［第22回前庭研究会］非対称性音響外傷とメニエール症候群
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The authors described five cases of Ménière's syndrome all of which had histories of assymmetric blast injuries of ears. These cases were picked up among our ten years series of dizzy patient.<BR>Case 1. M. M. 34 yrs. male. He had experienced a minor explosion in his laboratry during a chemical experiment. Deafness and tinnitus of the left ear and whirling vertigo had occurred which lasted about two hours. Three months later typical vertiginous attack appeared and same kind of attacks repeated six times during the following twelve months. Diagnosis: typical Ménière's disease.<BR>Case 2. T. Y. 35 yrs. male. He had exposed to the blast injury during the World War II at the age of twenty-three. Deafness and tinnitus of the left side occurred immediately after the trauma, but vertiginous attacks had first appeared two years later which was followed by a number of attacks during the next ten years. Diagnosis: typical Ménière's disease.<BR>Case 3. K. Y. 40 yrs. female. She had experienced an accidental explosion of a firework beside her and then suffered from left tinnitus and deafness. Dizziness appeared six months later which was not a turning nature but was a kind of unsteadness and it was not accompanied by nausea or vomiting. Diagnosis: atypical Ménière's syndrome.<BR>Case 4. S. A. 45 yrs. male. At the age of thirty he had had his left ear blowed with an air-compressor. Tinnitus and fullness of the left ear remained and falling tendency to the left appeared from time to time. Diagnosis: atypical Ménière's syndrome.<BR>Case 5. T. Y. 51 yrs. male. He had had a blast of gun in front of his right ear when he was twenty years of age. Slight loss of hearing had increased at the age of fifty and he had experienced slight dizzy attacks several times. Diagnosis: atypical Ménière's syndrome.<BR>According to the findings of these cases the authors considered that some kind of inner ear lesion which was produced by the blast injury, might be, at least in some part, a cause of Ménière's syndrome.<BR>Of cause further studies are necessary for the confirmation of the relationship between the blast injury of the ear and Ménière's syndrome.
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