Basic CPR Rules Everyone Should Know

Everyone · Explainer · Updated October 1, 2026 · LearnLife Editorial

What is CPR, and why is it important?

CPR, or cardiopulmonary resuscitation, is an emergency procedure performed when someone’s heart stops beating or they stop breathing. It combines chest compressions to manually pump blood through the heart and rescue breaths to provide oxygen to the lungs. The goal is to keep oxygen-rich blood flowing to the brain and vital organs until professional medical help arrives. CPR is crucial because brain cells start dying within minutes without oxygen, leading to permanent damage or death. Being trained in CPR means you can act decisively in emergencies, increasing the chances of survival. CPR is different from general first aid because it specifically addresses sudden cardiac arrest and respiratory failure, which require immediate intervention.

CPR is used outside hospitals by bystanders, first responders, or family members. It’s simple yet powerful—a skill anyone can learn and perform. Learning CPR helps bridge the critical time between collapse and advanced medical treatment, especially since emergency responders may take several minutes to arrive.

How does CPR work? A step-by-step example

Imagine you’re at a park, and a stranger suddenly collapses and is unresponsive. Here is how you’d apply CPR rules:

1. Check responsiveness: Tap their shoulder and shout, “Are you okay?” If no response, proceed.
2. Call for help: Shout for someone to call 911 and get an AED if nearby. If you’re alone, call 911 yourself before starting CPR.
3. Check breathing: Look for normal breathing for no more than 10 seconds. If absent or abnormal gasping, start CPR.
4. Position hands: Place the heel of one hand in the center of the chest, with the other hand on top. For children, one or two hands depending on size; for infants, two fingers just below the nipple line.
5. Start chest compressions: Push hard and fast—at least 2 inches deep for adults and children, 1.5 inches for infants—at a rate of 100-120 compressions per minute. Allow the chest to fully recoil between compressions.
6. Give rescue breaths: After 30 compressions, open the airway by tilting the head back and lifting the chin. Pinch the nose closed and give 2 breaths, each lasting about one second, watching for chest rise.

Repeat cycles of 30 compressions and 2 breaths until help arrives or the person shows signs of life. If you are untrained or uncomfortable giving breaths, hands-only CPR (continuous compressions) is still very effective for adults.

This example highlights how CPR keeps oxygen circulating to vital organs, buying time for advanced care. Each step follows CPR rules designed to maximize effectiveness and safety.

What are the specific CPR rules for adults, children, and infants?

CPR rules differ mainly based on body size and physiology. Here are the key distinctions:

Adults

For adults, use two hands stacked in the center of the chest on the lower half of the breastbone. Compress deeply and quickly at 100-120 compressions per minute. Allow the chest to fully recoil to let the heart fill with blood between compressions. After 30 compressions, give 2 rescue breaths using a proper head tilt to open the airway.

Children

Use one or two hands (depending on the size of the child) for compressions. The depth remains about 2 inches but be mindful not to press too hard. The breathing technique is the same as for adults: 2 breaths after every 30 compressions.

Infants

Use two fingers just below the nipple line for compressions. Press down about 1.5 inches. Be very gentle with rescue breaths—cover the infant’s mouth and nose with your mouth and give small puffs of air, watching for chest rise. The compression-to-breath ratio remains 30:2.

Additional tips

• Always allow full chest recoil.
• Minimize interruptions to compressions.
• If alone with a child or infant, perform about 2 minutes of CPR before calling 911.
• Use an AED as soon as it is available, following its voice prompts.

How do CPR rules differ from related first aid techniques?

CPR is often confused with several other emergency response techniques:

• Heimlich Maneuver (Abdominal Thrusts): Used to clear choking blockages in the airway, not to restart the heart.
• Rescue Breathing: Giving breaths without chest compressions, used only when the person has a pulse but is not breathing adequately.
• AED Use: Automated External Defibrillators provide electrical shocks to help restore the heart’s normal rhythm and are used alongside CPR but are distinct from it.
• Basic First Aid: Encompasses care for cuts, burns, sprains, and other injuries that do not involve cardiac arrest.

Understanding these distinctions helps prevent confusion during emergencies. For example, if someone is choking but breathing, you would perform back blows or abdominal thrusts, not CPR. If a person has no pulse and is not breathing, CPR and AED use are the correct responses.

How can you learn CPR effectively and confidently?

The best way to learn CPR is through a certified training course offered by organizations like the American Heart Association or the American Red Cross. These courses include:

• Hands-on practice with mannequins.
• Step-by-step instruction on compressions, breaths, and AED use.
• Information on recognizing emergencies and how to respond safely.
• Simulation of real-life scenarios for adults, children, and infants.

Training sessions often last a few hours and provide a certification valid for two years. Some courses offer blended learning with online theory and in-person skills testing. Practicing regularly and refreshing your skills every couple of years ensures you stay confident and prepared.

Tips for effective practice:

• Focus on compression rate and depth.
• Practice proper hand placement.
• Learn to recognize when to start and stop CPR.
• Understand how to safely use an AED.

Even if you don’t become certified, watching instructional videos and practicing chest compressions on a pillow can improve your readiness to help.

What are the legal and safety considerations when performing CPR?

Performing CPR is generally protected by “Good Samaritan” laws in most U.S. states, which protect rescuers acting in good faith during emergencies from legal liability. However, some key points to remember:

• Always call 911 before starting CPR, if possible.
• Obtain consent if the person is conscious; if unconscious, implied consent allows you to assist.
• Use barrier devices like a mask for rescue breaths when available to reduce infection risk.
• Stop CPR only when professional help arrives, the person regains consciousness, or you are too exhausted to continue.
• Be mindful that CPR can cause rib fractures or bruising; this is acceptable given the life-threatening situation.

If you’re unsure about legal protections in your state or have concerns after performing CPR, contacting local emergency services or legal aid can provide guidance.

What should you do immediately after performing CPR?

Once emergency responders take over, or the person regains consciousness, your role shifts:

• Provide responders with details about what happened.
• Stay on-site to assist if needed.
• Monitor the person’s breathing and responsiveness until help arrives.
• Care for yourself: performing CPR can be physically and emotionally taxing. Talk with a trusted person or counselor if you feel distressed.
• Consider enrolling in a refresher course to keep your skills current.

If the person does not survive, remember that you still provided critical help. Immediate CPR improves survival chances and brain function outcomes dramatically compared to no intervention.

Frequently asked questions

Can I perform CPR if I’ve never been trained?

Yes. Hands-only CPR—continuous chest compressions without rescue breaths—is recommended for untrained bystanders. Call 911 first, then push hard and fast in the center of the chest until help arrives.

How do CPR rules change for choking victims?

If a person is choking but conscious and coughing, encourage coughing. If they can’t breathe or speak, perform abdominal thrusts (Heimlich maneuver). If they lose consciousness, begin CPR.

Is it safe to perform CPR on someone who has a pulse but isn’t breathing?

No. Rescue breathing alone is appropriate if a pulse is present but breathing is absent. CPR with chest compressions is only for no pulse and no breathing.

How long should CPR be continued?

Continue CPR until the person starts breathing, emergency help arrives, you are too exhausted to continue, or the scene becomes unsafe.

Can children learn CPR, and should they perform it?

Yes. Children and teenagers can learn CPR and are encouraged to do so. They should follow age-appropriate techniques and call for adult help.