“…In 2005, the American Heart Association published guidelines regarding the care of critically ill children 1 in which IO line access is described as a class IIa recommendation for emergent vascular access in children when intravenous access cannot be established quickly. Intraosseous line use has been described in the prehospital setting 2Y6 and emergency department (ED) setting, 7Y10 with limited reports of IO line use in trauma patients, 11,12 burn patients, 13 in the patients in the operating room, 14 and in all ages of pediatric patients including neonates. 15,16 However, there are no studies utilizing populationbased data describing the incidence of IO line use, characteristics of patients and hospitals in which it is used, mortality of patients in whom an IO line is placed, or complication rates from the procedure.…”