1 / 6

Bone conduction audiometry

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.

sereno
Download Presentation

Bone conduction audiometry

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. 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.

  2. Issues with bone conduction • Placement: Mastoid or forehead? • Which ear is being tested? • Occlusion effect (Table 4.2, page 89) • Tactile responses • Procedure for testing similar to AC • Record thresholds in audiogram using appropriate symbols.

  3. Audiogram interpretation • Based on AC and BC thresholds and relationship between them. • Difference between AC and BC: Air-Bone Gap (ABG). Shows amount of conductive component • If both AC and BC within normal limits: Normal hearing • 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 high (>10 dB): ?

  4. Cross-hearing • Response by the non-test ear. • Inter-aural attenuation (IA; Table 4.3, page 96/105) • Cross-hearing for AC occurs when ACTE – IA ≥ BCNTE

More Related