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  • Title: Hearing loss in middle-aged subjects with type 2 diabetes mellitus.
    Author: Ren J, Zhao P, Chen L, Xu A, Brown SN, Xiao X.
    Journal: Arch Med Res; 2009 Jan; 40(1):18-23. PubMed ID: 19064122.
    Abstract:
    BACKGROUND: Complications of type 2 diabetes mellitus (T2DM) can result in hearing loss, which is characterized by high-frequency sensorineural hearing impairment and accelerated age-related decline of the right ear advantage. This investigation aimed to determine which auditory functions are affected in middle-aged subjects with T2DM and the change of the right ear advantage. METHODS: We assessed the auditory function of 50 diabetic and 50 healthy subjects using pure-tone audiometry, auditory brainstem response and otoacoustic emissions. RESULTS: Diabetic subjects showed elevated thresholds at 4000 Hz and 8000 Hz (p <0.01) and increased wave V and interwave I-V latencies (p <0.01) when compared to healthy subjects. Consistently, subjects with diabetes also had smaller distortion product otoacoustic emission amplitudes at 2.0, 3.0 and 4.0 kHz (p <0.01) and smaller transient otoacoustic emission amplitude in the right ear when compared to healthy controls (p <0.05). Meanwhile, the right ear transient otoacoustic emission amplitude of subjects with T2DM was smaller than the left ear at 4.0 kHz (p <0.05). CONCLUSIONS: Our data suggest that middle-aged subjects with T2DM have subclinical hearing loss, impaired auditory brainstem response and diminished otoacoustic emissions, and the peripheral right ear advantage is being lost in middle-aged subjects with T2DM.
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