atprep.在；向；达n.基普(老挝货币基本单位)(=att)；[化]砹(极不稳定放射性元素)abbr.密封的(=airtight)abbr.气温(=air temperature)Atkan阿特坎

1. Atrial septal defects occur when the partitioning process does not occur completely, leaving an opening in the atrial septum.
   如果在间隔形成的过程中发育不全，即可在房间隔上留下一个洞。
2. 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。