AUDIOLOGY JAPAN
Online ISSN : 1883-7301
Print ISSN : 0303-8106
ISSN-L : 0303-8106
Volume 37 , Issue 2
Showing 1-15 articles out of 15 articles from the selected issue
  • Miyuki Ishikawa, Hideya Oi, Shinsuke Ueda, Shin Aso, Yukio Watanabe
    1994 Volume 37 Issue 2 Pages 87-91
    Published: April 30, 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    In this article, electrocochleography (ECochG) and other neuro-otological tests were performed on 35 patients with acute-low-tone sensorineural hearing loss (ALHL).
    Those 35 patients were divided into 2 groups: 11 patients with fluctuating hearing and 24 without fluctuation in hearing after the onset.
    A complete recovery was found in only 3 of the 11 patients with fluctuating hearing while in 18 out of the 24 without fluctuating hefring. ECochG was performed in 24 of the 35 patients. In 8 of 11 patients with fluctuating hearing, an increased negative summating potential (SP) in ECochG was recorded. On the other hand, only 3 of 13 patients without hearing-fluctuation showed an increased negative SP. ECochG can be a good indicator for the diagnosis of ELH and for predicting the course whether the hearing would be fluctuating or not. But there were no definite findings regarding to an etiology of ALHL in patients without fluctuating hearing. ECochG to low-frequency tone bursts should be recorded for this purpose.
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  • Hideo Edamatsu, Sigeyuki Sakamoto, Koichi Yamashita
    1994 Volume 37 Issue 2 Pages 92-97
    Published: April 30, 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    We have experienced 112 cases of sensorineural hearing loss in low frequencies between 1982 and 1993. The hearing loss, limitted in frequencies lower than 1kHz, abruptly occurs without vertigo and recurrence of attack is very rare. The etiology of the disease has been unknown, but prognosis of hearing loss seems to be better than that of other sensorineural diseases. This study was performed to explore whether hearing level at initial visit might effect recovery of hearing or not.
    112 cases were classified into three groups depending extent of hearing impairment at their initial visit. The first group (I) consisted of 27 ears with slight hearing loss which sum of thresholds of low three frequencies (125, 250 and 500Hz) was less than 60dB. The second one (II) was 82 ears with medium hearing loss between 60 and 120dB, and the third (III) was 14 ears with severe one above 120dB. No difference of distribution in age and sex was seen among three groups. Three groups showed good recovery of hearing loss, and hearing level after more than three months of observation were 40.2±20.1dB in group I, 50.0±28.3dB in II and 41.7±35.1dB in III. No statisitical change was found in the final hearing levels of three groups.
    Therefore, good recovery of hearing loss can be expected even if hearing loss at the initial visit might be slight or severe.
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  • Tatsuya Hasegawa, Tsunemasa Sato, Naohisa Iizuka, Katsuhiro Shimoda, S ...
    1994 Volume 37 Issue 2 Pages 98-104
    Published: April 30, 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    We studied 168 patients with acute low tone sensorineural hearing loss. The examinations included (1) hearing of pure tone (2) discrimination score (3) inner ear function at 500Hz (Fowler test, SISI test, Békésy Audiometry) (4) directional hearing test (5) tinnitus (pitch match, loudness balance) test.
    The results were as follows:
    1) 93% of these patients had normal discrimination score regardless of hearing level of low tone.
    2) The detection rates of recruitment phenomenon was the highest at Fowler test in unilateral low tone sensorineural hearing loss.
    3) The positive rate of recruitment phenomenon at Fowler test, SISI test, and Békésy audiometry in a low tone (500Hz), showed no relationship of dependent phenomenon. Only SISI test showed a significant relationship between the hearing level and the positive rate.
    4) Directional hearing test was the most reliable in case with less than 30dB HL of hearing, and with less than 15dB in binaural threshold difference.
    5) The patients with low tone sensorineural hearing loss did not always complain of tinnitus in the pitch of hearing loss.
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  • Hajime Sano, Tetsuya Shitara, Makito Okamoto, Masatoshi Hirayama
    1994 Volume 37 Issue 2 Pages 105-111
    Published: April 30, 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    The clinical course and therapeutic effect in 143 cases with low-tone sensorineural hearing loss (LTSH) were investigated. The treatment modaling was selected from regimens including Isosorbide or metabolic activator and vitamine B with/without steroid or vasopressor drugs based on the clinical course and findings. The results were as follows:
    1) LTSH could be devided into two types; recurrent type and single-attack type. Sixteen cases of 52 who were classified as recurrent type were diagnosed as Meniere's disease later.
    2) Since spontaneous recovery was often obtained in the single-attack type, the effect of the treatment was difficult to be evaluated.
    3) In the recurrent type except typical Meniere's disease, the effect of treatment was variable, and Isosorbide, steroid and vasopressor were effective in selected cases.
    As the pathogenesis of LTSH, several possibilities such as endolymphatic hydrops, circulatory disturbance, autoimmuno disease etc, could be considered.
