Cardiopulmonary resuscitation (CPR) is an emergency procedure which is performed in an effort to manually preserve intact brain function until further measures are taken to restore spontaneous blood circulation and breathing in a person in cardiac arrest. Sudden cardiac arrest is the leading cause of death in the industrialised world. Early bystander's CPR has been recognised as one of the most effective interventions in improving outcome and as an essential link of the survival's chain. In this book the authors present current research in the study of CPR, including predictors of survival from out-of-hospital cardiac arrest; aspirin resistance in cardiovascular disease; out-of-hospital cardiac arrest in children and results of experience from a cardiopulmonary resuscitation program in Spain.