摘要
Abstract
Objective To compare the presence of tone burst evoked CMs and DPOAEs at corresponding frequen-cies in adult normal and hearing-impaired ears, and determine the clinical value of tone burst evoked CMs in testing hearing in adults. Methods CMs and DPOAEs evoked by 500 Hz, 1000 Hz and 2000 Hz tone bursts were obtained from 68 ears in 34 adults with normal hearing, and from 27 ears in 23 adults with mild hearing loss and 22 ears in 19 adults with moderate hearing loss. The rates of presence of CMs and DPOAEs were compared. Results The rate of CM pres-ence in ears with normal hearing was 100%at 500 Hz and 1000 Hz and 86.76%(59/68) at 2000 Hz, and that of DPOAE presence was 76.47%(52/68) at 500 Hz and 100%at 1000 Hz and 2000 Hz. The rate of CM presence at 500 Hz was higher than that of DPOAE (P<0.05). For ears with mild hearing loss, CMs were present in 85.19%(n=23), 81.48%(n=22) and 37.03%(n=10) of the 27 ears at 500 Hz, 1000 Hz and 2000 Hz, respectively;while DPOAEs were present in 29.63%(n=8), 51.85%(n=14) and 44.44%(n=12) of the ears, respectively. CMs were present in more ears at all tested frequencies than DPOAEs for these ears (P<0.05). For ears with moderate hearing loss, CMs were present in 77.27%(n=17), 77.27%(n=17) and 27.27%(n=6) of the 22 ears at 500 Hz, 1000 Hz and 2000 Hz, and DPOAEs were present in 13.64%(n=3), 40.91%(n=9) and 40.91%(n=9) of the ears at corresponding frequencies, respectively. Again, CMs were present in more ears than DPOAEs at all tested frequencies in these ears (P<0.05). Conclusions The results suggest higher rates of CM detection at middle and low frequencies compared to DPOAEs, which can be used as a supplement to the sometimes difficult to interpret DPOAE evaluation at these frequencies. We recommend combining CMs and DPOAEs in the evaluation of cochlear function.关键词
耳蜗微音电位/畸变产物耳声发射/短纯音/耳蜗/蜗性聋Key words
Cochlear microphonics/distortion product otoacoustic emissions/tone burst/cochlea/cochlear deaf-ness分类
医药卫生