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  • Takashi Fukaya, Yhuko Hata
    1994 Volume 37 Issue 2 Pages 112-115
    Published: April 30, 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    Records of 216 cases with sudden low-tone sensorineural hearing loss at Mitsui Memorial Hospital, from 1987 through 1991 were investigated regarding initial symptoms, prognosis and final diagnosis. All subjects have been followed up for at least one year. Of these patients, 94 were males and 122 were females. The average age was 41.4 years, ranging from 12 to 73 years. As the initial symptoms, more than 60% of patients had both roaring tinnitus and ear fullness, but only 30% of them notices hearing loss. Eighty patients out of 216 (37%) had no recurrence, while 136 (63%) had recurrent attacks and their auditory findings revealed either fluctuation or deterioration. After follow-up, 41% of patients were diagnosed as Meniere's disease, 21.8% as sudden deafness and 14.4% as perilymphatic fistula.
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  • Chiori Kaminaga, Kazuhiro Ishikawa, Takashi Ishida, Ken Kitamura
    1994 Volume 37 Issue 2 Pages 116-120
    Published: April 30, 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    We studied the clinical characteristics of patients with acute low tone sensorineural hearing loss at Jichi Medical School between the years 1987 and 1993. In 36 subjects whose sum of the hearing level of the three high frequencies was below 60dB, the average age was 38 years old and 20 subjects werefemale. Thirty subjects demonstrated no recurrence with good recovery of the hearing level. The other 6 subjects suffered from the second episode of acute low tone hearing loss when their hearing loss was worse than that of the first episode and their hearing level did not reach to the recovered level of the first episode.
    In 16 subjects whose sum of the hearing level of the three high frequencies was over 61dB, the average age was 52 years old and 9 subjects were male. Five subjects demonstrated second episode of acute low tone sensorineural hearing loss. Thus, the present study suggests a different clinical characteristics between the subjects with below 60dB and 61dB of sum of the three high frequencies.
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  • Yasuhiro Inoue, Jin Kanzaki, Toshiaki O-Uchi, Shigemitu Yoshihara, Yas ...
    1994 Volume 37 Issue 2 Pages 121-125
    Published: April 30, 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    In order to investigate the pathophysiology of hearing impairment in so-called low-tone sensorineural hearing loss (LSNHL), we conducted the pure-tone audiometry and evoked otoacoustic emission (EOAE) measurements before and after glycerol-loading in 12 ears with LSNHL and the results were compared with those in 20 ears of cochlear deafness of unknown cause and 22 ears of Meniere's disease.
    The EOAE was elicited by the non-linear clicks of 82±1dBSPL which were produced from the Otodynamic Analyzer ILO88D (Version 3.51) and 4 parameters obtained from FFT analysis of EOAE waves were analyzed. Those parameters were total echo power (TEP), reproducibility (Repro), highest peak power (HPP) and frequency area peak power (FAPP), respectively.
    The significant increase in one or more parameters of TEP, Repro and HPP was found after the glycerol-loading in 7 out of 12 ears (58.3%) of LSNHL although the significant hearing improvement was found in only 3 ears (25.0%).
    The results obtained in this present study suggested that there could be the possibility of the reversible impairment of cochlear micromechanics in more than a half of the ears of LSNHL although the pathophysiology of hearing impairment in these ears could not necessarily be concluded as the endolymphatic hydrops.
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  • Taku Hattori, Niang Dan Qiu, Masayuki Sawaki, Hiromi Ueda, Noriyuki Ya ...
    1994 Volume 37 Issue 2 Pages 126-131
    Published: April 30, 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    Though acute low tone sensorineural hearing loss (ALTHL) was once included in sudden deafness (SD), currently it is regarded as a different syndrome or a disease from it's clinical features. Pathogenesis of ALTHL is now supposed to be multiple and complex just like in the case of SD. On the other hand, evoked otoacoustic emission (EOAE) has been expected as an objective test of cochlear function assessment. To explore both the pathology of ALTHL and the precise origin of EOAEs, five cases were evaluated by means of pure tone audiometry and EOAEs. In spite of the full or near-full recovery of hearing level in all cases, the minimum detectable level of each components (fast and slow) of EOAEs showed no remarkable change through the recovery period. Cochlea partitions which are responsible for ALTHL revealed a slight difference from the generator of EOAEs.
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  • Yasuko Nakano, Yasue Uchida, Tsutomu Nakashima, Noriyuki Yanagita
    1994 Volume 37 Issue 2 Pages 132-135
    Published: April 30, 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    We investigated 233 patients with acute onset of low-tone sensorineural hearing loss with unknown origin between 1974 and 1992. They were divided according to their audiograms into mild and severe types. In the mild type, there were 14 males and 39 females and the average age was 30.8 years. In the severe type, there were 94 males and 86 females and the average age was 35.7 years. The fact that young females predominated in the mild type, suggested etiological difference between mild and severe types of low-tone sensorineural hearing loss.
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  • Toshifumi Sakata, Akihide Imamura, Nobuhide Imamura, Yuji Suoya, Kimio ...
