AUDIOLOGY JAPAN
Online ISSN : 1883-7301
Print ISSN : 0303-8106
ISSN-L : 0303-8106
Volume 39 , Issue 2
Showing 1-16 articles out of 16 articles from the selected issue
  • [in Japanese]
    1996 Volume 39 Issue 2 Pages 99
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
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  • [in Japanese]
    1996 Volume 39 Issue 2 Pages 100
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    Download PDF (145K)
  • Hiroyuki Zusho
    1996 Volume 39 Issue 2 Pages 101-108
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    The changes in hearing after patients with noiseinduced deafness have left their jobs at noisy working places were studied and a follow-up study showed the following results.
    1) While persons were working at noisy places, their hearing under a noisy environment was deteriorated rapidly and relatively early, between 5 and 15 years, and thereafter it remained unchanged or deteriorated very slowly. This slow deterioration was almost consistent with physiological presbycusis. In the high frequency region, hearing deteriorated in those who were exposed to high pitch noise.
    2) According to the results of a follow-up of more than 10 year's duration after leaving from their jobs at noisy places, hearing was deteriorated in almost the same manner as in presbycusis at 250Hz to 2000Hz. At 4kHz and 8kHz, however, the deterioration was slow compared with presbycusis, probably because hearing was already deteriorated considerably at the time of leaving from their jobs.
    3) The results of a follow-up of more than 5 year's duration were almost the same as the results of the aforementioned 10 year's follow-up. In the low to middle frequencies, however, hearing was deteriorated markedly compared to presbycusis in some cases.
    On the basis of the results, pathophysiology of the inner ear was discussed in reference to noiseinduced deafness and presbycusis.
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  • Tsutomu Nakashima, Shigeji Fukuta, Noriyuki Yanagita
    1996 Volume 39 Issue 2 Pages 109-114
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    Although some investigators have reported a long-term outcome of sudden deafness, few described very long-term outcome in association with presbycusis. We investigated the long-term outcome after stabilization of hearing loss following sudden deafness using a questionnaire and re-examination of audiometry. In some patients, deterioration of hearing level was observed in the affected ear (sudden deafness ear) or in the non-affected ear (contralateral ear) during the long-term. The deterioration of hearing level in the affected ear was not associated with age. In contrast, the deterioration of hearing level in the non-affected ear was considered to represent presbycusis. In these cases with presbycusis, further deterioration of hearing level was not readily occurred in the affected ear.
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  • Tetsuo Morizono, Kimio Shiraishi, Atsushi Takesue, Yuji Suoya, Toshihi ...
    1996 Volume 39 Issue 2 Pages 115-121
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    The aim of this study is to investigate how aging affects the auditory acuity of patients who have received streptomycin injections as a therapy for pulmonary tuberculosis, and have lost some degree of hearing.
    A retrospective analysis of 159 cases showed only 31 cases, 18 male, and 13 female, to have reliable audiograms over the course of treatment. The selection criteria were audiograms before, and immediately after, completion of 3 to 6 months of streptomycin therapy, and audiograms 8 to 11 years after the completion of the injections.
    Contrary to our expectation, the effects of aging on streptomycin induced deafness were neither additive nor synergistic. Patients who showed a greater degree of hearing loss immediately after the drug injection appeared to have less of an aging effect, and vice versa, thus the overall outcome of their current hearing level were more or less the same in all the patients.
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  • Makito Okamoto
    1996 Volume 39 Issue 2 Pages 122-129
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    The purpose of this study was to investigate and predict the aging effect on the hearing level of patients with IBSH. The initial and final hearing levels of 110 patients with IBSH were obtained. The average observation period was 10 years. As a control, hearing test results were also obtained from 1377 adult subjects, who had neither the history of ear diseases nor noise exposure. Within the period of 10 years, the hearing level of the patients with IBSH deteriorated. The extent of deterioration did not vary depending on generations or test frequencies. The scattergram obtained from the result of the initial and final hearing levels suggested that the trigger of hearing deterioration in patients with IBSH was related to a certain hearing level rather than the aging factor. Based on the analysis of hearing distribution, it was assumed that the damaged area of the inner ear of patients with IBSH and with hearing impairment due to aging might be identical. Since these subjects share the same pathology, hearing deterioration due to aging might be concealed by hearing deterioration related to IBSH.
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  • Yukihiko Kanda, Naoki Tsukasaki, Hidetaka Kumagami, Fujinobu Tanaka, M ...
    1996 Volume 39 Issue 2 Pages 130-134
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    Up to now, ABR has made a great contribution to the early diagnosis of child' hearing loss. Hewever, ABR cannot detect low frequency hearing loss because of click tone as a stimulus. We were able to perform nonsurgical EcochG in children to evaluate low tone inner ear function, which ABR could not detect, by using a new electrode (HN-5) developed by Nishida et al. (1994).
