Its an useful test in perilympatic fistula cases. But can someone explain how it works exactly . Thanks.
I once tested a young adult with congenital deafness, worse at mid-frequencies. She had seen 4 leading UK experts who had all diagnosed autism, but none placed any any importance on the unusual deafness. Suspecting a perilymph fistula, I asked specifically if her hearing varied. She said Yes, so I tested her with earphones in various head positions. Her PTA threholds at high tones (from memory) varied consistently by up to 60dB with head/body position. I concluded the most likely explanation was air bubbles moving around inside the cochlea. She was very pleased to be issued with a standard body hearing aid.
Thank you sir. So is it the air bubbles in the cochlea which cause the improvement in hearing after a patient of perilymph fistula lies down and gets up? Sir is there any particular method of doing this test?
in perilympatic fistula cases in different positions there will be variation in hearing.This may be suggestive of a leak from the fistula