With me, it seems like I've said different things at different times, depending on the possible situation. It's as if as soon as I walk in and usually within the first three seconds something pops into my head. I can't explain it. And it does help if you know what the nature of the call is. If the pt. is alert and talking to you don't get into a tizzy and act like it's something like you've never done before, even if it is. And assure the pt. and those around her that everything that can be done is being done. One "unwritten" rule that I was told back in my first class, is to never, never, assure anyone that "Everything is going to be alright." How many times has a Medic or any medical professional has said that and in just a few minutes the worse outcome has came? But if the pt. is unresponsive, and there IS other's around, don't say, "OH, CRAP!" It sort of ruins the mood. Don't say something that seems generic, crude, or what what could be construed as off color. ALWAYS be professional. Usually let the one with seniority introduce yourselves unless he/she warrants you to. NO PROFANITY [-X , goes a long way. But my very best advice, be yourself.
BTW: I like the previous posts. =D>
BTW 2: Some may agree with me on these points, some may not. Some may have better advice...but we can all learn from each other.