CHICAGO - Many hospitals call it "code blue," a signal given over the intercom when a patient's heart has stopped. When code blue works well, a team speeds to the bedside and revives the patient. The ...

A nurse in Phoenix hears the overhead call—“Code Blue, Room 314.” She sprints in. The patient is unresponsive, pulse fading. As she starts CPR, muscle memory kicks in—not just from textbooks, but from ...