All veins except the pulmonary vein carry unaerated blood. 除了肺静脉以外,所有静脉输送的都是二氧化碳血。
In cardiac operation,it is used for attracting the blood in left atrium through atrial septal or upper lung vein,inserting in left atrium. 在心脏直视手术中,经房间隔或左上肺静脉,插入左房,吸引左房内的血液。