Auditory neuropathy spectrum disorder (ANSD): a distortion product otoacoustic emissions (DPOAEs) study

Abstract Background Auditory neuropathy spectrum disorder (ANSD) is characterized by normal OHCs function as shown intact cochlear microphonics (CMs) and/or otoacoustic emissions (OAEs); absent or grossly abnormal auditory brainstem responses (ABRs) and middle ear muscle reflexes. This study designed to address whether the input/output of distortion product OAEs (DPOAEs I/O) in ANSD patients similar different from hearing subjects. work included 2 groups: control group (GI) composed 20 subjects (GII) consisted with ANSD. All cases were subjected basic audiological evaluation, DPOAEs I/O recorded at four frequencies 2f1-f2 5 intensity levels L1 L2. Results amplitudes significantly higher when compared control. The pattern was it dependent on frequency stimulus. Conclusions Despite recordings patients, their DP are that finding suggested OHC activity patients.