I found that at least 50% of "the previous nurse did this" claims were untrue! People just don't like change and they're going to see what they can get away with. Nurse passes have made a huge difference. I got my principal on board first, then he presented the vague idea of an easy way to communicate with the nurse, and, ta-da! the teachers had this amazing idea for passes
In my experience, teachers have this whole way of communicating that involves a lot of smiley faces and exclamation points. My first year, I would email them the same way I would email a nurse co-worker and they would say I was being mean. I've learned to add unnecessary exclamation points and "thanks so much", "thanks for your help..." ect and that seems to work.
It does get better.