I am an ED RN in a fairly busy ED in Washington state. We just implemented a fast track model in our ED, and are now looking at our staffing ratios to see if they need an adjustment, based on RN feedback. The model puts low acuity and easy 3's through the Fast Track, and this leaves higher acuity patients clustered on the back end. We have always been a 4:1 RN ratio, but staff is asking if we should go to 3:1 on the back end. The Fast Track is capturing a significant number of the easy 3 chip shots, so it does appear that back end RN's have an increased load. However, I am tasked with looking at evidence for current best practice staffing models, and possibly looking at acuity based staffing options. I'm looking for feedback from others with experience in comparable staffing ratios, specifically those that are at 3:1, Fast Track models, or use acuity based staffing.