著者

角田 保雄 尾股 丈夫 大谷 巌

出版者

耳鼻咽喉科臨床学会

雑誌

耳鼻咽喉科臨床 補冊 (ISSN:09121870)

巻号頁・発行日

vol.1995, no.Supplement83, pp.53-67, 1995-08-01 (Released:2012-11-27)

参考文献数

41

被引用文献数

1

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Correlations were made between audiometric pattern (especially flat and gradual high tone loss)and speech discrimination score (SDS) in 255 ears with sensorineural hearing loss that were tested at the Department of Otolaryngology of Shirakawa Kousei General Hospital during the past 6 years.First, the audiometric pattern was defined on all frequencies (0.125 k-8 kHz). SDS of each audiometric pattern resembled that in all similarly affected ears, but in younger ears (under 75 years old, the average value of pure tone hearing level subtracted from speech reception threshold was under 10 dB), SDS of patients with flat audiogram or abrupt high tone loss (mainly 8 kHz) maintained a good score (over 70%) at 10 dB intervals below 70 dB, then sharply decreased at 70 dB. However, SDS of patients with gradual high tone loss decreased in proportion to hearing loss. This fact supports Schuknecht's classification of hearing loss in presbycusis. Furthermore, this suggests that there is a boundary of good SDS at the 60 dB level, at which SDS was marked by deafness and a flat audiometric pattern caused by atrophy of the stria vascularis.Second, the audiometric pattern was defined by the slope of the audiogram (value of 2 kHz loss subtracted from 0.5 kHz loss, and 4 kHz loss from 0.5 kHz loss). The gradual high tone loss group had a good SDS (over 70%) under 50 dB. In cases involving hearing loss reaching and exceeding 50 dB, SDS declined abruptly. Good SDS almost disappeared and poor SDS (under 50%) increased suddenly. This suggests that not only that the decrease in neurons reached the minimum necessary to maintain a good SDS, but also that the neurons which transfer information under 50 dB exerted great influence on SDS.Differences were analyzed, between each audiometric pattern and between the group before abrupt deccrease in SDS and the group after the abrupt decrease in the flat audiogram or gradual high tone loss group.

著者

石川 浩男 尾股 丈夫

出版者

耳鼻咽喉科臨床学会

雑誌

耳鼻咽喉科臨床 (ISSN:00326313)

巻号頁・発行日

vol.91, no.9, pp.899-904, 1998-09-01 (Released:2011-11-04)

参考文献数

17

被引用文献数

2 5

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Between November 1985 and June 1997, 83 cases of foreign bodies in the external auditory canal were treated in our department. They represented 0.352% of the total number of outpatients during the same period. Forty-six of the cases were children under 10 years of age, which accounted for 55.4% of all cases. In total, there were 49 male patients and 34 female patients, including 46 right side cases, 36 left side cases and only one case affected on both sides. Biotic foreign bodies were seen in 20 cases mostly adults, with peak occurrence in July and August. Among nonbiotic foreign bodies, mineral foreign bodies were most numerous, and in 19 cases toy-globes were removed. In 50 of the cases mostly children foreign bodies had been inserted during play. A total of 27 cases were asymptomatic. At the time of removal, intravenous anesthesia with ketamine hydrochloride was very effective in keeping patients, especially children, quiet and still.