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The Audiogram PowerPoint Presentation

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Description : Check out this medical presentation on Noise-Induced Hearing Loss, which is titled "The Audiogram", to know about measurement of hearing and audiogram interpretation.

Tags : Noise-Induced Hearing Loss, Audiogram, measurement of hearing, audiogram interpretation

Published on : Jul 10, 2021 | Views : 1702 | Downloads : 3

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Slide 1-

1 The Audiogram Measurement of Hearing and Audiogram Interpretation
Slide 2-

2 Introduction How we measure hearing How those measurements can be recorded What the audiogram can tell us
Slide 3-

3 Purposes of audiometric testing Monitor the effectiveness of the hearing conservation program Identify significant threshold shift Establish readiness and fitness for duty Ensure proper referral and diagnosis
Slide 4-

4 Vocabulary Audiogram - A record of a person’s pure-tone hearing threshold levels Threshold – A level of sound that a person can detect 50% of the time or more Audiometric Zero – sensitivity of normal, young adults
Slide 5-

5 Audiometric Zero (Ref ANSI S3.6 1996, TDH-39 earphones) 0 dB Hearing Level at 1000 Hz = 7 dB SPL
Slide 6-

6 Does 0 dB HL mean the absence of sound? What is the intensity of a 0 dB HL pure-tone at 1000 Hz?
Slide 7-

7 Output Limits of the DOEHRS-HC Audiometer -10 to 100 dB HL
Slide 8-

8 Serial Audiogram Thresholds recorded to the nearest 5 dB Used on DD Forms 2215 and 2216, entrance physicals and physical exam forms (SF 88 and DD 2808)
Slide 9-

9 Serial Audiogram
Slide 10-

10 Graphic Audiograms Provides a pictorial representation of hearing thresholds as a function of frequency and intensity Uses symbols and/or colors to represent right ear, left ear, bone conduction hearing and masking levels
Slide 11-

11 Graphic Audiograms
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12 Self-recording Audiogram
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13 Degrees of Hearing Loss Normal Hearing -10 - 25 dB HL Mild Hearing Loss 30 - 45 dB HL Moderate Hearing Loss 50 - 65 dB HL Severe Hearing Loss 70 - 85 dB HL Profound Hearing Loss > 90 dB HL
Slide 14-

14 Audiogram Configurations: Progressive noise-induced hearing loss
Slide 15-

15 Hearing Loss Zones
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16 dB Hz 250 500 1000 2000 3000 4000 6000 8000 sh f th s ch p h k Speech Sounds
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17 Audiogram Configurations: Gundecking
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18 Audiogram Configurations: Background Noise
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19 Cross-over One ear hears much better than the other The sound presented to the test ear crosses through the skull and stimulates the hair cells of the cochlea of the non-test ear The non-test ear is the one actually responding to the tone Differences of > 40 dB at the same frequency between ears are suspicious
Slide 20-

20 Cross-over
Slide 21-

21 Malingering Pretending to have a hearing loss by waiting until the sound is quite loud before pressing the response button IAW Article 115, Paragraph 194, a person may be charged with malingering if he/she pretends to have a hearing loss that is later found to be non-existent
Slide 22-

22 Automatic Rechecks
Slide 23-

23 Sensorineural Hearing Loss Determined by a complete audiological evaluation Compare air-conduction and bone-conduction pure-tone thresholds Look at acoustic immittance test results
Slide 24-

24 Sensorineural Hearing Loss
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25 Conductive Hearing Loss
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26 Counseling Patients
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27 Explain the Test Results Provide privacy for explanation Both ears tested Frequencies tested The lower the threshold, the better the hearing Review each ear in terms of intensity and frequency
Slide 28-

28 Appropriate Explanations Within normal limits Loss in the high or low frequencies Loss in one or both ears Hearing has changed or remained the same
Slide 29-

29 Making Diagnoses
Slide 30-

30 Medical Legal Requirements Regardless of Type Patient’s name, SSN, (MOS, SSI, Job Location, and Unit Identification Code) Examiner’s name, SSN, and certification number Date of Test Make, model, and serial number of audiometer Calibration date of audiometer.
Slide 31-

31 DOEHRS-HC supplies most of the necessary medical legal audiogram information AUTOMATICALLY
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32 DD Form 2215 Reference Audiogram For all military and noise-exposed civilians Performed before noise-hazardous duties or as soon as possible thereafter Noise-free period of at least 14 hours before the test No temporary ENT problems the day of test Refer for low-frequency or high-frequency hearing loss After a permanent STS, re-establish a new baseline
Slide 33-

33 DD Form 2216 Hearing Conservation Data Periodic audiogram Annual 90 - Day Termination Other
Slide 34-

34 Forms General Information Maintain audiograms for entire period of employment plus 5 years Test must be performed by audiologist, physician, persons certified by CAOHC, or one who has received equivalent military training Equivalent military training includes this course. The certification from this course and other Army courses is only 5 years
Slide 35-

35 Audiogram Review Trained personnel must review all audiograms for validity and proper patient disposition. Who Reviews? Initially any Hearing Conservation Technician Problem audiograms must be reviewed by an audiologist, otolaryngologist or other physician
Slide 36-

36 Audiograms to Refer DD 2215’s > 25 dB at 500, 1000, and 2000 Hz > 55 dB at 3000, 4000, or 6000 Hz DD 2216’s Significant Threshold Shift (STS) computed from the average of 2000, 3000, & 4000 Hz in either ear in comparison to the baseline or reference hearing test (DD2215)
Slide 37-

37 Factors Affecting Validity Poor test environment - audiometric test booth does not meet background noise criteria Cross-over hearing Uncooperative patients
Slide 38-

38 Review Questions Does an audiometric booth need to be perfectly soundproof? Excessive noise in an audiometric test booth will probably effect which frequency? When hearing levels between ears at the same frequency differ by 50 to 70 dB, what should you suspect is going on?
Slide 39-

Image references Swedish Soldier by ~0Nutter0. CC-BY-NC-ND http://0nutter0.deviantart.com/art/Swedish-Soldier-78653654 Barbed wire by ~Maximum-Mod. CC-BY-SA-3.0 http://maximum-mod.deviantart.com/art/Barbed-wire-164366771 Black Icon Scissors Symbol Silhouette White by Nemo (Pixabay user) Doctor Consults with Patient image by Bill Branson (Photographer) released into the Public Domain http://commons.wikimedia.org/wiki/File%3ADoctor_consults_with_patient_(7).jpg Woman consults with doctor image by Rhoda Baer (Photographer) released into the Public Domain http://commons.wikimedia.org/wiki/File:Woman_consults_with_doctor.jpg 39
Slide 40-

Creative Commons The Audiogram School of Public Health and Family Medicine, University of Cape Town (2010) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 2.5 South Africa License. Please see http://creativecommons.org/licenses/by-nc-sa/2.5/za/ for terms and conditions. All images created by external parties retain their original licenses (see image references on slides). Source work available at vula.uct.ac.za Permissions beyond the scope of this license may be available at www.healthedu.uct.ac.za or healthoer@uct.ac.za 40