This document provides guidance on treating bradycardia and pulseless electrical activity (PEA). It lists potential causes of bradycardia and PEA including hypovolemia, hypoxia, acidosis, electrolyte imbalances, hypoglycemia, hypothermia, toxins, tamponade, tension pneumothorax, thrombosis, and trauma. It recommends investigating and treating the underlying cause, such as providing fluids for hypovolemia, ensuring proper ventilation for hypoxia, correcting electrolyte levels, and treating hypothermia. The electrocardiogram may provide clues to the cause of PEA.