well being a medicine houseman i have to introduce a lot of central lines.i m most comfortable with subclavians.but last few days hv not been good with those.there has been some problem or the other.it probably started with i failing to introduce 1 a few days back.it probably affected my confidence at a subconscious level.i was finally able to introduce 1 today without any hassles.i think this should end my bad days at putting central lines.