Training in ABR

Can Eclipse do Non-Sedated ABR Testing?

Advanced
10 mins
Reading
04 September 2017

I wanted to know whether the Eclipse can be used to do ABRs on children that are not sedated (e.g. a 4-year old looking at an iPad). Is sedation essential with children when using the Eclipse? 

Answer: The Eclipse can do ABR and this procedure can, in principle, be applied to patients of any age.

This is fine, except that the vast majority of patients we see are not in the age group where awake ABRs are necessary. We typically see either infants who sleep naturally, or we see adults who can be relied upon to cooperate and lie still (and perhaps nod off). The children in the age group we are talking about here (let us say 2+ years) are less frequently seen for ABRs because most can perform behavioural testing.

With ABR testing it is always easier to have a quiet (asleep) patient and far harder with an awake patient because of the greater myogenic noise (through movement and so on) which impacts negatively on the signal-to-noise ratio. If an ABR is definitely needed in a child at this age then one option is to do the test during periods of natural sleep (e.g. pay them a home visit in the evening and test the child when they are in natural sleep at home in bed) or if that does not work then it might be necessary in some cases to resort to sedation.

Aside from these ideas, there are a number of features on Eclipse that help to make recording in adverse recording conditions more practical.

If the noise is aperiodical, like movements when you have a patient who is not always lying completely still throughout the recording process then perhaps the most important feature to aid recording is the Bayesian weighted averaging. This will reduce the influence of sweeps that contain movement artefacts. In addition of course, you have the artefact reject options, which can be fine-tuned at any point during testing. Do not forget also that using the CE-Chirp® stimuli will maximise SNR, but through increased signal rather than decreased noise.

Presenter

Michael Maslin
After working for several years as an audiologist in the UK, Michael completed his Ph.D. in 2010 at The University of Manchester. The topic was plasticity of the human binaural auditory system. He then completed a 3-year post-doctoral research program that built directly on the underpinning work carried out during his Ph.D. In 2015, Michael joined the Interacoustics Academy, offering training and education in audiological and vestibular diagnostics worldwide. Michael now works for the University of Canterbury in Christchurch, New Zealand, exploring his research interests which include electrophysiological measurement of the central auditory system, and the development of clinical protocols and clinical techniques applied in areas such as paediatric audiology and vestibular assessment and management.

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