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This paper presents the results of a survey for the causes of sensori-neural hearing impairment in korea. The subjects were 1,676 children of total 2,928 en-rolled in 16 deaf schools : two schools in each area of Seoul, Busan, Gyeoung-bug. Gyoungnam, Gyeounggi and each one in Chungnam, Chungbue, Jhunnam and Jeju. The filling in the check lists were performed by their class teachers, interviewer, for 18 months from September, 1975 to February, 1976. The questionable or missed problems were reaffirmed The results obtained were as follows. Most of the reason’s 78.5% -were acquired characters that could be developed during pregnant period, the time of delivery and the time of after birth. The pure hereditary reasons except the cases complexed with one or two were only 11.3%. Those who could not ’be defined with any reasons were 10.2%. Among the acquired causes, 5.8% of total subjects were developed for pregnancy : 3.3%, during delivery : and 69.7%, after birth In the pregnant period, the drug intoxications were 2.4% of total subjects, several diseases such as influenja, bleeding, surgical operation venereal dis-eases and rubella etc. were about one percent, and the accompanied with some symptoms of pregnancy intoxication and traumatic events were 2.4%. During time, the cases with delayed rhythmica pain were 16 persons, the immaturities were 11, the asphyxial cases were nine, the errors of forceps delivery were seven, the cases of low body weight inspite of full term were four, the cases with cesarian section were three, the head injuries were two, and the accompanied with three kinds of above reasons were three. During after birth, the cases with acute communicable diseases were 35 4% of total subjects, the fever unknown origin were 16.1%, the chronic oti s media were 3.7%, the meningitis were 3.5% the gastric and nutritonal diseases were 3.5% the drug intoxications were 4.8%, the blood diseases were 0.3% and the other causes were 2.2%. Here by acute communicable diseases, Some importants were measle, 10.1% of total subjects : meningitis 7.3% : convulsion with some reasons 4.9% : poliomyelitis. 3.2% : encephalitis, 2.4% : and mumps, rubella, pertusis, scarlet fever, and small pox were Some what played a role in. Among 59 cases with brain diseases, 53 were concussion by the accidents, such as traffic and falling or sliping down etc., the cerebral paralysis and hydrocephalus were two, respectively. And the blood diseases were severe new jaundice in all five cases. If we were summarized with the above mentioned, most of the hearing impairments were introduced by the combined reasons with familial or hereditary factors and the acquired, than by a simple disease. Among the congenital or hereditary hearing impairments classified to now a day, we suppose that the many cases with the acquired causes during pregnancy, deivery and after birth were complexed. Subsequently, the maternal and child health should be more arid more developed in our contry, also.
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