[Analysis of spectral history of distort-product otoacoustic emissions in subjects of transient vertebrobasilar ischemic vertigo].

Analysis of the spectral history of distrot-product otoacoustic emissions (DPOAE) was performed to evaluate the cochlear function in subjects of vertebrobasilar transient ischemic vertigo (VBTIV). Thresholds of pure tone and acoustic reflex didn't increase while the amplitudes of DPOAE decreased, and the spectral history of DPOAE rippled dramastically. 36.8% of cases were found abnormal by the amplitudes and the spectral history of DPOAE. The results confirmed that those patients with mild disfunction of cochlea can be detected by the amplitude and spectral history of DPOAE, which may be useful to differentiate the region of VBTIV.