Welch Allyn REF 29400 Especificaciones descargar pdf (Pagina 20)

Welch Allyn OAE Hearing Screener Directions for Use 705353 Rev F

Obstructions

Problem

Possible solutions

♦ Cerumen, vernix, or other debris

— In the ear

— On the probe tip

— On the probe

♦ IN THE EAR:

— Make sure that a properly trained technician examines

the ear canal for obstructions BEFORE inserting the

probe.

— Delay testing newborns until 11 hours after birth, if

possible.

(Note: 'Refer' results caused by vernix decrease

with each hour after birth.)

♦ ON THE PROBE TIP:

— Remove, discard, and replace the probe tip before

each test (optimal).

— Remove, examine, and wipe probe tip clean; make

sure that both the inside and outside of the tip are

clean; replace cleaned probe tip.

♦ ON THE PROBE:

—

Clean the probe carefully by following the instructions

in the Directions for Use guide.

♦ Temporary collapse of the ear canal

— Occurs often with "down ear" when infant

is lying on side.

— Collapse is normal because bones

haven't formed in ear yet.

♦ Manipulate the ear in a gentle, circular motion before

inserting the ear tip.

♦ Make sure to have a good probe fit.

♦ If infant is lying on side, reposition infant so that down ear

faces up; ask attending nurse or parent to keep infant in

this position as much as possible; wait a few hours before

testing "down" ear.

Cochlear Outer Hair Cell Loss

♦ Hearing loss

—

Problems include communication difficulties in noisy environments and speech and language development

delays.

♦ Refer on OAE and not on Pure Tone Audiometry

— Occurs most frequently in people exposed to high levels of sound energy (noise or music) or those treated

with ototoxic medications.

— OAE responses are often affected before evidence of hearing threshold change appears on a behavioral

hearing test.

False Positives

♦ 'Refer' criteria maximizes the detection of individuals with true hearing impairment.

♦ A small percentage of people with normal hearing sometimes get a 'Refer' result.

—

These are people whose OAE responses fall below the 10th percentile for the normal population.

—

Such low OAE responses warrant additional testing.

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