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表兄妹结婚生下女儿五脏长反,还患有终末期肺病需移植

2017-09-13 13:21:33   中国青年网

“人体肺部的纤毛好比一把‘刷子’,肺部细菌能够有效地被清除,靠的就是这把‘刷子’。”韩主任说,据报道,该综合征很罕见,发病率只有1/60000-1/20000,周女士之所以患病和她父母近亲结婚有关,她的父母是表兄妹。有研究显示,近亲结婚者,其子女Kartagener综合征的发病率高达20%-30%。

上周三,周女士幸运地等到了肺源,韩主任及其团队第一时间为她做了移植手术。

术中,韩主任发现周女士情况比预想的要困难。“数十年来,她的肺部由于反复感染,胸腔出现了严重的粘连,血管盘根错节,稍有不慎就可能下不了手术台了。”韩主任说,“另外,由于她五脏六腑反位,大大增加了手术难度。”

在ECMO(一种体外心肺循环系统)和麻醉团队的保障下,韩主任凭借多年的移植经验,仔细分离了周女士胸腔内的粘连,手术从下午4点一直做到第二天凌晨两点。

浙大一院肺移植中心成立于去年6月,是我省目前唯一具有肺移植专业资质的终末期肺病诊治中心,目前累计完成肺移植手术16例,今年至今已完成11例,年手术量位居全国前五。

 父母血缘越近,子女患病率越高

“研究表明, 近亲结婚,如表兄妹、堂兄妹、叔叔和侄女、舅舅和外甥女,其后代容易患常染色体隐性遗传病,且关系越近,患病率越高,Kartagener综合征就是其中一种。”浙大一院遗传与基因组医学专科门诊祁鸣教授说。

周女士还有4个兄弟姐妹,为何唯独她一人患上Kartagener综合征?“常染色体隐性遗传病的致病基因在常染色体上,基因性状是隐性的,只有纯合子时才显示病状。”祁教授说,“通俗地说,正常情况下,人体有两套基因,一套来自母亲,一套来自父亲,其子女所获得的基因有四种组合,只有父母双方都把致病的那套基因遗传给了下一代,其子女才会患病,这种概率为25%。”

“近亲中因相似的基因较多,某些隐性疾病的基因会得到累积,子代的患病几率便会大大增加。”祁教授说。

大量资料表明, 近亲结婚痴呆儿发生率比非近亲结婚高150倍,新生儿死亡率和畸形率也比非近亲结婚高3倍多,其子代患致盲性视网膜疾病、耳聋的几率也会大大增加,这也是为什么我国婚姻法规定, 三代以内血亲禁止结婚的原因。

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