Verification of the air-bone gap using cancellation and evoked responses.
Using the cancellation method as well as evoked responses, we investigated their application in the estimation of the air-bone gap in patients undergoing operation on middle ear structures. The cancellation method had a closer relationship with pure-tone audiometry than evoked responses in predicting the air-bone gap. This was caused by recruitment, by which the cancellation method was not affected. The results of brainstem-evoked responses to bone and air conduction signals showed therefore an underestimation in the prediction of the air-bone gap. Combining the cancellation method with evoked responses elicited to air conduction signals permitted the estimation of the cochlear reserve without the need of threshold measurement by bone conduction.
D000328:Adult; D000368:Aged; D001301:Audiometry, Pure-Tone; D001309:Auditory Threshold; D001844:Bone Conduction; D004432:Ear, Middle / Q000601:surgery; D005072:Evoked Potentials, Auditory; D005260:Female; D006314:Hearing Loss, Conductive / Q000175:diagnosis / Q000601:surgery; D006319:Hearing Loss, Sensorineural / Q000175:diagnosis / Q000601:surgery; D006320:Hearing Tests / Q000295:instrumentation / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011930:Reaction Time; D012000:Recruitment Detection, Audiologic