone conduction audiometry. Aim: To determine the type of hearing loss by testing the sensorineural mechanism. Bone conduction actually works through three mechanisms: Distortion of the skull bones Activity of the ossicles Movement of the air column in the outer ear canal. - PowerPoint PPT Presentation
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Bone conduction audiometryBone conduction audiometry
Aim: To determine the type of hearing loss Aim: To determine the type of hearing loss by testing the sensorineural mechanism.by testing the sensorineural mechanism.
Bone conduction actually works through Bone conduction actually works through three mechanisms: three mechanisms:
Distortion of the skull bonesDistortion of the skull bonesActivity of the ossiclesActivity of the ossiclesMovement of the air column in the outer Movement of the air column in the outer
ear canal.ear canal.
Issues with bone conductionIssues with bone conduction
Placement: Mastoid or forehead?Placement: Mastoid or forehead?
Which ear is being tested?Which ear is being tested?
Procedure for testing similar to ACProcedure for testing similar to AC
Record thresholds in audiogram using appropriate Record thresholds in audiogram using appropriate symbols.symbols.
Audiogram interpretationAudiogram interpretation
Based on AC and BC thresholds and relationship between Based on AC and BC thresholds and relationship between them.them.
Difference between AC and BC: Air-Bone Gap (ABG). Shows Difference between AC and BC: Air-Bone Gap (ABG). Shows amount of conductive componentamount of conductive component
If both AC and BC within normal limits: Normal hearingIf both AC and BC within normal limits: Normal hearing
If AC thresholds elevated, BC normal: ?If AC thresholds elevated, BC normal: ?
If both AC and BC elevated, but ABG less (≤10 dB): ?If both AC and BC elevated, but ABG less (≤10 dB): ?
If both AC and BC elevated, but ABG high (>10 dB): ?If both AC and BC elevated, but ABG high (>10 dB): ?
Cross-hearingCross-hearing
Response by the non-test ear.Response by the non-test ear.