When Was CPR Invented?

Before there was cardiopulmonary resuscitation, there was panic. People had always understood that a stopped heart was a death sentence, but the idea that an untrained bystander could intervene, that you could push on someone’s chest and breathe into their mouth and pull them back, that idea didn’t exist until the middle of the twentieth century. The story of how CPR was invented is a story about scientists working on separate problems who didn’t initially know they were building toward the same thing.

Did CPR Exist Before Modern CPR?

Resuscitation attempts are not a modern invention. Physicians and rescuers had been trying to revive apparently dead people for centuries, they just didn’t have an effective method. Techniques from the 1700s and 1800s included the “bellows method,” using actual bellows to push air into a person’s lungs, and various manual compression approaches that focused on moving the chest and arms. Medical societies in Europe were publishing resuscitation guidelines as early as the 1790s, primarily aimed at drowning victims.

Through the late 1800s and early 1900s, internal cardiac massage, where a surgeon opens the chest and manually squeezes the heart, was occasionally performed in operating rooms. It worked in rare, controlled circumstances. It was obviously not something a bystander on a street corner could do.

What was missing was a way to combine effective breathing support with effective circulation support in a technique that could be taught to ordinary people and used outside of surgical settings. That combination wouldn’t come together until three separate researchers made three separate breakthroughs within a few years of each other.

The 1950s Breakthroughs That Changed Resuscitation

The first piece was ventilation. In the early 1950s, Dr. James Elam, an anesthesiologist, demonstrated through careful study that expired air, the air a person breathes out, contains enough oxygen to sustain another person. This challenged the prevailing assumption that you needed pure, fresh oxygen to revive someone. Elam’s work established that mouth-to-mouth ventilation was physiologically sound.

Dr. Peter Safar took that research and ran with it. An Austrian-born physician working in the United States, Safar conducted systematic experiments in the mid-1950s comparing mouth-to-mouth ventilation against the arm-lift and chest-pressure methods that were then considered standard. His results were unambiguous: mouth-to-mouth was more effective, more reliable, and could be learned quickly. By 1957 and 1958, Safar was publishing findings that would become the foundation of rescue breathing as we know it. The U.S. military adopted mouth-to-mouth resuscitation based partly on his work.

The second piece was circulation. In 1958, a Johns Hopkins electrical engineer named William Kouwenhoven, working alongside colleagues James Jude and G. Guy Knickerbocker, made a discovery that would eventually change everything. While researching defibrillation, how electrical shocks might restart a stopped heart, they observed that pressing firmly on the chest of a dog whose heart had stopped could create measurable blood flow. Kouwenhoven, Jude, and Knickerbocker began experimenting systematically, and what they found was that external chest compression could substitute, at least temporarily, for the pumping action of the heart. The rib cage, it turned out, could be compressed enough to squeeze the heart and push blood through the circulatory system without opening the body at all.

This was a profound shift. Internal cardiac massage required a surgeon and a scalpel. External chest compression required hands and willingness.

1960 and the Birth of Modern CPR

The year 1960 is the landmark date in the history of cardiopulmonary resuscitation. Kouwenhoven, Jude, and Knickerbocker published their landmark paper in the Journal of the American Medical Association describing external chest compression as a method for cardiac resuscitation. Their report documented 20 cases in which the technique had been used on patients, with a survival rate that attracted immediate attention.

Also in 1960, Peter Safar collaborated directly with Kouwenhoven and Jude to combine rescue breathing with chest compressions into a unified technique. The two elements, ventilation and circulation, fit together into what Safar named “cardiopulmonary resuscitation.” The name stuck. CPR as a combined method of mouth-to-mouth ventilation and external chest compression entered the medical literature and began spreading rapidly through the hospital community.

What made this revolutionary was not just the technique itself but its accessibility. Kouwenhoven, then in his seventies, reportedly said at a presentation that “anyone, anywhere, can now initiate cardiac resuscitative procedures.” That claim, that CPR was teachable to laypeople, not just physicians, was radical at the time and proved to be correct.

When the American Heart Association Endorsed CPR

The American Heart Association moved quickly. In 1963, the AHA formally endorsed CPR as a resuscitation method and began working to spread training beyond hospital walls. This was a pivotal institutional step, the AHA had the reach and credibility to turn a medical technique into a public health intervention.

In 1966, a national conference produced the first standardized guidelines for CPR and emergency cardiac care, providing a consistent framework that could be taught uniformly across the country. These guidelines set compression ratios, ventilation rates, and the basic sequence of steps that would be refined over subsequent decades but remain recognizable in modern CPR training.

Community training programs began in earnest through the 1970s. The idea that ordinary citizens, not just medical professionals, should know CPR moved from a novel proposition to a public health consensus. Millions of people were trained through community programs, workplace trainings, and eventually school curricula.

How CPR Continued to Evolve

The history of CPR didn’t stop at 1966. The technique has been continuously studied, challenged, and refined as evidence accumulated about what actually improves survival.

The AED, automated external defibrillator, became a companion technology starting in the 1970s and 1980s. Dr. Frank Pantridge in Belfast is credited with developing the first portable external defibrillator in the 1960s, a device that eventually led to the AEDs now mounted in airports, schools, and offices. The relationship between CPR and defibrillation, CPR buys time, the AED restores rhythm, became the cornerstone of the “chain of survival” framework that guides emergency response today.

Guidelines have shifted over time as research clarified what matters most. The 2010 AHA guidelines made a significant change to the taught sequence: rather than the traditional airway-breathing-compressions order, the guidelines moved compressions first, reflecting evidence that starting chest compressions immediately, before pausing to open the airway, improved outcomes. Compression depth and rate recommendations have been refined based on studies measuring actual blood flow generated by different techniques.

Hands-only CPR, continuous chest compressions without rescue breathing, gained formal endorsement for use by untrained bystanders responding to adult cardiac arrest. The recognition that hesitation around mouth-to-mouth was reducing bystander response rates led to clearer guidance: if you’re not trained or not comfortable with rescue breaths, compressions alone are far better than nothing.

The development of CPR spans roughly sixty years of refinement from a 1960 publication to the most recent AHA guidelines. What hasn’t changed is the core insight: that a person whose heart has stopped can be kept viable by someone using their hands and, when trained, their breath, buying time until the technology and expertise needed to restore a normal heartbeat can arrive. That insight, first demonstrated in a laboratory at Johns Hopkins and published in a medical journal in 1960, has saved millions of lives since.