What is the proper depth for chest compressions in CPR for adults?

The proper depth for chest compressions in CPR for adults is at least 2 inches. This guideline is established based on research showing that compressions of this depth are effective at generating adequate blood flow during cardiac arrest. Compressions that are too shallow may not be effective in circulating blood, which is crucial for maintaining blood flow to vital organs.

The recommendation for compressions to be at least 2 inches ensures that sufficient pressure is applied to the chest, allowing the heart to pump blood more effectively during each compression. Additionally, the compressions should be performed at a rate of 100 to 120 compressions per minute to further enhance the chances of survival.

When considering the options, while less than 2 inches may not adequately compress the chest and might not provide the necessary circulatory support, greater depths beyond 2.5 inches can potentially lead to injury, such as fractured ribs or damage to organs. Therefore, maintaining the depth at around 2 inches strikes a balance between effectiveness and safety, making it the correct choice for adult CPR.