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Volume 23, Issue 5Supplement3
Displaying 1-6 of 6 articles from this issue
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Isamu EBIHARA1977 Volume 23 Issue 5Supplement3 Pages 707-721
Published: 1977
Released on J-STAGE: May 10, 2013
JOURNAL FREE ACCESSIn order to clarify central auditory functions of brain stem clinically, the author has continued to observe patients with perceptive hearing loss suffering from repetitive fits of hearing threshold shift and also being apt at conservative treatment through psychoacoustical hearing examinations.
Some applicative methods of noise masking of short tone were newly developed and used for hearing test to achieve this aim. That is to say, they are consisted of cerebral hemispherical dominancy test (EHHM-method), masking level difference test (MLD-test), measurements of critical bandwidth in monaurally and binaurally hearing (ECB-test) and tone decay after exposure to test tone at a audiometric level of 85 dB (ASA-1951) through about 30 seconds (loaded TD-test) etc.
As the results of this investigation, the followings were obtained:
1. It is found that eleven ears with repetitive fits of hearing threshold shift have had some symptoms like as transient ischemic attacks (TIAs) in present history and otologically often suffered from tinnitus, stuffy feelings, dizziness, giddiness and vertigo.
2. It will be clear that clinical features of hearing threshold shift are characterized as transient fit of hard of hearing within 50 dB with complete recovery lasting no longer than one week and also with irregular repetition of same type of audiogram and usually accompanied with auditory findings of brain stem disorders.
3. In prognosis, one-third of patients progress within 5 years or less to cerebral infarction or cardial attacks, and two-third advanced to progressive sensory-neural hearing loss.
4. Comparing hearing examinations to clinical course of hard of hearing, it can be clear that the findings of hearing test for sound localization, i. e. MLD-test and ECB-test, are highly important to aim at differential diagnosis of auditory lesions of brain stem level, because pathological findings have remained ever after complete recovery of hearing. But, it will be also found that loaded TD-test coincides with a course of threshold shift on audiograms.
5. From findings mentioned above, it can be easily guessed that there is a cue both to clarify a cause of perceptive hearing loss of obscure origin and also to detect big cerebrovascular or cardial seizures.View full abstractDownload PDF (1967K) -
Michinari OKAMOTO, Yoshiyuki TANI, Kazuyuki HORIUCHI, Shizuo FUJIMORI1977 Volume 23 Issue 5Supplement3 Pages 722-725
Published: 1977
Released on J-STAGE: May 10, 2013
JOURNAL FREE ACCESSA case who was 49-years-old man suffering from a fluctnating hearing loss in his left ear after conscious disorder was reported. The positive recruitment phenomenon was showed in high frequencies. The hearing fluctuation was showed between 20 and 50 dB with almost complete recovery in each attack in low and middle frequencies. Speech discrimination test and 2 click sound test revealed low score. No dizziness and versigo was complained. The treatment with steroid hormone was effective to each attack. The fluctuating hearing loss was generaly caused by disturbance of inner ear. But in this case, it was caused by retrolabyrinthal disturbance.View full abstractDownload PDF (402K) -
Shozo KAWAMURA, Masashi WADA, Toshiko ABE1977 Volume 23 Issue 5Supplement3 Pages 726-730
Published: 1977
Released on J-STAGE: May 10, 2013
JOURNAL FREE ACCESSThe threshold shift due to the neck torsion in normal adults and in cases of vertebro-basilar artery insufficiency was discussed.
In normal adults, the change of the auditory threshold was within 6 dB.
In cases of vertebro-basilar artery insufficiency, the changes of the auditory threshold above 6 dB were recognized in about 80% of cases.View full abstractDownload PDF (2767K) -
Makoto ODA, Tetsuya SHITARA1977 Volume 23 Issue 5Supplement3 Pages 731-734
Published: 1977
Released on J-STAGE: May 10, 2013
JOURNAL FREE ACCESSSeventeen cases with the fluctuating sensorineural hearing loss were reported. In these cases five were bilateral and twelve were unilateral fluctuating hearing loss. In comparison with the cases suffering I from the bilateral progressive sensorineural hearing loss which found in relatively young patient, the fluctuating sensorineural hearing loss seemed to be found in the middle age or aged persons. Type of the audiogram were almost flat or gradually high tone loss in the cases with bilateral fluctuating hearing loss, seven out of twelve cases with unilateral hearing loss showed the audiograms with decreased low tones. Finally some pathogenesis in this type of hearing loss were discussed.View full abstractDownload PDF (519K) -
Kazushige NII, Takashi TSUIKI1977 Volume 23 Issue 5Supplement3 Pages 735-737
Published: 1977
Released on J-STAGE: May 10, 2013
JOURNAL FREE ACCESSA case of recurrent hearing loss was reported. The hearing loss fluctuated with no relation to treatment. The patient is a 27 year-old male, a marchant, who had been received a treatment under the diagnosis of Meniere's disease at first and was doing well. But four years later, he realized loss of hearing and tinnitus in the both ears and dizziness. Every possible treatment of sensorineural hearing loss was tried, but all was uneffective. His hearing loss lingered with no relation to treatment. Such case is not uncommon and several causes of hearing loss were presumed, but none of these can be made definitely. It is the only etiological finding in our case that serologic tests of syphilis were possitive.View full abstractDownload PDF (3201K) -
Toyoji SODA, Shigeaki SHIRABE, Sanetomi EGUCHI, Yuri KOHRIYAMA, Akimic ...1977 Volume 23 Issue 5Supplement3 Pages 738-747
Published: 1977
Released on J-STAGE: May 10, 2013
JOURNAL FREE ACCESSIt is well known that the results of repeated measurements of auditory threshold on normal hearing subjects do not show exactly the same values. The purpose of this study is to clarify variability of the auditory function and its change with age, and to discuss the aging of the auditory function from the physiological point of view.
Auditory threshold measurements at 0.25, 0.5, 1, 2, 4, 8KHz were conducted by the method of limits at 2 or 3 day intervals by the same examiner with the same audiometer in the same sound-proof room. The intra-subject distribution of the auditory threshold obtained in repeated measurements carried out 20 times on 5 persons (10 ears) in the twenties, showed a normal distribution in each subject and at each test frequency. The auditory threshold obtained from the results measured 5 times on 100 persons (200 ears) between the age of seven and seventy three showed the well corresponded results with that from previous studies.
The intra-subject standard deviation obtained as an index to auditory variability in each age group was large in children and in the forty age group, 4.49 dB and 3.95 dB respectively, and small in twenties and over sixties, 2.93 dB and 3.15 dB respectively.
Our bio-informative analysis of the results led us to conclude that auditory function is physiological variable and this variability indicates stability of the functional condition. Furthermore, the transition of auditory function in aging is identical with that found in previous reports as far as the auditory threshold is concerned. However, auditory variability which shows an unstable threshold in children becomes stable in twenties and over sixties, and it is large in the forties seemingly due to aging of auditory function.View full abstractDownload PDF (1283K)
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