Cardiac arrest strikes without warning and claims over 350,000 lives outside of hospitals each year in the United States. According to the American Heart Association, immediate high-quality CPR can double or even triple a victim's chance of survival. Yet many bystanders hesitate because they are unsure of the correct technique. This guide walks you through every step based on the latest AHA guidelines.
Step 1: Ensure the scene is safe. Before approaching the victim, quickly scan for hazards such as traffic, fire, or electrical dangers. Once safe, tap the person firmly on the shoulders and shout "Are you okay?" If there is no response and the person is not breathing or only gasping, call 911 immediately or direct someone nearby to call while you begin CPR.
Step 2: Place the victim on a firm, flat surface. Kneel beside their chest. Place the heel of one hand on the center of the chest, right on the lower half of the breastbone (sternum). Place your other hand on top and interlace your fingers. Keep your fingers lifted off the ribs. Lock your elbows straight and position your shoulders directly above your hands so you can push straight down.
Step 3: Push hard and push fast. The AHA recommends compressing the chest at least 2 inches deep for adults but no more than 2.4 inches. Maintain a rate of 100 to 120 compressions per minute — roughly the tempo of the song "Stayin' Alive" by the Bee Gees. Allow the chest to fully recoil between each compression. Incomplete recoil reduces blood flow back to the heart and decreases the effectiveness of CPR.
Step 4: Minimize interruptions. Every pause in compressions means blood stops flowing to the brain and vital organs. The AHA emphasizes that chest compression fraction — the percentage of time compressions are being performed — should be at least 60 percent, ideally above 80 percent. If you are trained in rescue breathing, deliver two breaths after every 30 compressions. If you are not trained or uncomfortable with mouth-to-mouth, hands-only CPR with continuous compressions is still highly effective and recommended by the AHA for untrained bystanders.
Step 5: Use an AED as soon as one is available. Automated External Defibrillators are designed for use by anyone. Turn it on, follow the voice prompts, attach the pads to the bare chest, and let the device analyze the heart rhythm. If a shock is advised, make sure no one is touching the victim and press the shock button. Resume CPR immediately after the shock. Continue until emergency medical services arrive or the person begins to breathe normally.
Common mistakes to avoid: Do not compress too shallow — studies show most rescuers do not push deep enough. Do not lean on the chest between compressions. Do not interrupt compressions for more than 10 seconds at a time. And do not be afraid to act. The AHA states that any attempt at CPR is better than no attempt. You cannot make the situation worse for someone in cardiac arrest — they are already in the most critical condition possible.
AHA Sources & Further Reading
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