Proposed Recommended Procedure for the Use of OAEs in Hearing Conservation: a Delphi Exercise
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1 Proposed Recommended Procedure for the Use of OAEs in Hearing Conservation: a Delphi Exercise ENT/SAAA/SASLHA conference Bloemfontein 30 September 2013
2 Acknowledgments Alison Codling-Health and Safety Laboratory UK Occupational Health Practitioner Clare Forshaw- Health and Safety Executive UK Health and Safety Policy Bart Vinck University of Pretoria Audiologist Members of the OAE web-community forum Various ENTs, Audiologists, Policy, OHPs, Hearing Conservation, Researchers Slide 2 CSIR 2010 Slide 2
3 Outline Introduction Methodology Results Future plans Slide 3 CSIR 2010 Slide 3
4 Introduction NIHL = reduced worker quality of life + compensation costs If we are to prevent NIHL need early identification The audiogram = subjective method that relies on co-operation from the worker Alternative or adjunct approach is an objective testing method - OAEs Metropolitan Police exemption from using HPDs Slide 4 CSIR 2010 Slide 4
5 Methodology Delphi technique a widely used and accepted method has been used in various fields of study such as program planning, needs assessment, policy determination, and resource utilization for gathering data from experts in a particular domain to develop a full range of alternatives, explore or expose underlying assumptions, as well as correlate judgments on a topic spanning a wide range of disciplines. Slide 5 CSIR 2010 Slide 5
6 Methodology designed as a group communication process aims to achieve a convergence of opinion on a specific realworld issue well suited as a method for consensus-building Techniques used - Conference telephonic calls discussions and records Committee meetings Formal conference or seminar Electronic conferencing Slide 6 CSIR 2010 Slide 6
7 Objective To develop an agreed upon standardised method of using OAEs in health surveillance for Hearing Conservation To develop agreed upon criteria to interpret outcomes of OAE levels Slide 7 CSIR 2010 Slide 7
8 Methodology Expert colloquium UK 2011 Web-community Literature review Workshop at CSIR in November 2012 Regular meetings - local and international electronic/in person Alison Codling, Clare Forshaw Bart Vinck David Kemp Equipment suppliers Slide 8 CSIR 2010 Slide 8
9 Methodology Survey of current methods used Circulated to known users and interested parties Based on outcome developed a recommended procedure Circulated on web-community Slide 9 CSIR 2010 Slide 9
10 Results OAEs are a feasible alternative Large body of research in laboratory- mainly diagnostic Clinically sensitive tool for assessing NIHL and the outer hair cells (OHC) repeatable results identify cochlear damage before evidenced on an audiogram normal audiogram but evidence of OHC loss Feasible method of evaluating HPD effectiveness using temporary emission shift (TES) Slide 10 CSIR 2010 Slide 10
11 Results Reliable OAE test results require: Normal middle ear functioning- need tympanogram and reflex arc test Relatively quiet room- there should be an acceptable difference between the emission level and the noise floor (SNR) Hearing threshold levels impact on results- must use DPOAEs and diagnostic test protocol Slide 11 CSIR 2010 Slide 11
12 Results Expert forum in UK in 2011 Conclusion: No accepted standardised method of using OAEs part of health surveillance No agreed upon criteria to evaluate what changes in OAE levels indicate a change in OHC function. Slide 12 CSIR 2010 Slide 12
13 Recommended Procedure Otoscopic examination Reason for activity Tester requirements Equipment requirements Test parameters Result interpretation Outcome activity Identify cerumen Right and left ear sequentially. Otoscope. Record result in medical records. View tympanic membrane. If obstructed with cerumen arrange for removal. Proceed to impedance test. Slide 13 CSIR 2010 Slide 13
14 Recommended Procedure Tympanometry Reason for activity Measure middle ear pressure Tester requirements Right and left ear sequentially. Equipment requirements Automated tympanometer. Ear nubs of correct size to cause a sealed external ear. Using a 226 Hz probe tone. Test parameters Tympanic membrane mobility. Middle ear Impedance. Result interpretation Type A tympanograms. Peak values comprised from 0.5 to 1.6 ml at ±50 dapa. Outcome activity Proceed to acoustic reflex. Slide 14 CSIR 2010 Slide 14
15 Recommended Procedure Reflex Reason for activity Tester requirements Equipment requirements Test parameters Result interpretation Outcome activity Confirm clear middle ear pathway. Right and left ear sequentially. Tympanometer with acoustic reflex test. 1kHz at 100dB. Reflex present. Proceed to DP OAE test. Slide 15 CSIR 2010 Slide 15
16 Recommended Procedure Reason for activity DPOAE Tester requirements Equipment requirements Test parameters L1/L2 = 75/70 db Cochlear function. Right and left ear sequentially. DPOAE Machine. F2 frequencies = 1/8 frequencies per octave i.e. 814Hz,917Hz,1000Hz,1091Hz, 1189Hz,1297Hz,1542Hz,1682Hz, 1834Hz,2000Hz,2181Hz,2378Hz,2594Hz 2828Hz, 3084Hz,3364Hz,3668Hz, 4000Hz,4362Hz,4757Hz, 5187Hz,5657Hz, 6169Hz, 6727Hz,7336Hz,8000Hz Slide 16 CSIR 2010 Slide 16
17 Recommended Procedure Interpretation guidelines SNR = 6dBSPL at a minimum of 2 frequencies. Establish baseline initially. If >3dBSPL reduction in DPOAE emission strength from previous test, replicate the test in the individual. This can be at a time period suitable for tester. It can be immediately based on consideration of possible confounding factors for test results i.e. TTS, ill health etc.). Following re-test; take the better set of results as the outcome of test. Slide 17 CSIR 2010 Slide 17
18 Recommended Procedure Interpretation guidelines If 3-5dBSPL reduction in emission from previous test at any frequency counsel client and warn of deterioration. Review other results on similar exposed workers. If similar or greater deterioration in one or more similarly exposed workers there is a need to review noise management procedures to ensure protection is being ensured (i.e. controls, PPE, supervision etc.). Slide 18 CSIR 2010 Slide 18
19 Recommended Procedure Interpretation guidelines If 5-10dBSPL reduction in emission from previous test at any frequency counsel client and warn of deterioration. Consider referral for PTA/diagnostic testing. Review other results on similar exposed workers. If similar or greater deterioration in one or more similarly exposed workers there is a need to review noise management procedures to ensure protection is being ensured (i.e. controls, PPE, supervision etc.). Slide 19 CSIR 2010 Slide 19
20 Future plans Equipment suppliers Record keeping and use of results Slide 20 CSIR 2010 Slide 20
21 Future plans Qualitative study in UK Launch in November Bart Vinck UK occupational health practitioners Slide 21 CSIR 2010 Slide 21
22 Future plans Quantitative study in SA SA mines Three commodities Gold, Platinum and Coal Process has begun Longitudinal study of three to four years Slide 22 CSIR 2010 Slide 22
23 Thank You Questions? NIHL Slide 23 CSIR 2010 Slide 23
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