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Atrial fibrillation care improvement collaborative. Atrial fibrillation (AF) is an increasingly common cardiac arrhythmia. Many patients with new onset or recurrent AF present to the emergency department and are subsequently admitted to the hospital and seen by cardiology specialists for follow up. In an attempt to address this high utilization of acute health care resources, reduce costs, and improve patient care, our institution instituted a collaborative project between the departments of emergency medicine, cardiology, family medicine, and primary care internal medicine. The project team oversaw development of a new emergency department AF order set, encouraged utilization of a new oral anticoagulant (dabigatran), improved the primary care follow up connection, and deployed a multimodal education plan for primary care providers. Between 2012 and 2014, these interventions resulted in a 17% reduction in total AF per member per month (PMPM) cost, a 28% reduction in AF PMPM inpatient cost, and a 24% reduction in inpatient admissions for AF.