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Cross and Bi Cross Hearing aid fitting
can any one share their clinical experience of Cross and BiCross Hearing aid fitting .
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I have fitted many CROS and BiCROSS aids. Personally I provide a free trial period with both the BiCROSS and then with a Unilateral fitting with a highend product. In some instances the patient will choose the monaural fitting (cost and or cosmetics of wearing one aid vs two). The new BiCROSS aids have been improved and most of the patients who have been wearing older versions can hear the difference. Like any fitting, the patient must wear the BiCROSS in their home, work and social settings so the aid can be programmed appropriately. As you know everyones brain processes sound differently. I am a fan of Cross and BiCross aids.
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As an audiologist and BiCROS user, I think that the most important aspect of fitting CROS/BiCROS hearing aids is ensuring that the user knows how this type of hearing aid system will work and that it has limitations. Certainly good at overcoming the head shadow effect and enabling detection of sound from side of the poorer ear. However, improved localisation and speech understanding in noise are unlikely benefits.
Although I'm not aware of any studies which have investigated this, my experience is that, if the right ear is the poorer, unaidable ear, speech understanding in noise remains a particular problem and more so than if the left ear is the poorer ear. I have assumed that this is a right ear-dominance effect as speech is maiinly processed in left hemisphere of the brain but that's speculation on my part!