Operation Manual easyScreen
8508935 Rev. 4
47
04/04/2019
5.8.1.2 Acoustic Noise
Acoustic noise in the screening environment can be so loud that the low-level stimulus
delivered by the hearing screening system is overwhelmed by the background noise.
Acoustic noise can also awaken the baby causing less than optimal recording
conditions and artifacts that prolong the test time. Acoustic noise can lead to a Refer
result even for a baby with normal hearing.
What can the screener do to reduce acoustic noise?
•
Find a location for the screening that is as quiet as possible, such as an
unoccupied patient or procedure room.
•
Close the door to the test room to reduce the acoustic noise from others walking
in the hallway who may be talking or pushing equipment that is noisy.
•
Be aware of “hidden” sources of acoustic noise, such as air conditioner vents,
motors from devices. Try to avoid them by moving as far away as possible.
•
Ask others in the test room to suspend talking and mute or turn off radios or TVs
while the test is being performed.
•
Ask parents to take other children
out of the mother’s room during the test.
5.8.1.3 Electrical Noise & ABR
Electrical noise in the screening environment can cause high artifact levels and
generally noisy EEG, prolonging ABR test times and increasing the chance of a refer
result. Electrical noise issues can be very difficult to troubleshoot and avoid in a
hospital environment.
The following can be sources of electrical noise:
•
Other electrical equipment in the test room, especially devices attached to the
baby such as other monitoring equipment.
•
Nearby cell phones, tablets, computers, walkie-talkies.
•
MRI or other radiographic equipment located near the nursery, even on the floors
above or below.
•
RFID tracking devices especially if attached to the baby or mother holding the baby.
If the screener notices high levels of electrical artifact during testing or an increase in
refer rates, these sources of electrical interference should be considered and
eliminated if possible.
The screener may need help from the infant’s nurse or physician
to troubleshoot electrical interference issues if it involves other types of monitoring
equipment attached to t
he baby that are critical to the child’s care.
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