All PICCs were single lumen 4Fr , inserted according to a well-defined protocol - maximal barrier precautions , ultrasound guidance , intracavitary electrocardiography ( IC-ECG ) , and so on -- and managed according to the recommendations of the most recent guidelines ( antisepsis with 2 % chlorhexidine , transparent dressing , sutureless device , strict ` scrub the hub ' policy , neutral displacement needle-free connectors and so on ) .