runcusarteriosus共同动脉干

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1、TruncusArteriosus共同动脉干clickimagetoenlargeWhatistruncusarteriosus?什么是共同动脉干？Truncusarteriosusisacongenital(presentatbirth)defectthatoccursduetoabnormaldevelopmentofthefetalheartduringthefirst8weeksofpregnancy.Theheartbeginsasahollowtube,andthechambers,valves,andgreatarteriesdevelopthroughoutthefir

2、st8weeksofpregnancy.Theaortaandpulmonaryarterystartasasinglebloodvessel,whicheventuallydividesandbecomestwoseparatearteries.Truncusarteriosusoccurswhenthesinglegreatvesselfailstoseparatecompletely,leavingaconnectionbetweentheaortaandpulmonaryartery.共同动脉干是一种先天性心脏病(出生时即有的)是由于在妊娠的头8周里胎儿心脏发育异常造成的。心脏

3、开始是一个中空管，并且心腔、瓣膜、和大血管的发育贯穿这妊娠的头8周。主动脉和肺动脉在开始时是一个血管，以后分隔成两个动脉。当这个大血管没有完全分开时，在主动脉和肺动脉之间留下连接处。Truncusarteriosisisacomplexdefectwherethereisasingle(normallytherearetwoseparatearteries)vesselarisingfromtheheartthatformstheaortaandpulmonaryartery.Anothercongenitalheartdefectthatoccurswithtruncusarteri

4、osusisaventricularseptaldefect(ventricularseptum,ordividingwallbetweenthetwolowerchambersoftheheartknownastherightandleftventricles).共同动脉干是一种复杂的缺陷，一个单一的血管从心脏发出，（正常时是两个互相分开的动脉）。与共同动脉干相伴的另外的心脏缺损是心室间隔缺损。clickimagetoenlargeNormally,therearetwoseparatearteries(theaortaandthepulmonaryartery.Oxygen-poo

5、r(blue)bloodreturnstotherightatriumfromthebody,travelstotherightventricle,thenispumpedthroughthepulmonaryarteryintothelungswhereitreceivesoxygen.Oxygen-rich(red)bloodreturnstotheleftatriumfromthelungs,passesintotheleftventricle,andthenispumpedthroughtheaortaouttothebody.正常时，这儿是两个互相分开的动脉（主动脉和肺动脉。

6、静脉血（兰）从全身回到右心房，进入右心室，然后泵出经肺动脉进入肺，在这里吸收氧。动脉血（红）从肺里回到左心房，进入左心室，然后泵出经主动脉到达全身）。Intruncusarteriosus,oxygen-poor(blue)andoxygen-rich(red)bloodmixbackandforththroughtheventricularseptaldefect.Thismixedbloodthenflowsthroughthecommontruncalvessel.Someofitwillflowthroughthebranchthatbecomesthepulmonaryart

7、eryandontothelungs,andsomeofthemixedbloodwillgointotheaorticbranchandcontinuetothebody.Themixedbloodthatgoestothebodydoesnothaveasmuchoxygenasnormal,andwillcausevaryingdegreesofcyanosis(bluecoloroftheskin,lips,andnailbeds).在