2010 American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care

Robert A. Berg, Chair; Robin Hemphill; Benjamin S. Abella; Tom P. Aufderheide; Diana M. Cave; Mary Fran Hazinski; E. Brooke Lerner; Thomas D. Rea; Michael R. Sayre; Robert A. Swor

Introduction

Basic life support (BLS) is the foundation for saving lives following cardiac arrest. Fundamental aspects of BLS include immediate recognition of sudden cardiac arrest (SCA) and activation of the emergency response system, early cardiopulmonary resuscitation (CPR), and rapid defibrillation with an automated external defibrillator (AED). Initial recognition and response to heart attack and stroke are also considered part of BLS. This section presents the 2010 adult BLS guidelines for lay rescuers and healthcare providers. Key changes and continued points of emphasis from the 2005 BLS Guidelines include the following:

• Immediate recognition of SCA based on assessing unresponsiveness and absence of normal breathing (ie, the victim is not breathing or only gasping)
• "Look, Listen, and Feel" removed from the BLS algorithm
• Encouraging Hands-Only (chest compression only) CPR (ie, continuous chest compression over the middle of the chest) for the untrained lay-rescuer
• Sequence change to chest compressions before rescue breaths (CAB rather than ABC)
• Health care providers continue effective chest compressions/CPR until return of spontaneous circulation (ROSC) or termination of resuscitative efforts
• Increased focus on methods to ensure that high-quality CPR (compressions of adequate rate and depth, allowing full chest recoil between compressions, minimizing interruptions in chest compressions and avoiding excessive ventilation) is performed
• Continued de-emphasis on pulse check for health care providers
• A simplified adult BLS algorithm is introduced with the revised traditional algorithm
• Recommendation of a simultaneous, choreographed approach for chest compressions, airway management, rescue breathing, rhythm detection, and shocks (if appropriate) by an integrated team of highly-trained rescuers in appropriate settings

Despite important advances in prevention, SCA continues to be a leading cause of death in many parts of the world. SCA has many etiologies (ie, cardiac or noncardiac causes), circumstances (eg, witnessed or unwitnessed), and settings (eg, out-of-hospital or in-hospital). This heterogeneity suggests that a single approach to resuscitation is not practical, but a core set of actions provides a universal strategy for achieving successful resuscitation. These actions are termed the links in the "Chain of Survival." For adults they include

• Immediate recognition of cardiac arrest and activation of the emergency response system
• Early CPR that emphasizes chest compressions
• Rapid defibrillation if indicated
• Effective advanced life support
• Integrated post–cardiac arrest care

When these links are implemented in an effective way, survival rates can approach 50% following witnessed out-of-hospital ventricular fibrillation (VF) arrest. Unfortunately survival rates in many out-of-hospital and in-hospital settings fall far short of this figure. For example, survival rates following cardiac arrest due to VF vary from approximately 5% to 50% in both out-of-hospital and in-hospital settings. This variation in outcome underscores the opportunity for improvement in many settings.

Recognition of cardiac arrest is not always straightforward, especially for laypersons. Any confusion on the part of a rescuer can result in a delay or failure to activate the emergency response system or to start CPR. Precious time is lost if bystanders are too confused to act. Therefore, these adult BLS Guidelines focus on recognition of cardiac arrest with an appropriate set of rescuer actions. Once the lay bystander recognizes that the victim is unresponsive, that bystander must immediately activate (or send someone to activate) the emergency response system. Once the healthcare provider recognizes that the victim is unresponsive with no breathing or no normal breathing (ie, only gasping) the healthcare provider will activate the emergency response system. After activation, rescuers should immediately begin CPR.

Early CPR can improve the likelihood of survival, and yet CPR is often not provided until the arrival of professional emergency responders. Chest compressions are an especially critical component of CPR because perfusion during CPR depends on these compressions. Therefore, chest compressions should be the highest priority and the initial action when starting CPR in the adult victim of sudden cardiac arrest. The phrase "push hard and push fast" emphasizes some of these critical components of chest compression. High-quality CPR is important not only at the onset but throughout the course of resuscitation. Defibrillation and advanced care should be interfaced in a way that minimizes any interruption in CPR.

Rapid defibrillation is a powerful predictor of successful resuscitation following VF SCA. Efforts to reduce the interval from collapse to defibrillation can potentially improve survival in both out-of-hospital and in-hospital settings. Depending on the setting and circumstances, earlier defibrillation may be achieved by a variety of strategies that include rescuers who are laypersons, nontraditional first responders, police, emergency medical services (EMS) professionals, and hospital professionals. One of these strategies is the use of an AED. The AED correctly assesses heart rhythm, enabling a rescuer who is not trained in heart rhythm interpretation to accurately provide a potentially lifesaving shock to a victim of SCA.

Immediate recognition and activation, early CPR, and rapid defibrillation (when appropriate) are the first three BLS links in the adult Chain of Survival. BLS care in the out-of-hospital setting is often provided by laypersons who may be involved in a resuscitation attempt only once in their lives. Thus, creating an effective strategy to translate BLS skills to real-world circumstances presents a challenge. This section updates the adult BLS guidelines with the goal of incorporating new scientific information while acknowledging the challenges of real-world application. Everyone, regardless of training or experience, can potentially be a lifesaving rescuer.

The rest of this chapter is organized in sections that address the emergency response system, adult BLS sequence, adult BLS skills, use of an AED, special resuscitation situations, and the quality of BLS. The "Adult BLS Sequence" section provides an overview and an abridged version of the BLS sequence. The "Adult BLS Skills" section provides greater detail regarding individual CPR skills and more information about Hands-Only (compression-only) CPR. The "Special Resuscitation Situations" section addresses acute coronary syndromes, stroke, hypothermia, and foreign body airway obstruction. Because of increasing interest in monitoring and ensuring the quality of CPR, the last section focuses on the quality of BLS.