What Is CPR? A Plain-English Guide to Cardiopulmonary Resuscitation
CPR, or cardiopulmonary resuscitation, is an emergency technique that combines chest compressions and rescue breaths to keep oxygenated blood flowing to the brain and vital organs when someone's heart stops.
- CPR keeps blood and oxygen moving until advanced care arrives
- Every minute without CPR drops survival odds by about 10%
- Bystander CPR can double or triple a victim's chance of survival
- Modern guidelines emphasize hard, fast chest compressions
What CPR actually does
Cardiac arrest stops the heart from pumping. Chest compressions act as a manual pump, pushing blood through the body so the brain receives oxygen. Rescue breaths add fresh oxygen to that circulating blood when the rescuer is trained and willing.
When to use CPR
Start CPR on any adult, child, or infant who is unresponsive and not breathing normally. Agonal gasps are not breathing. If you are unsure, start compressions — the risk of harm from CPR on someone who does not need it is far lower than the risk of withholding it.
Why training matters
A short CPR course teaches compression depth, rate, hand placement, AED use, and how to coordinate help. Trained bystanders perform CPR longer, deeper, and with fewer interruptions — all of which improve neurological survival.
Frequently asked questions
- How long does CPR training take?
- Most beginner CPR courses run 2 to 4 hours, including hands-on practice and an AED demonstration.
- Can I hurt someone by doing CPR?
- Cracked ribs are possible, but they heal. A heart that never restarts does not. Good Samaritan laws protect bystanders acting in good faith.
- Do I need to give rescue breaths?
- Hands-only CPR is recommended for untrained bystanders responding to adult collapse. Full CPR with breaths is preferred for children, infants, drowning, and overdose.