Cardiac Arrest in Children: Causes, Signs, and What to Do

Cardiac arrest in children is rare compared to adults, but when it happens the stakes are extraordinarily high: fewer than one in five children who arrest outside a hospital survive, while roughly four in ten survive when it happens inside one. The causes, warning signs, and best responses differ from what most people know about adult cardiac arrest, and those differences matter. A child’s heart usually stops for different reasons than an adult’s, the recognition challenges are distinct, and the CPR technique that works best for kids is not the same as what is now widely taught for adults.

Why Children Go Into Cardiac Arrest

In adults, cardiac arrest is overwhelmingly caused by heart disease, most often a heart attack that triggers a fatal rhythm. In children, the picture is broader. The heart may stop because of a structural defect, an inherited electrical problem, a chest impact during sports, a near-drowning, a severe asthma attack, a choking event, or an overwhelming infection. In many pediatric cases, the arrest starts as a breathing problem or shock that worsens until the heart gives out, rather than the heart failing first on its own. This is one of the most important distinctions between pediatric and adult cardiac arrest, and it shapes everything from prevention to treatment.

Among children who die suddenly from a cardiac cause, most have an underlying structural heart condition, with hypertrophic cardiomyopathy and coronary artery anomalies being the most common findings across most case series.¹ Hypertrophic cardiomyopathy causes portions of the heart muscle to thicken abnormally, which can disrupt electrical signals and trigger a lethal rhythm during exertion. Coronary artery anomalies mean the blood vessels feeding the heart are shaped or routed abnormally, sometimes pinching off blood flow during exercise. Neither condition reliably announces itself before a crisis.

Inherited electrical disorders are another major category. Long QT syndrome, for example, is a genetic condition where the heart’s electrical recovery between beats takes longer than it should. In one series of children diagnosed with long QT syndrome, about 10% were identified only after they had already experienced a cardiac arrest, and roughly 18% had experienced fainting episodes beforehand.² Some forms of long QT syndrome are caused by rare mutations, including in genes like TRDN, which can cause exercise-triggered cardiac arrest in children as young as one year old.³

Then there is commotio cordis, a phenomenon where a blunt blow to the chest, even one that does not cause any visible injury, triggers sudden cardiac arrest. This typically happens during sports when a ball or another player’s body strikes the chest at exactly the wrong moment in the heartbeat cycle. The child has no underlying heart disease; it is purely a matter of timing and location of impact.⁴ It is most common in young males playing baseball, hockey, or lacrosse, because their chest walls are thinner and more compliant than an adult’s.

Warning Signs That Often Get Missed

One of the most frustrating aspects of pediatric cardiac arrest is that warning signs are frequently present beforehand but go unrecognized. Published data show that in many cases, preceding symptoms and signs exist but are misinterpreted or dismissed by medical staff and families alike.⁵ These warning signs can include:

Fainting during exercise: Passing out while running, swimming, or playing a sport, especially if it happens repeatedly, can signal an underlying rhythm disorder or structural heart problem. Fainting at rest is less concerning from a cardiac standpoint, though still worth evaluating.
Chest pain with exertion: While most chest pain in children turns out to be musculoskeletal or anxiety-related, pain that occurs specifically during physical activity and resolves with rest deserves cardiac evaluation.
Unexplained seizures: A cardiac rhythm disturbance can cause loss of consciousness and convulsions that mimic epilepsy. Some children are treated for a seizure disorder for years before the true cause is identified.
Family history: A close relative who died suddenly and unexpectedly before age 50, or a family member with a known heart rhythm disorder, raises the risk.
Palpitations or racing heart: Occasional awareness of one’s heartbeat is normal, but sustained episodes of a fast or irregular rhythm during activity warrant investigation.

The challenge is that each of these symptoms has many non-cardiac explanations, so they are easy to attribute to something benign. Attention to the details of a child’s personal and family history during routine checkups is one of the most practical strategies for catching these conditions before they cause a crisis.

Recognizing Cardiac Arrest When It Happens

When a child actually goes into cardiac arrest, recognizing it quickly can be surprisingly difficult. The child will be unresponsive and will either not be breathing at all or will be making occasional gasping breaths. Those gasps, called agonal breathing, are a major source of confusion. They can look like the child is still breathing, which leads bystanders and even emergency dispatchers to delay starting CPR. Research on emergency calls for pediatric cardiac arrest has identified agonal or irregular breathing as a key barrier to correct identification of the arrest.⁶

If a child collapses, is unresponsive, and is not breathing normally, treat it as cardiac arrest. Do not wait for breathing to stop completely. Gasping is not real breathing, and every minute without CPR reduces the chance of survival.

How to Do CPR on a Child

For children, conventional CPR that includes rescue breaths along with chest compressions produces better results than hands-only (compression-only) CPR. This is a meaningful departure from the messaging many adults have heard about adult cardiac arrest, where compression-only CPR has been promoted as “just as good” for bystanders. In children, it is not.

