Probe Microphone Measurements - International Hearing Societyihsinfo.org › IhsV2 ›...
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Probe Microphone Measurements
Presenter:
Wendy Switalski, AuD, MBA
Audiology Development Manager
Audiology Systems, Inc.
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Enhancing Fitting Quality using PMM
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• 2 Groups: Above-Average Success Below-Average Success
• Examined ‘fitting protocol’ used (as reported by patient**)
• Significant differences found in components
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Why is it important?
• Repurchase HA Brand: 81% vs. 14%
• Recommend HHP: 94% vs. 39%
• Would recommend HA: 97% vs. 56%
• Satisfaction with benefit: 99% vs. 12%
• HA in drawer: 3% vs. 18%
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‘Successful’ patients reported receiving the following :
1. OBJECTIVE BENEFIT Assessment (+26%)
2. SUBJECTIVE BENEFIT Assessment (+25%)
3. LOUDNESS DISCOMFORT Measure (+24%)
4. REAL-EAR MEASUREMENT (+20%)
5. PATIENT SATISFACTION Measurement (+17%)
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• High correlation between patient success and number of visits
• 76% with above-average success fit in 1-2 visits
• 47% with below-average success fit in 5-6 visits…versus 7% of the above-average group
• So clinical expertise, diligence and attention are not enough…
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• Use Patient Reports/Acceptance of Sound Quality as goal
• Manufacturer’s Algorithm(s) determines initial settings
• Patient’s subjective opinions are used for gain and sound quality fine tuning
FITTING A: Manufacturer’s First Fit
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Source: H. Aazh and B. Moore, Journal of the American Academy of Audiology; 18:653–664 (2007)
9
M1 M2 M3 M4
64% of “first-fit” hearing aids did NOT come within +/- 10 dB of NAL-NL1 target at 1 or more frequencies
FITTING A: Manufacturer’s First Fit
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• Patient performance reports
• Significant other performance reports
• Lack of compliants
• Patient decision to continue use of hearing aids
FITTING A: Quality Markers
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• Use Dynamic Range as Goal
• Verify using Live Speech
• Measurements made with Speech Peaks
FITTING B: First Fit with Verification
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FITTING B: First Fit with Verification
Quality Markers:
• Examine output for varying input levels
• Check for unusual peaks
• Verify loud inputs do not exceed LDL’s
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• Use Prescriptive Target as goal
• Verify using Recorded Speech-Like Stimuli
• Measurements made with LTASS and/or Speech Envelope (Percentiles)
FITTING C: Prescriptive Target Fitting
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Quality Markers:
• Fit To Target
• Speech Intelligibility Index (SII)
• In-Depth analysis of Dynamic Range utilization
FITTING C: Prescriptive Target Fitting
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Evaluate Openness of Fit
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• Step Two: Unaided Response
• Measure resonance of patient’s ear canals
• Expect ‘natural gain’ of ~ 12-15 dB in area of 2700 Hz
• Historically was used for Insertion Gain techniques…but has a ‘new use’
Evaluate Openness of Fit
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• Step Three: Occluded Response
• Place hearing instruments in ears, holding probe tubes to maintain placement
• Place in MUTE or OFF position
Evaluate Openness of Fit
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Is my Open Open? Yes
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• When this is good: If you have planned for a truly open fitting for a client with normal low-frequency thresholds.
• When this is not good: If your amplification goals require low frequency gain or greater power than can be easily offered in the open configuration, this result suggests the need to change to a larger or more occluding "power" dome or consider a custom mold.
Is my Open Open? Yes
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Is my Open Open? No
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• When this is good: For fittings that require more power, this minimizes the opportunity for feedback occurrences, and simultaneously maximizes available gain. • The most effective "feedback management" encompasses both physical
fitting characteristics (optimized dome/ear canal match) in addition to digital instrument capabilities.
• When this is not good: This finding may be problematic when you have recommended an open fitting for a client with narrow ear canals, and you started with the smallest dome available.
