ThecircumeferentialmappingcatheterinFigure1.56isinapulmonaryvein.TheLAOprojectionclearlyshowsthattheveinisaleft-sidedpulmonaryvein.Thecircumferentialmappingcatheterislikelylocatedatwhichsite?
Leftupperpulmonaryvein
Leftlowerpulmonaryvein
Theleftatriumnotengagingthepulmonaryvein
Cannotbedetermined
Answer-Cannotbedetermined.
图1.56中白箭头所示环状标测导管位于某一根肺静脉内。LAO影像清楚显示该肺静脉为左侧肺静脉。问题:环状标测导管可能位于哪个部位?
A.左上肺静脉
B.左下肺静脉
C.左房内,并未插入肺静脉
D.不能确定
答案:D——不能确定。
Attimes,theupperandlowerleft-sidedveinsarisefairlyclosetoeachother.ThefactthatintheRAOprojectionthecatheterislocatedfairlyposterior