I am probably a few years late for this thread but I thought I would put my two cents in! i am currently working at a Private Hospital Intensive Care unit which specialises in all specialties in sydney. I have also previously worked in one of the leading neursurgical ICUs in Sydney. At both of my areas of employment we ALWAYS level our arterial lines at the tragus for all our neuro patients. I know that this is also common practice at most other neuro ICUs in Sydney. However, I have not been able to find any evidence or documentation to back this up. It is just what we do and i think the initial orders for this have come from our neuro surgeons. If anyone could tell me where I could find information to back up this practice i would be greatful! I have just because the CNE in my unit and the cluey new staff are wanting to know why we do what we do! Thanks!!