Understanding surge capacity: essential elements.

As economic forces have reduced immediately available resources, the need to surge to meet patient care needs that exceed expectations has become an increasing challenge to the health care community. The potential patient care needs projected by pandemic influenza and bioterrorism catapulted medical surge to a critical capability in the list of national priorities, making it front-page news. Proposals to improve surge capacity are abundant; however, surge capacity is poorly defined and there is little evidence-based comprehensive planning.