AUDITORY BRAINSTEM RESPONSE (ABR)
ABR testing is a non-invasive electrophysiological measurement that allows the audiologist or clinical neurophysiologist to obtain information about the condition/integrity of the auditory nerve. This procedure can also help to predict a child’s hearing thresholds, by using tone bursts (frequency specific ABR). The ABR is an objective test and is used when the baby or infant cannot, or does not respond to behavioral testing, is unable to cooperate or to confirm the audiologists test results.
To be able to perform this test with success it is of utmost importance that the patient must be asleep (natural or with sedation) for at least 60-90 minutes. Chloralhydrate or conscious sedation is used to sedate the patient. An anaesthetist is consulted to assist us with the sedation.
AUDITORY STEADY STATE RESPONSE (ASSR)
The ASSR test is a brain evoked potential (another type of electrophysiological measurement). The ASSR is part of a test battery and is a tool that is used to predict behavioral auditory threshold levels in any age group. It is useful to confirm a severe or profound hearing loss or the amount of residual hearing when no ABR responses could be elicited at maximum stimulation levels.
VNG (VIDEO-NYSTAGMOGRAPHY / ENG (ELECTRO-NASTAGMOGRAPHY)*
Dizziness and/or Balance disorder testing. The VNG/ENG gives objective clinical information by observing the patient’s eye movements. The primary purpose of the test is to monitor nystagmus during visual and vestibular stimulation. The test helps to distinguish between a peripheral or central balance disorder. The caloric test (irrigate the ear with cold and hot air) can give an indication whether a peripheral dysfunction is right or left (thus lateralize).