Is my Open Open? No
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• In a fitting that shows any level of occlusion, changing to a truly open configuration by selecting a smaller or more vented dome (if not contra-indicated by power needs) can have a dramatic and sudden positive effect.
• Conversely, in a fitting that is confirmed to be open, own-voice issues may require minor frequency response adjustments in the hearing instruments and/or counseling of the client.
• Remember…1-2 visits!
Why does it Matter? Occlusion v. Ampclusion
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• Informs you whether to use ‘standard’ calibration procedures or OpenREM calibration. If the measurements reveal complete occlusion there is no need to use OpenREM calibration.
Why does it Matter? Calibration Choice
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• Standard calibration = calibration tone occurs prior to each and every stimuli presentation and reference mic stays active during process
• OpenREM Calibration = stored equalization measured once with HI in place and muted or off; and then eference mic disabled. Remeasure if conditions change (i.e. patient moves).
Why does it Matter? Calibration Choice
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• Defines the gain recommended across the frequency spectrum, based on hearing levels and other considerations.
• Primary Options: DSL v5.0; NAL-NL2.
• Both of which are evidence based with a host of literature validating them as tools for best practice
Prescriptive Fitting – The Basics
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Prescriptive Fitting – The Basics
• Uses speech or speech-like signals as stimulus of choice
• Provides different targets for soft, average, and loud inputs
• Provides a consistent fitting approach regardless of make, model, manufacturer of device
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• PREMISE: Loudness EQUALIZATION
• Aims to equalize perception of loudness over a range of frequencies instead of having low frequencies dominate loudness
• maximizing predicted speech intelligibility while constraining loudness
• EVOLUTION:
• From LINEAR approach to COMPRESSION approach.
• From INSERTION-GAIN (tones) to include AIDED Gain (speech) targets
• VALIDATION/EVIDENCE: modifications from NAL-NL1 included patient preference/comfort findings
NAL-NL2
Johnson, E. and Dillon, H., 2011
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NAL-NL2 Fitting Details
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NAL-NL2 Target example
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NAL NL-2 Targets for Various Stimuli
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• PREMISE: Loudness NORMALIZATION – Aims to restore, at each frequency loudness perception of the hearing
impaired listener to that of a normal hearing listener – Goals of avoiding loudness discomfort, providing audibility of speech
across a wide range of input levels, and accommodating the prescriptive targets for both quiet and noisy environments, as well as for infants versus children versus adults
• EVOLUTION: – **From pediatric-focus (earlier versions) to both pediatric and adult
versions.** – Modifications for ‘noise programs’ made – Correlates with data on Preferred Listening Levels (PLL)
Desired Sensation Level Multistage Input/Output (DSL m[i/o])- DSL v5.0
Johnson, E. and Dillon, H., 2011
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DSL v5 Target Example
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DSL v5 Targets for Various Stimuli
Tones vs Speech
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DSL v5 Fitting Details
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What they share in common…
• Evidence based prescriptions with a host of literature validating them as tools for best practice
• Use speech-like signals as stimulus of choice
• Differing targets for soft, average, and loud inputs
• Provide a consistent fitting approach regardless of make, model, manufacturer of device
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NAL2 vs DSLv5- Where are they now? Soft (55dB) input
Purple = DSL5 (Adult) Orange = NAL-NL2 (Adult)
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NAL2 vs DSLv5- Where are they now? Average (65) input
Blue = DSL5 (Adult) Green = NAL-NL2 (Adult)
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Another Word About Prescription Targets
• Remember, a proprietary hearing aid manufacturer’s algorithm is NOT necessarily the same thing as NAL or DSL (and note that their proprietary method may be the default fitting formula)
• If you fit with formula ABC don’t expect it to match DSL on NAL…but you can use it as a starting point to get to a prescriptive target match
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What You See on the Manufacturers’ Screen May Not Be What’s Happening In the Ear
Source: H. Aazh and B. Moore, Journal of the American Academy of Audiology; 18:653–664 (2007)
40
M1 M2 M3 M4
64% of “first-fit” hearing aids did NOT come within +/- 10 dB of NAL-NL1 target at 1 or more frequencies
And Just One More Word…
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• The ‘What If’ Issues…
• What if they don’t like it?