    1994 Volume 37 Issue 2 Pages 136-141
    Published: April 30, 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    It has been known that the latency of compound action potential (CAP) from the ear with experimental endolymphatic hydrops differed from that of the normal ear when two stimulus phase, rarefaction (R) and condensation (C), were used. Based on the above finding, ABRs using two kinds of click stimulus of R and C were recorded from edght patients with low frequency sensorineural hearing loss, who were suspected as having endolymphatic hydrops.
    We found that the difference between the wave I latencies of ABRs by R and C stimulus tones tended to decrease in the low frequency sensorineural hearing loss compared with normal cases, but the difference was not significant. The result may suggest that the ABR testing with this method is not accurate enough to make an objective diagnosis of endolymphatic hydrops in the low frequency sensorineural hearing loss.
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  • Masatoshi Hirayama, Tetsuya Shitara, Makito Okamoto, Hajime Sano
    1994 Volume 37 Issue 2 Pages 142-149
    Published: April 30, 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    The clinical course of acute low-tone sensorineural hearing loss (ALHL) was investigated in 59 cases for more than 1 year. The 59 cases were devided into 3 groups; Group A, in which complete recovery of hearing loss was obtained, Group B, un-complete recovery of hearing loss and Group C, diagnosed as Meniere's disease later. The results were as follows:
    1) The mean age at onset of hearing loss in Group B was higher than in the other groups.
    2) The average hearing threshold at the onset in Group B and Group C was higher than Group A.
    3) At 1000H, the two peaks of hearing distribution were noted at 20dB and 40dB in the three Groups.
    4) In these cases who showed recurrence of hearing loss, audiogram seldom showed downward slope type or horizontal type.
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  • Masafumi Nakayama, Yatsuji Ito, Hideyuki Takeuchi, Shigeo Sawai, Hirom ...
    1994 Volume 37 Issue 2 Pages 150-154
    Published: April 30, 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    We studied the initial symptoms, dizziness and prognosis in the patients with low tone sensorineural hearing loss in our department between 1988 and 1992. The subjects were 41 cases, 18 males and 23 females, and the average age was 40.1.
    There were 27 monoattack type (66%) and 14 recurrent type (34%). In 27 cases examined within one month after onset, the rate of recovery or improvement was very high [26/27 (96%)].
    There were 7 cases which accompanied dizziness, including 4 monoattack recovery type, 1 recurrent recovery type, 1 recurrent improved type, and 1 recurrent progressive type, which shifted to Meniere's disease. This indicated no connection between dizziness and the prognosis of hearing loss.
    There were some patients, who had shown a canal paresis in caloric test in the early stage, became normal response as their hearing was improved. It suggested that the disease might have accompanied with a transient vestibular disorder.
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  • Mitsugu Kawanami, Nobukiyo Satoh, Eiji Chida, Akiharu Yorita, Masaaki ...
    1994 Volume 37 Issue 2 Pages 155-161
    Published: April 30, 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    The evoked otoacoustic emissions (EOAEs) elicited by 1500Hz tonebursts were investigated in 38 patients with acute low-tone sensorineural hearing loss (ALHL) on their first visits to our hospital.
    The results obtained were as follows:
    1. A good positive correlation was found between EOAE detectable threshold and pure-tone hearing level at the average of 1000 and 2000Hz, but a poor correlation was found at the average of three low tone frequencies (125, 250 and 500Hz).
    2. Three were much better correlation between EOAE pseudothreshold and pure-tone hearing level in subjects who didn't visit the hospital within 2 weeks from the onset than in them who visited within 2 weeks. In other words, the function of cochlear micromechanics might continue to fluctuate in subjects who received EOAE examinations within 2 weeks.
    Based upon these results, we concluded that the damaged cochlear portion existed nearly in partition appropriate to low frequencies including 125, 250 and 500Hz, and that the cochlear dysfunction within 2 weeks from the onset seemed to be reversible.
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  • Tsuneo Inoue, Yasuo Tanaka, Kiwamu Satake, Yoshie Inoue, Hirofumi Niki
    1994 Volume 37 Issue 2 Pages 162-166
    Published: April 30, 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
    In order to elucidate pathosis of acute sensorineural deafness and low tone hearing loss, so-called low tone sudden deafness, evoked otoacoustic emissions (EOAEs) were examined. There was a significant correlation between mean pure tone audiometric thresholds and EOAE detection thresholds in 46 ears of sudden deafness in which 1kHz hearing thresholds were lower than 55dB. Scatter-plot of 24 ears with low tone hearing loss distributed roughly along the regression line obtained from the plot of sudden deafness. Mean detection threshold of EOAEs in ears with low tone hearing loss was 12dB lower than that in sudden deafness, in comparison with those ears with hearing threshold below 30dB at 1kHz. In addition to our previous findings of low and high tone hearing loss ears, the difference was understood by the traveling wave theory of the basilar membrane vibration. The pathosis of low tone sudden deafness is similar to that of moderate or middle grade sudden deafness, in respect to a disorder of the intracochlear micromechanics.
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  • 1994 Volume 37 Issue 2 Pages e1
    Published: 1994
    Released: April 30, 2010
    JOURNALS FREE ACCESS
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