In a sudden hearing loss patient, will steroid injection in the inner ear affect IPSI and Contra ABR results?
"In a sudden hearing loss patient, will steroid injection in the inner ear affect IPSI and Contra ABR results?"
Do you mean steroid injection into the middle ear, not in the inner ear . New modern version of ABR can be applied even in presence of ME effusion. Regarding injection of steroid into middle ear, will not affect as steroid will be already drained via Eustachian tube & that is why we ask patient to not swallow pre & post injection to lengthen steroid' presence in middle ear as long as possible to be effective. Later on before applying ABR, except if it is modern version, you can ask your patient to swallow so as to help the drainage of the rest of drug via Eustachian tube.
If you are asking if the effect if the intratympanic steroids would make any change in the ABR, I would be sceptic.
I f you are just referring to the effect of the middle ear ocupation, the ABR elicited inmediatly after the steroid injection, should be slightly delayed
An added point: Not sure why you are interested in the ipsi/contra ABR, but note that in an adult in response to air-conducted stimuli, the "contralateral" ABR (i.e., recorded with electrode on mastoid/earlobe contralateral to the stimulated ear) does NOT represent different pathways than that recorded in the ipsilateral channel. Rather, it is a view of the same generators from a different angle.
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