A systematic review and meta-analysis found that one-month survival was about 18% with conventional CPR compared to roughly 12% with compression-only CPR, and favorable neurological outcomes followed the same pattern: about 9% with conventional CPR versus about 6% with compression-only.⁷ An earlier large study from Japan similarly found that conventional bystander CPR was associated with substantially better neurologically favorable survival than compression-only CPR, and both were far better than no bystander CPR at all.⁸

The reason goes back to the cause of arrest. Because many pediatric arrests stem from breathing problems rather than primary heart rhythm failure, the child’s blood oxygen is often already dangerously low by the time the heart stops. Chest compressions alone circulate whatever oxygen is left in the blood, but rescue breaths add new oxygen. For an adult whose arrest started with a sudden heart rhythm problem, the blood may still have adequate oxygen for the first several minutes, making compressions alone more viable. For a child who suffocated, drowned, or choked, that oxygen reserve is already depleted.

The standard ratio for a single rescuer is 30 chest compressions followed by 2 breaths. For infants under one year old, compressions are done with two fingers on the breastbone, pushing about one and a half inches deep. For children aged one through puberty, the heel of one hand is typically enough, compressing about two inches deep. Push hard, push fast (at least 100 compressions per minute), let the chest fully recoil between compressions, and minimize interruptions. If you are unable or unwilling to give breaths, compression-only CPR is still far better than doing nothing.

Using an AED on a Child

Automated external defibrillators work on children and should be used if one is available. Many AEDs come with pediatric pads or have a pediatric mode that delivers a lower-energy shock appropriate for a smaller body. In a report on AED use with pediatric pads, the devices correctly identified shockable rhythms in children as young as a few months old and appropriately withheld shocks in children with non-shockable rhythms.⁹ If pediatric pads are not available, adult pads can be used. An imperfect shock is better than no shock.

That said, shockable rhythms are less common in pediatric cardiac arrest than in adults. Children more frequently present with asystole or pulseless electrical activity, neither of which responds to defibrillation. The AED will analyze the rhythm and only advise a shock if one is appropriate, so there is no danger of delivering an unnecessary shock. Apply the pads, follow the voice prompts, and continue CPR between analyses.

What Happens When the Medical Team Arrives

Once paramedics or hospital staff take over, several time-sensitive interventions come into play. Epinephrine (adrenaline) is the primary drug used during pediatric resuscitation. A large study of in-hospital pediatric cardiac arrests found that each minute of delay in giving the first dose of epinephrine was associated with lower chances of getting the heart restarted and lower chances of survival with a good neurological outcome.¹⁰ More recent research has also examined how frequently subsequent doses should be given. Dosing intervals shorter than three minutes were associated with faster return of a heartbeat and shorter CPR duration, though the benefit for long-term neurological outcomes was clearest in a specific subset of children who were already on blood-pressure-supporting medications at the time of arrest.¹¹

Airway management during pediatric resuscitation also follows different rules than many people expect. Intubation, where a tube is placed directly into the windpipe, is sometimes assumed to be the gold standard. But evidence from pediatric out-of-hospital cardiac arrest data suggests the opposite: basic bag-mask ventilation was associated with higher survival to hospital discharge compared to either intubation or placement of a supraglottic airway device.¹² A systematic review confirmed this pattern, finding better outcomes with bag-mask ventilation than with either advanced technique.¹³ The likely explanation is that attempting intubation during active resuscitation interrupts chest compressions and introduces procedural complications, especially in small airways.

Temperature Management After Resuscitation

After a child’s heart is restarted, the brain remains at serious risk from the injury it sustained during the arrest. One strategy used in intensive care is targeted temperature management, where the child’s body temperature is carefully controlled to prevent or reduce fever. A quality-improvement project found that implementing a structured temperature management protocol reduced both the duration and frequency of fever in children who survived cardiac arrest.¹⁴

There is also early evidence suggesting that longer periods of therapeutic cooling may be better. A network meta-analysis found that 72 hours of targeted temperature management was associated with higher survival and better neurological outcomes compared to shorter cooling durations or maintaining normal body temperature alone.¹⁵ However, the certainty of this evidence is rated very low, meaning the optimal duration remains an active area of research rather than settled practice.

Survival Rates and Where the Arrest Happens

Whether a child’s cardiac arrest occurs inside or outside a hospital has an enormous impact on survival. A nationwide U.S. study found survival rates of roughly 40% for in-hospital pediatric cardiac arrest compared to about 19% for those occurring in the emergency department, which serves as a rough proxy for out-of-hospital arrivals.¹⁶ A multicenter study similarly showed higher mortality for out-of-hospital cases (62%) compared to in-hospital cases (51%), with the cause of death attributed to brain injury far more often in the out-of-hospital group.¹⁷

The difference comes down to response time and monitoring. In a hospital, the arrest is detected within seconds, a team responds immediately, and medications and defibrillation are at hand. Outside the hospital, minutes pass before CPR begins, more minutes pass before paramedics arrive, and the brain suffers irreversible damage with each passing minute of inadequate blood flow.

