5Venkatesan T, Sen N, Korula PJ, et al. Blind placements of peripherally inserted antecubital central catheters: initial catheter tip position in relation to carina[J]. Br J Anaesth, 2007, 98(1): 83-88.
6Krinsley James S,Barone James E.The drive to survive: unplanned extubation in the ICU. Chest . 2005