“…Although the central venous catheter-related complication rate is as high as 10 %, the rate of serious or fatal complications is quite low (1)(2)(3)(4)(5) . Potential complications include failure to enter into the vein for cannulation, subclavian arterial puncture, misplacement of the catheter, pneumothorax, hemothorax, damage to neighboring nerves and mediastinal hematoma (4,5) . The most common complication is pneumothorax with a rate of 2-3 %, and about one-quarter of these complications are observed in unsuccessful catheter attempts (3) .…”