Long-Term Outcomes for Survivors

Surviving a pediatric cardiac arrest does not mean returning to baseline. A study following survivors at a median of about five and a half years after arrest found that healthcare needs and educational support requirements were common across all survivors, even those who appeared to have a favorable outcome at hospital discharge.¹⁸ Children who had unfavorable outcomes at discharge showed greater impairments in sensory and motor function, higher use of rehabilitation services, and more disruption to family functioning years later.

Neuropsychological testing of survivors paints a more detailed picture. On average, cardiac arrest survivors scored lower than the general population on measures of overall intelligence, with a mean full-scale IQ of about 87 compared to the norm of 100. Visual memory and processing speed were particularly affected, while verbal memory recognition was relatively preserved or even slightly better than average.¹⁹ Parents tended to report relatively good executive functioning at home, but teachers reported more problems with planning and organizing in school, suggesting that the structured classroom environment reveals difficulties that a more flexible home setting may mask.

These findings point to the importance of ongoing follow-up and support. A child who seems to recover well in the hospital may still struggle academically or need rehabilitative services for years. Families should expect and plan for long-term monitoring rather than assuming the crisis is over once the child is discharged.

Disparities in Who Gets Bystander CPR

Not every child who collapses has an equal chance of getting bystander CPR, and the disparities are stark. Using data from the Cardiac Arrest Registry to Enhance Survival (CARES), researchers found that Black children were about 40% less likely to receive bystander CPR than white children, and Hispanic children were about 22% less likely.²⁰ Neighborhood characteristics compounded the gap: children in lower-income, lower-education neighborhoods received bystander CPR less often regardless of race, and Black children in the most disadvantaged neighborhoods were roughly half as likely to receive bystander CPR compared to white children in the most advantaged neighborhoods.

These patterns are consistent with broader research on cardiac arrest across all ages, which has shown that Black and Hispanic individuals are less likely to receive bystander CPR than white individuals in both home and public settings, and that the disparity persists across all neighborhood income levels.²¹ The reasons are complex and likely include differences in CPR training access, fear of legal liability, language barriers, and distrust of emergency systems. Targeted CPR training in underserved communities is one of the most practical interventions researchers have proposed.

The Role of 911 Dispatchers

Even when bystanders are untrained, dispatcher-assisted CPR can close the gap. In a large prospective study from Japan, offering CPR instructions over the phone increased the rate of bystander CPR more than sevenfold. Children who received bystander CPR with dispatcher guidance had significantly better neurological outcomes at one month compared to those who received no bystander CPR at all.²² Telecommunicator-guided CPR has been identified as an important strategy to increase both early recognition and early CPR in pediatric out-of-hospital cardiac arrest.²³

If you call 911 for a child in cardiac arrest, stay on the line. The dispatcher can walk you through CPR in real time, including how deep to compress, how fast to go, and when to give breaths. You do not need to have taken a class. You need to be willing to act and to follow instructions.

Screening Young Athletes

Because competitive sports are a common trigger for sudden cardiac arrest in children with undiagnosed heart conditions, pre-participation screening has been debated for decades. The American Heart Association recommends a health history and physical exam before clearing a young athlete for sports. Whether a routine electrocardiogram (ECG) should be added to that screening has been contested. An influential Italian study by Corrado and colleagues found that mandatory ECG screening reduced the annual rate of sudden cardiac death in young athletes by 90%, but replicating that result in other healthcare systems has proven difficult.²⁴

The debate is not just about whether ECGs detect problems. They do, with reasonable sensitivity for conditions like hypertrophic cardiomyopathy and long QT syndrome. The arguments against universal screening center on cost, false positives (which lead to unnecessary follow-up testing and sometimes inappropriate restriction from sports), and the sheer number of children who would need to be screened to prevent one death given how rare these events are. For individual families, particularly those with a family history of sudden cardiac death or known genetic heart conditions, pursuing an ECG and possibly an echocardiogram for a child entering competitive athletics is a reasonable step to discuss with a pediatrician.

Psychological Impact on Families

A child’s cardiac arrest is among the most traumatic events a family can experience, and the psychological toll extends well beyond the acute crisis. Research on family members who witness resuscitation has found that the rate of post-traumatic stress symptoms one month after the event was roughly twice as high in relatives who were present during the resuscitation compared to those who were not.²⁵ Parents of survivors with neurological impairment report greater disruption to family functioning years later, including financial strain from ongoing therapy, changes in employment, and the emotional weight of caring for a child whose capabilities have changed.¹⁸

Mental health support for caregivers is not a luxury or an afterthought. It is part of the recovery process for the entire family. Hospitals with pediatric cardiac arrest programs increasingly integrate social work, psychology, and peer support into their post-arrest care pathways, though access varies widely depending on where you live and what insurance covers.