No abstract

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In a previous investigation into noise-induced hearing loss by comparing 2-month-old albino with pigmented guinea pigs, albinos displayed significantly greater shifts in cochlear microphonic (CM) threshold and less recovery than the pigmented animals 7 days after noise exposure. The present study compared the responses of 14-month-old albino and pigmented guinea pigs to the same noise parameters used previously. Thresholds for the first detectable elicitation of CM for three pure tones were recorded prior to, at 90 min and at 7 days after a 45-min exposure to 126 dB broadband noise. Before exposure to noise, thresholds for pigmented guinea pigs were 24 dB higher than those in the albinos. Following noise exposure, the pigmented animals showed less than half the amount of threshold shift displayed by the albinos. This change ws attributed to the higher pre-exposure thresholds in the pigmented guinea pigs. Converging lines of evidence suggest that cochlear pigmentation may have both protective and toxic influences on the inner ear.

In general, the current study was successful in producing recorded speech materials for Jordanian Arabic population. This suggests that the speech stimuli generated by this study are suitable for measuring speech recognition in Jordanian Arabic-speaking listeners.

We conducted a prospective study of48 children, aged 2 to 14 years, who had persistent bilateralotitis media with effusion, enlarged adenoids, and a bilateral conductive hearing loss. Halfofthese patients underwent adenoidectomy and the other halfadenotonsillectomy. All patients were followed every 2 weeks for up to 6 months. At 2 months postoperatively, the overall success rate in terms of the resolution of middle ear effusion was 85.1 %. Success rates were 82.6% in the adenoidectomy group and 87.5 % in the adenotonsillectomy group; the difference was not statistically significant. Our findings demonstrate that both adenoidectomy and adenotonsillectonty are effective for the treatm ent of persistent otitis media with effusion, and they confirm the findings of other studi es. Based on ourfindings and those ofother investigators, we offer a four-step approach to the management of these children.