By Evelyn McCormack | Updated Mar 24, 2022
CPR—short for cardiopulmonary resuscitation—is an emergency intervention that restores circulation and breathing in a person whose heart has stopped or who has stopped breathing. By performing chest compressions and, when necessary, rescue breaths, a trained responder can keep vital organs oxygenated until advanced medical help arrives.
CPR stands for cardiopulmonary resuscitation.
For over five decades, CPR has evolved from a simple chest‑compression technique into a lifesaving protocol endorsed by the American Heart Association (AHA). In 2021, the AHA updated its guidelines, recommending chest compressions alone—without rescue breaths—for adults who collapse from sudden cardiac arrest. This change reflects evidence that compressions alone can maintain sufficient blood flow for the first few minutes of arrest.
When the heart stops, blood ceases to circulate, depriving organs—especially the brain—of oxygen. The brain can suffer irreversible damage in as little as seven minutes, with significant harm occurring after four minutes of oxygen deprivation. CPR bridges this critical gap, delivering oxygenated blood until professional care can take over. In drowning, carbon‑monoxide poisoning, or drug overdose scenarios, rescue breaths are also vital to restore breathing.
It is often assumed that CPR alone guarantees survival. In reality, only 5‑10% of patients who receive CPR without additional intervention survive. However, when CPR is combined with rapid defibrillation, survival rates can climb to 40%—particularly if CPR starts within four minutes and defibrillation follows within ten minutes.
The most reliable way to prepare for an emergency is to complete a certified CPR course. The American Red Cross and the AHA offer classes nationwide, tailored to all ages and professions. These courses cover the fundamentals of chest compressions, rescue breathing, and the use of automated external defibrillators (AEDs).
Modern CPR guidelines distinguish between two primary approaches:
