Most healthcare facilities have emergency/disaster plans for preparing their emergency rooms and trauma centers for a sudden influx of patients, according to an article on the WNCN website.
Plans should include precise communication and a well-coordinated command center within the hospital.
Most hospitals have an alert system that notifies all essential personnel such as surgeons and/or staff to be on site quickly.
To prepare for the worst, hospitals and staff routinely conduct emergency response drills in order to be ready to deal with the worst disasters.