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American Journal of Audiology Vol.16 68-74 June 2007. doi:10.1044/1059-0889(2007/006)
© American Speech-Language-Hearing Association
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Research and Technology | Articles

Stapedial Reflex and Ears With High Static Acoustic Admittance

Jeffrey J. DiGiovanni

Ohio University, Athens

Dennis T. Ries

University of North Texas, Denton

Contact author: Jeffrey J. DiGiovanni, School of Hearing, Speech, and Language Sciences, W222 Grover Center, Ohio University, Athens, OH 45701. E-mail: digiovan{at}ohio.edu.

Purpose: To evaluate modified acoustic reflex diagnostic protocols for a group of individuals (n = 9) with high peak compensated static acoustic admittance (Ytm) tympanograms.

Method: A modified procedure designed to improve acoustic stapedius reflex threshold (ASRT) measurements in individuals with high-admittance tympanograms was employed in both an experimental and a control group. ASRTs were measured at 0.5, 1.0, and 2.0 kHz, ipsilateral and contralateral. Measurements were obtained within each condition for 7 ear canal pressures that were set to 0, ±50, ±100, and ±150 daPa (relative to tympanometric peak pressure [TPP]).

Results: Though measuring ASRTs at –50 daPa (relative to TPP) in the high-admittance and normal groups did not result in significantly better thresholds than at TPP, the absent reflex rate was reduced when the ear canal pressure was changed by –50 daPa during ASRT measurements.

Conclusions: Based on this sample, it is suggested that a patient presenting with high peak compensated static acoustic admittance (peak Ytm ≥ 2.1 mmho) undergo ASRT evaluation with the ear canal pressure set to –50 daPa (relative to TPP).

Key Words: acoustic reflex, immittance, stapedial reflex, high admittance


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