Methods In this study, 37 cases were punctured through peripheral vein in elbow (PICC group), 49 through infraclavicula, internal jugular or external jugular vein (Superiorvena-cava group).

• 方法37例经肘部PICC（PICC组），49例经颈部锁骨下及颈内、外静脉插管（上腔静脉组）。