    The subjects were 7 children (from 10 months to 2-years 6-months) whose ABR revealed poor or no response. They had relatively good response of CM at low frequencies even if ABR showed poor or no response. This would allow us to know whether or not the function of their inner hair cells has remained. Up until this time, there has never been a nonsurgical test to evaluate children's electro-physiologic phenomenon at low frequency. We expect that childrens' inner ear function can be evaluated by using thresholds of CM which have the character of frequency specificity in cochlea. Furthermore, we expect that the information contained in the CM from ECochG is useful for the fitting of hearing aids in children.
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  • Eiji Chida, Nobukiyo Satoh, Mitsugu Kawanami, Masaaki Kashiwamura, Toh ...
    1996 Volume 39 Issue 2 Pages 135-142
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    Transient evoked otoacoustic emissions (TEOAEs) were measured and evaluated in 625 human ears with ILO88 Otoacoustic Emission Analyzer to establish clinical criteria of TEOAE for separating normal-hearing from hearing-impaired ears. Firstly, TEOAE parameter (Total Echo Power or Whole Reproducibility) value was compared with pure tone thresholds. However, is was difficult to distinguish precisely between normal-hearing and hearing-impaired ears with TEOAE because many normal ears presented no or low responses of TEOAEs and some impaired ears showed high responses. Therefore, cumulative distributions of sensitivity (normal-hearing ears identified as normal hearing) and specificity (hearing-impaired ears identified as hearing impaired) were constructed and used to calculate the cut-off point of TEOAE parameters. Although the complete cut-off point could not be calculated because of the properties of TEOAE, it is considered that the actual values that correspond to both Total Echo Power≥5.5dB and Whole Reproducibility≥65%, or either Total Echo Power≥9.5dB or Whole Reproducibility≥82.5% can be useful for clinical evaluation of TEOAE.
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  • Tetsushi Sakashita, Takeshi Kubo, Makoto Kusuki, Keita Ueno, Kazushi K ...
    1996 Volume 39 Issue 2 Pages 143-150
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    Filtered echo power (FEP) of evoked otoacoustic emissions (EOAEs) and 2f1-f2 distortion-product levels (DPLs) of distortion-product otoacoustic emissions (DPOAEs) at 1, 2 and 4kHz were recorded from 78 ears with sensorineural hearing loss. The relationship between those two parameters and pure tone audiometric thresholds at the corresponding frequencies and in the higher frequency area was examined.
    The DPLs indicated higher incidences and correlations with hearing thresholds at the corresponding frequencies and wider dynamic ranges of the hearing thretholds for their detection than the FEP. The DPL and FEP incidences and the DPL values were influenced by hearing conditions in the higher frequency area. The DPL and FEP values and the DPL incidences in ears with sensorineural hearing loss but with normal hearing thresholds at the corresponding frequencies were lower than those in normal hearing ears at 1 or 2kHz.
    From these results, DPOAEs were considered to be more useful for studies on a relationship to hearing thresholds than EOAEs. Furtheremore, it was suggested that both EOAEs and DPOAEs were affected by the range and degree of injury in the basal part of cochlea, and that their mid-frequency components might be more sensitive against cochlear injury than the high-frequency ones.
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  • Hajime Sano, Yoshio Takeuchi, Makito Okamoto, Kazue Asano
    1996 Volume 39 Issue 2 Pages 151-157
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    We analyzed 3927 records of speech discrimination test obtained by computer-aided speech audiometer (CASA) in 1994. The difficulty and discriminating power of each monosyllable in the twenty CV syllables list were investigated.
    The distribution of discrimination scores of 3927 records showed a pattern characterized by exponential function curve with a peak population at 95%.
    The difficulty levels of syllables distributed rather uniformly between 30 to 90% of the discrimination scores. The discriminating power of syllables were generally greater than that of the previously reported results in 57-discrimination test.
    It was concluded that the capability of grading individuals on continuous scale in the articulation ability was greater in CASA than in 57-test which has been standardized in Japan.
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  • Kazumi Makishima, Masafumi Yoshida, Kazunobu Fujimura
    1996 Volume 39 Issue 2 Pages 158-163
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    A high frequency audiometer was newly designed and constructed, and was clinically applied to normal young persons and to patients with various types of sensorineural hearing loss. The evaluation of the new high frequency audiometric system and the reliability of these tested data were herein fully discussed.
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  • Shin Aso, Yukio Watanabe, Kanemasa Mizukoshi
    1996 Volume 39 Issue 2 Pages 164-170
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    Five cases with bilateral Meniere's disease and three cases with contralateral delayed endolymphatic hydrops (DEH) were presented. These five Meniere patients were selected as they showed an unusual fluctuation of hearing which was bilaterally alternating (see-saw like) hearing change. In three of the five patients, hearing in the secondarily affected ear finally became worse than that in the first ear. Difference of the pathophysiological phase between right and left endolymphatic hydrops was supposed to be a cause for this ‘see-saw like’ phenomenon. Two of the three DEH patients showed the same unusual fluctuation as those with Meniere's disease. It became difficult to evaluate the fluctuated hearing in the first affected ear as the hearing loss became much more profound. But hearing of their secondary ears had never become worse than that in the first affected ears. There was no convincing evidence to explain the cause of hearing loss in the opposite ear of contralateral-type DEH. But this report shows that there are some clinical similarities as well as differences between bilateral Meniere's disease and contralateral-type DEH.
