Bio-logic

Scout Oto-acoustic Emissions Quick Guide Rev C

Quick Guide

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Bio-logic Systems Corp. Scout Oto-acoustic Emissions Quick Guide Test procedure ♦

Reduce noise in test area as much as possible

♦

Assure that patient remains as quiet and still as possible

- If using default protocol, begin test by clicking on Right or Left ear icon

♦

Swaddle infant

- Enter “Patient Information” (optional)

♦

Clip probe to patient’s clothing or other stationary object to cut down on noise

- Select OK

Insert probe firmly into ear canal

- Collection begins automatically

Probe issues ♦

Select a probe tip that will fit firmly into the patient’s ear

- The Treetip is appropriate for most newborns ♦

♦

Verify that no hard surfaces are exposed at the end of the ear tip that will be inserted into the ear canal

♦

Dispose of ear tip after each patient

Verify that the disposable ear tip is placed all the way on the probe tip

Protocols ♦

To use different protocol:

- Choose Setup/ Select Protocol ♦

To make this the new default protocol:

- Select Save Protocol - Select OK when prompted (Note: cannot overwrite Pass/Refer DPOAE Protocols)

- Choose Setup/ Default Protocol

♦

- Select OK when prompted

- RENAME Protocol

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To modify a protocol:

- Make desired changes to Collection Parameters, Display Parameters, and/or Advanced Parameters

To Create a new protocol:

- Make desired changes to Collection Parameters, Display Parameters, and/or Advanced Parameters - Select Save Protocol - Select OK when prompted

590-SCTQT1 Rev C

Opening Patient Data File ♦

Select File/ Open Patient Data File

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Highlight up to six files

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The “Patient Information” of the last file selected will appear to the right

♦

DPOAE files may be displayed Superimposed, Separate, or Right/Left Side by Side

♦

Search files by patient last name (optional)

Individual point data information may be analyzed:

- Click on a point on the DP-gram ♦

TEOAE files may be displayed only as Separate

Analyzing data ♦

To choose a reference set for DPOAE data:

- Select Setup/ Display parameters

♦

To display reference set for DPOAE data:

- Select Analysis/Activate Display setup

- Select Reference set from drop down menu - Select “OK”

Explanation of Expanded Boystown Reference set ♦

Expanded Boys Town-normal:

- DP above the top lines suggests normal OAE function and therefore probably suggests normal hearing since so few impaired fall at or above the top lines ♦

♦

Expanded Boys Town-indefinite:

- Between the 2 sets of lines, there are normal subjects with low amplitude DP or hearing impaired with robust emissions. Probably not worse than mild loss

Expanded Boys Town-abnormal:

- DP below the bottom lines suggests abnormal OAE function or inability to measure a response (middle ear) since so few normal subjects have amplitude that low (i.e. DP approximately equal to NF)

Corporate Headquarters: One Bio-logic Plaza Mundelein, IL 60060 (847) 949-5200 (800) 272-8075 – Audiology and Hearing Technical Support (847) 949-8615 – Fax (800) 456-5205 – Supplies (847) 949-0219 – Fax Supplies www.bio-logic.com

European Representative: MDCI Arundel House Liverpool Gardens Worthington West Sussex, BN11 1SL UK

590-SCTQT1 Rev C

Bio-logic Systems Corp. Scout Oto-acoustic Emissions Troubleshooting Guide Troubleshooting the Probe (580-PROAE3) Semi-disposable probe only

! For detailed probe instructions, please see 591-PROBIN Communicaton Fault ♦

Check for AC or DC power to AuDX Plus or Sport.

♦

Check for AC power to Bio-logic hardware box (ABaer/ Navigator Pro).

♦

Check both ends of communication cable for bent or broken pins. If no damage is seen, firmly reconnect.

♦

Disable any conflicting software and hardware such as screensavers, power management, schedulers, and hearing aid fitting programs.

♦

To check connection without initiating a test, select Collect/Reset Hardware.

Factors to consider when interpreting OAE measurements For Low Amplitude Emissions ♦

Confirm that actual stimulus intensities plotted are close to target stimulus intensities.

- If not, be sure probe is still in the ear and that the tubes are attached between the speaker and microphone assemblies. ♦

Check stimulus spectrum to be sure that there are no large dips in ear canal acoustics. Standing waves in ear canal can cause interference in DP of up to 20 dB, especially in high frequency (>7 kHz).

- If there are large dips in stimulus spectrum, try refitting the probe in the ear and repeat the test. Responses will be not repeatable if there is a standing wave. Note: OHCs are pre-neural structures, so it is possible to have no behavioral response to sound, no ABR and normal Otoacoustic emissions (auditory neuropathy). This condition is very rare, however.

Testing Hints ♦

Swaddle baby and position on side for best access to ear.

♦

Test at least 24 hours after birth, if possible, to prevent false positives due to vernix.

♦

If infant fails, re-test at least one more time before discharge.

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♦

If one ear fails, try to have baby lay so that the failed ear is facing up for a while to clear vernix before retesting.

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If infant is fussy or crying, offer a pacifier.

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OK to test while infant is nursing.

Using the Test Cavity ♦

Place a TreeTip on the Probe.

♦

Insert the probe securely into the test cavity.

♦

Perform test on Scout as usual. Test results should show a “Refer”.

♦

If error messages are obtained, follow the troubleshooting suggestions above. ♦

A “pass” result may be observed at individual test frequencies in a DPOAE test due to the resonance properties of a hard walled cavity. But the overall test result should be a “refer”.

European Representative: MDCI Arundel House Liverpool Gardens Worthington West Sussex, BN11 1SL UK

590-SCTQT1 Rev C

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