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接受放射检查后并非都要终止妊娠

2017-08-16 05:57:21   中国青年网

长沙晚报通讯员 王蔓

【问】我半个月前做体检,接受了放射检查。但是不久后我发现自己怀孕了,想知道放射检查后是不是一定要终止妊娠。 ——市民王女士

【答】湖南省第二人民医院放射科副主任医师张伟

X线是一种波长很短、穿透能力很强的电磁波,如果被X线照射过多,就可能产生放射反应,甚至受到一定程度的放射损害。准妈妈接受放射检查后并非都要终止妊娠,需综合判断。

首先看接受X线辐射的时间。X光辐射线的确较易造成胚胎残废、胎儿畸形、脑部发育不良以及儿童期的癌症几率增加。孕儿的脑组织受X线辐射更敏感的时期为8~15周,妊娠3个月以后,胎儿的大多数器官已经基本形成,对胎儿的危害小了一些。另外,备孕妈妈月经前处于排卵阶段,射线可能对卵细胞或者受精卵有一定影响。

其次看接受剂量。辐射损害存在一定的剂量效应,胎儿所承受的头部的最大剂量是0.04毫希,胸部为0.0007毫希,腹部为0.245毫希,常规辐射防护的方式就是减少照射面积。

第三看照射部位。照射在胸部、手脚等远离胎儿的部位比腹部、骨盆等离胎儿近的部位好些。

准妈妈因为接受辐射后感到紧张或出现不适,建议去医院做一个针对胎儿健康情况的咨询和检查,以确定是否需要终止妊娠。

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