Ghobadi A, et al. - In order to assess the effectiveness of specific treatment guidelines on altering opioid prescribing in the Emergency Department (ED), researchers examined provider ordering patterns before and after implementation of opioid use guidelines for ED patients overall and the specific subsets of ED patients with either chronic opioid use or fracture. Observations revealed that the use of an opioid ordering guideline resulted in significant reduction in parenteral opioid use in the ED. Intended subgroup comparisons suggest that acute fractures were not affected and chronic pain visits were associated with larger decreases in opioid use.