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  • Akinori Itoh, Eiji Sakata, Kyoko Ohtsu
    1996 Volume 39 Issue 2 Pages 171-177
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    We studied 68 (27 males and 41 females) patients with unilateral Ménière's disease, who had been followed for one year or longer and had received pure-tone audiometric test four times or more. A total of 348 audiograms were examined. The average age of the patients at the initial examination was 44.8±11.2 (mean±SD) years, and the average age at onset was 40.0±11.4 years. As the duration of disease increased, the proportions of a low frequency hearing loss and a low and high frequency hearing loss decreased and those of a high frequency hearing loss and a flat patterned hearing loss increased. The average hearing level for seven frequencies was 40.3±14.9dB in the initial audiometric test and 45.7±17.6dB in the final test. The changes in hearing level were most remarkable in the low to middle frequency range. The changes in hearing level at 250, 500 and 1000Hz were the greatest. Among the patients with hearing improvement, 5 had improved from a low frequency hearing loss to normal hearing. Intratympanic dexamethasone injection and inner ear anesthesia were effective in suppressing vertigo, relieving tinnitus and improving a low tone deafness. These methods are useful local treatment for Ménière's disease.
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  • Hideaki Kusano, Takashi Tsuiki, Kazuo Murai, Kazuharu Yamazaki
    1996 Volume 39 Issue 2 Pages 178-183
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    The diagnostic criteria for mumps deafness were proposed by the Acute Profound Deafness Resarch Committee under the auspices of the Ministry of Health and Welfare in 1987. Sixty-eight patients at this department were re-examined audiometrically and otologically according to the criteria. The results are as follows.
    1) Of the 68 cases, 39 cases were classified as definite, 1 as subdefinite and 28 as reference.
    2) In mumps deafness most patients were children so it was almost impossible to take the history of mumps deafness especially in the asymptomatic patients. In the case of profound deafness, therefore, mumps IgM was helpful for making diagnosis.
    3) Hearing disturbance in 9 cases showed a rapidly progressive deterioration which led to total deafness from 1 to around 7 days after the initial audiometry. In all patients audiogram showed total deafness or only a residual hearing loss, and none responded to the treatment. In terms of the prognosis and mode of onset of hearing disturbance there were definite differences between sudden deafness and mumps deafness, which indicates a difference in pathophysiology between these two entities.
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  • Noriyuki Yanagita, Tsutomu Nakashima, Tetsuya Shitara, Yoshiyuki Ohno, ...
    1996 Volume 39 Issue 2 Pages 184-188
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    Epidemiological studies on acute profound deafness by sending questionaries to the hospitals which were randomly sampled throughout Japan, including university hospitals were done between January 1 and December 31, 1993. The reporting rate of the questionarier was 49.6%. In the first quesionare, the number of patients with deafness who received treatment in 1993 was estimated as follows; 1) sudden deafness in 24, 000 (95% CI 21, 000-27, 000) patients, 2) idiopathic bilateral sensorineural hearing loss in 700 (500-900), 3) mumps deafness in 400 (300-500), 4) perceptive deafness secondary due to the immuno-disorders in 200 (100-300).
    In the second quesionate, informations were obtained individually in order to elucidate the clinical manifestations of these disease. The results will be published in near future.
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  • T Morimitsu, Y Ushisako, K Torihara, M. Sadanaga
    1996 Volume 39 Issue 2 Pages 189-194
    Published: April 30, 1996
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    As the anionic angiographic contrast medium (76% Urografin®) showed excellent therapeutic effect on sudden deafness, the focus of the disease is speculated to be located at the endothelium in the stria vascularis. By electron microscopic study of the vascular endothelium with kationized poly-1-lysine gold colloid, anionic sites were observed on the luminal surface with sialic acid and basilar membrane with hyaluronic acid. By electrophysiological study of the stria vascularis, positive charge of 20mV in the basal cell, 50mV in the intermediate cell, 90mV in the margnal cell, and 100mV of EP were observed respectively. Therefore, it is concluded that the blood cochlear barrier is an ionic charge barrier between the endothelium and the strial cells.
    If the negative charge on the luminal surface of the endothelium is lost by unknown etiology, the barrier is broken down and EP decreases causing sudden deafness. In this condition the luminal surface is charged positive when the strial cells keep their active transport function. Thus, contrast medium bonds ionic on the luminal surface making pseudo-barrier, which acts as a promoter for recovey from the deafness. In conclusion, sudden deafness should be a barrier break deafness due to dysfunction of glycoprotein metabolism of the vascular endothelium in the stria vascularis.
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