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A PEM group is performing a quality improvement initiative to improve ED flow in the busy evening shift of their 12-bed PED. They implement a fast-track using three patient care rooms, one nurse, and one physician. They gather data after implementation but find that ED flow is not improved because of the loss of ¼ of their patient care rooms to the new fast track. They then adjust their initiative to using only two rooms and re-gather data. 

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