Dr. Stephanie Kayden had just returned to the emergency room, after grabbing a slice of quiche in the hospital cafeteria. A resident pulled aside the senior doctor to discuss a pregnant woman who was vomiting. It was strangely serene for Marathon Monday.
Suddenly, a dispatcher’s voice crackled over a speakerphone at the nurses’ station. All Kayden caught was “Bombings’’ and “Copley Square.’’