• What if they want a detailed explanation?
• What if I cannot match target?
Prescriptive Fitting
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• The ‘What If’ Issues…
• Basis for Prescriptive Targets • Based on research regarding hearing loss AND
• Hearing aid user preferences
• A GREAT PLACE TO START
Prescriptive Fitting
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Let’s see it done…
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Adding a layer: Percentile Analysis
• Statistical method which evaluates the dynamic properties of the measured signal displaying the LTASS, the peaks and the valleys.
• The 99th percentile curve: the peaks of speech.
• The 30th percentile: the valleys of speech.
• Can see how much of the signal fits into the clients available dynamic range.
• Can recognize the effects of signal processing on the input signals
EUHA/AHA, 2011.
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Percentile Analysis
LTASS
PEAKS
VALLEYS
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Percentile Analysis
LTASS
PEAKS
VALLEYS
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Aided Response – an Example
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The added value of Percentile Analysis
• Visualizing the impact of compression settings on the signal arriving at the eardrum.
• Detailed assessment of HI features.
• Enhancement to the HI transition procedure.
• Explaining when targets are at or below threshold, or adding information when target cannot or is not met.
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Percentile Analysis - Compression View
Add arrows to show compression at low/high diff. in dynamic range
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Ave (percentiles) – use 65dB Input
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Soft (percentiles) – use 55dB Input
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Loud (percentiles) – use 75-80dB input
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Speaking of not matching target…why is the target below audibility?
• Restoration of LTASS audibility of high frequencies is not always desirable.
• Prescribed gain to achieve audibility at higher frequencies may not be achievable.
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MPO – Let’s See It Done…
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A few comments…
• Manufacturer Preferred Algorithm
• Up versus Down; Frequency smoothing
• A contest between devices?
• The great equalizer
• Focus on product features, service options, support
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Let’s Check with The Patient….
•Cox Loudness Scale
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Loudness Acceptance
•Cox Loudness Scale
•GOOGLE:
memphis
cox
loudness
HARL
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Loudness Acceptance
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Loudness Acceptance
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Loudness Acceptance
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Loudness Acceptance
• Compare to Unaided
• Compare to Significant Other
• Decide to modify
• Consider Re-measuring Aided Responses
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Loudness Acceptance – Let’s See it Done…
• Compare to Unaided
• Compare to Significant Other
• Decide to modify
• Consider Re-measuring Aided Responses
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No verification Verification
Coupler Real Ear
Approach
First Fit only based on
audiogram
First Fit using measured
REUG/RECD
Verification in coupler using
predicted data
Verification in coupler using
measured data
Verification in real ear using
predicted REUG/RECD
Verification in real ear using
measured REUG/RECD
REUG/RECD Predicted Measured - read
from NOAH Predicted Measured Predicted Measured
Pediatric application X X X X > 5 yo > 5 yo
Adult application X X X X X X
Fitting software X X X X X X
HI Programming Interface
X X X X X X
AURICAL HIT (X) X X X
AURICAL FreeFit (X) X X X
Predictability of fitting quality: Pediatric
0 QQ QQ QQQQ QQQQQ QQQQQQ
Predictability of fitting quality: Adult
Q QQ QQQ QQQQ QQQQQ QQQQQQ
Quality improvement journey
Courtesy of Peter Kossek, Otometrics
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Questions?
Please complete an
Evaluation Form for
this seminar
These presentations slides will be available to download at ihsinfo.org/convention
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Taking customer care to a new level
THANK YOU!
www.AudiologySystems.com
Or please call us at:
855-283-7978
You can also find additional fitting resources at:
http://www.otometrics.com/Knowledge-Center/fitting