Acoustic immittance test showed A-shaped tympanometry curves of both ears as well as normal
acoustic reflex thresholds of ipsilateral and crossed stapedius muscles.
For
acoustic reflex thresholds, findings were abnormal if they were unexpectedly absent or elevated based on pure tone findings.
Next the immittance test battery comprising of tympanogram and
acoustic reflex threshold were obtained in each ear separately for each patient.