Bjorkander M, et al. - In this retrospective, multicenter observational study on 10,949 central venous catheter insertions, researchers focused on the risk factors for mechanical complications. They analyzed records of central venous catheter insertions from 8 hospitals in southern Sweden from 2013 to 2016, to gain information on blood coagulation tests, use of ultrasonography, central venous catheter location, bore size, number of needle passes, arterial puncture, the chronological order of the central venous catheter insertion, and mechanical complications. They found mechanical complications were rare. The association of preprocedural coagulopathy, number of needle passes, and arterial puncture with grade 2-4 bleeding was observed. Relation of subclavian vein insertions, arterial puncture, and chronological order of the central venous catheter insertion with pneumothorax was also observed.