Your pager startles you awake. Blurry eyed, you see the message — CODE BLUE, PEDIATRIC ICU. You arrive at the bedside of an 18-month-old girl who was admitted with severe bronchiolitis. She had been in respiratory distress, and despite high-flow oxygen and inhaled bronchodilators, minutes after arriving in the ICU she became bradycardic, then pulseless. As the overnight pediatric resident, you are responsible for leading the code. The nurses and interns perform chest compressions, the anesthesiologist intubates, and the ICU fellow doses the epinephrine.