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Electrically Evoked Stapedius Reflex Measurements in Cochlear Implantation and Its Application in the Postoperative Fitting Process
Published on: June 21, 2024
Wideband acoustic immittance measurements in assessing crimping status following stapedotomy: A temporal bone study
Inge Wegner1,2,3, Navid Shahnaz4, Wilko Grolman1,2
1a Department of Otorhinolaryngology - Head and Neck Surgery , University Medical Center Utrecht , Utrecht , The Netherlands.
Objective:
To ascertain if wideband acoustic immitance (WAI) measurements are useful in assessing crimping status following stapedotomy.
Design:
WAI measurements were obtained using the Mimosa Acoustics HearID system. Wideband chirp sound stimuli and a set of tone stimuli for nine frequencies between 0.2 and 6 kHz were used at 60 dB SPL. Five sets of measurements were performed on each temporal bone: mobile stapes, stapes fixation and stapedotomy followed by insertion of a tightly crimped, a loosely crimped and an uncrimped prosthesis.
Study Sample:
Eight fresh-frozen temporal bones were harvested from human cadaveric donors.
Results:
At lower frequencies, up to 1 kHz, stapes fixation decreased absorbance. Compared to the baseline absorbance, absorbance with stapes fixation dropped by 6 to 17% in absolute terms from the baseline value (p = 0.027). Absorbance was not affected in higher frequencies (p = 0.725). Stapedotomy changed the absorbance curve significantly compared to the normal condition with an increase of absolute absorbance values by 6 to 36% around 0.25-1 kHz (p-value <0.01). The crimping conditions did not differ from one another (p = 0.555).
Conclusion:
WAI is not useful in distinguishing between tightly crimped, loosely crimped and uncrimped stapes prostheses following stapedotomy.
