Keep an open mind, and realize that ICU and ER are two different animals. A lot of things are identical, but you will need to be prepared for the differences. Study when you can so that you more fully understand your patients and their condition. ICU will show you lots of new things that you may not have encountered before, such as ARDS, VAP etc. Study up on those. I highly recommend the icufaqs.org site. A lot of it you may already know, but it's a great resource. Good luck to you!