缺碘地区补碘前后出生儿童的听力比较分析

用丹麦AS 72型纯音诊断测听器 ,对广东省碘缺乏病重病区—龙川县上坪镇在供碘前 (1984年 ) 11～ 14岁学生进行听力测定 ,并选择非缺碘区—广东省龙川县附城镇学生做对照 ;1984年底病区开始供应5 0mg kg碘盐 ,于供碘盐 15年后 (1999年 ) ,对供碘 1年后出生的 (现年 11～ 14岁 )儿童进行听力测定。结果表明供碘前 ,缺碘地区学生平均听阈显著高于非缺碘地区 ,表现为双侧低频感觉神经性听力下降 ;缺碘区补碘一年后出生的儿童听力与非缺碘区比较差异无显著性。妊娠期缺碘可使儿童听觉系统发育受到损害 ;缺碘区妇女在妊娠前及妊娠期补碘能使儿童听觉系统发育正常 ;食用 5 0mg kg碘盐已能满足妇女妊娠对碘元素的需要。

Comparative analysis on the hearing ability of children in iodine deficiency areas born before and after iodine supplementation

According to the detection of hearings ability of children in iodine deficiency areas who was born before and after iodine supplement ,the effects of iodine supplement on hearing system development was evaluated.Method: Hearing was tested by AS 72 type pure zone diagnostic audiometer( made in Denmark).Hearing of 11-14 years old students were tested before iodine supplement in iodine deficiency areas in 1984, the control was students living in non iodine deficiency areas. Iodine salt (50mg/kg) were supplied by the end of 1984,the hearings of children born after one year of iodine supplied were tested in 1999.The result showed that the average hearing threshold of students before iodine supplied in iodine deficiency areas was significance higher than of non iodine deficiency areas. The hearing of children born after one year of iodine salt supplied in deficient areas had no significant difference from that of normal areas.The development of hearing system might be deteriorated by iodine deficiency during pregnant. It was able to meet the need of iodine that pregnant women ate 1:20 thousands iodine salt.