Roughly 356,000 out-of-hospital cardiac arrests occur each year in the United States, and an estimated 292,000 adults experience cardiac arrest while already hospitalized. Combined with about 15,200 pediatric in-hospital cases, the total number of cardiac arrests in the U.S. reaches well over 650,000 annually. Globally, emergency medical services treat cardiac arrest at a rate of about 4.1 cases per 100,000 people per year, though that figure varies nearly fourfold across continents due to differences in reporting and emergency response systems.
Out-of-Hospital Cardiac Arrest in the U.S.
The American Heart Association estimates that more than 356,000 out-of-hospital cardiac arrests happen each year in the United States. These are cases where someone’s heart suddenly stops beating in a home, workplace, public space, or anywhere outside a hospital. Survival remains low: only about 9.1% of adults treated by emergency medical services for non-traumatic cardiac arrest survive to hospital discharge.
The majority of these events, roughly 70%, begin with a heart rhythm that cannot be corrected with a defibrillator shock. The remaining 30% start with a “shockable” rhythm, which carries a significantly better chance of survival when treated quickly. This distinction matters because access to a defibrillator in those first few minutes can be the difference between life and death. One study found survival rates as high as 70% when an automated external defibrillator (AED) was used within two minutes of collapse, compared to the single-digit survival rates seen overall.
In-Hospital Cardiac Arrest
Cardiac arrest doesn’t only happen outside hospitals. An estimated 292,000 adult in-hospital cardiac arrests occur in the U.S. each year, with a prediction range between 217,600 and 503,500 cases depending on how different hospitals report and classify events. When repeat cardiac arrests in the same patient are counted, that number rises to about 357,900.
Despite happening in a setting with immediate medical access, in-hospital cardiac arrest is still frequently fatal. The overall mortality rate among hospitalized patients who experience cardiac arrest is about 76%. About 27% of in-hospital cases present with a shockable rhythm, while the remaining 73% involve rhythms that are much harder to treat and carry worse outcomes.
Cardiac Arrest in Children
Pediatric cardiac arrest is far less common than adult cases but still accounts for a significant number of events. Approximately 15,200 children experience cardiac arrest in U.S. hospitals each year. Of those, about 7,100 involve a complete loss of pulse, while roughly 8,100 are classified as events where the heart is still producing some electrical activity but not pumping blood effectively. Including repeat events, the annual pediatric total reaches about 19,900 cases.
Cardiac arrest in children tends to have different causes than in adults. Rather than arising from coronary artery disease or heart attacks, pediatric cases more often result from breathing problems, drowning, trauma, or congenital heart conditions.
Racial and Sex Disparities
Not everyone faces the same risk or receives the same quality of care after cardiac arrest. A nationwide analysis of more than 207,000 in-hospital cardiac arrest cases found significant gaps across racial, ethnic, and sex groups. White men were most likely to present with a shockable rhythm (31.3%), which is associated with better survival. Black women had the lowest rate of shockable rhythms at 21.7%, followed by Hispanic women at 20.8%.
The disparities extend beyond the arrest itself into the treatments patients receive afterward. Black patients were roughly half as likely as white men to receive procedures that restore blood flow to the heart after a cardiac arrest caused by a shockable rhythm. Hispanic men also had lower odds of receiving these interventions. After adjusting for other health factors, Black men, Black women, and Hispanic women all had significantly higher odds of dying after a shockable-rhythm arrest compared to white men.
What Happens to Survivors
One of the biggest fears surrounding cardiac arrest is brain damage from the minutes the brain spends without adequate blood flow. The outlook, however, is better than many people assume for those who do survive. A French study that followed 525 cardiac arrest survivors for two years found that 86% achieved a favorable neurological outcome, meaning they were able to function independently or with only mild disability.
This finding comes with an important caveat: it reflects people who survived long enough to be discharged and followed. Since overall survival rates remain low, especially for out-of-hospital arrests, the 86% figure applies to a relatively small group. Still, it counters the assumption that surviving cardiac arrest inevitably means severe long-term brain injury.
Why Bystander Response Matters
The gap between the 9% overall survival rate for out-of-hospital cardiac arrest and the 70% survival rate when a defibrillator is used within two minutes tells a clear story. Speed is the single biggest factor in cardiac arrest outcomes. Every minute without CPR or defibrillation reduces the chance of survival by roughly 7% to 10%.
Bystander CPR buys time by keeping some blood flowing to the brain and heart until paramedics arrive. Pairing CPR with an AED, which are increasingly available in airports, gyms, schools, and office buildings, gives the best chance of restarting the heart before permanent damage sets in. Despite this, bystander CPR rates in the U.S. hover around 40% to 50% depending on the community, and AED use by bystanders before EMS arrival remains uncommon.
A Rising Concern in Younger Adults
Cardiac arrest has traditionally been viewed as a problem of older age, but data from 1999 to 2020 shows a troubling trend among younger adults. Among Americans aged 25 to 44, sudden cardiac death rates increased steadily over that period, rising from 0.10 per 100,000 people in 1999 to 0.18 per 100,000 in 2020. That translates to an average of 478 deaths per year in this age group alone, with men accounting for roughly three-quarters of cases. The rate of increase was about 1% per year, a small but consistent upward trend that researchers have not fully explained.