Commotio Cordis: What It Is, Why It Happens, and How It's Treated
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 17, 2026
Quick Answer: What is commotio cordis?
Commotio cordis is a condition in which ventricular fibrillation and cardiac arrest happen immediately when a small, hard object hits the chest over the heart at a critical instant in the heartbeat [3] [5]. It mostly affects young male athletes [1] [3] [5]. Survival is about 59% with prompt treatment, so call 911, start CPR and use an AED as soon as possible [5] [6].
What the research says
Survival from commotio cordis has risen sharply. According to PubMed, a US registry analysis of 216 cases found survival of 10% in 1970-1993, 34% in 1994-2012 and 58% in the most recent 6 years. Resuscitation within 3 minutes was linked to 40% survival versus 5% after 3 minutes, and an on-site AED was protective (Maron et al., Heart Rhythm, 2013) [1].
It is a leading cause of sudden death in young athletes, and speed decides the outcome. A 2023 review reports it is the third most common cause of sudden cardiac death in young athletes, with more than 75% of cases during organized and recreational sports. Survival is closely tied to how quickly CPR and defibrillation start (Peng et al., Sports Medicine, 2023) [2].
The blow must land in a narrow window, and prevention is possible. Impact during a narrow window of repolarization causes ventricular fibrillation, and improved recognition and resuscitation have improved outcomes (Link, Current Cardiology Reports, 2014) [3].
Study details are from PubMed abstracts.
What Is Commotio Cordis?
Commotio cordis is a condition in which an abnormal heart rhythm and cardiac arrest happen immediately upon an object striking the chest directly over the heart at a very critical time during a heartbeat [5]. The name comes from the Latin phrase meaning "agitation of the heart." [5]
The object is usually something small and hard, like a baseball or hockey puck [5]. When it hits, the impulse from the object disrupts the normal heart rhythm and leads to sudden cardiac arrest.
Two terms in this condition are worth defining. Ventricular fibrillation is a chaotic, quivering rhythm of the heart's lower chambers — the ventricles — that makes the heart unable to pump blood effectively. Cardiac arrest is when the heart suddenly stops working properly, and blood stops flowing to the body and brain.
How Common Is Commotio Cordis?
Despite its rarity, it matters enormously on the sports field, because it is a known cause of sudden cardiac death in young people who play sports. It is one of the leading causes of sudden cardiac death in young athletes, ranked third in a 2023 review [2] [5].
What Are the Symptoms of Commotio Cordis?
Commotio cordis produces no warning signs at all before the event happens. The event itself unfolds in seconds. The signs include:
Symptom | What It Looks Like |
Immediate collapse | The person collapses right after being hit in the chest |
Ventricular fibrillation | The heart's lower chambers quiver instead of pumping |
Cardiac arrest | The heart suddenly stops working, and blood flow to the body stops |
Unconsciousness | The person loses consciousness immediately |
What Causes Commotio Cordis?
Getting hit at a 90-degree angle on the left side of the chest — directly over the heart — with a baseball or other small, hard sports equipment can cause commotio cordis [5]. Your heart sits on the left side of your chest. The blow could come from a baseball, lacrosse ball, or hockey puck coming straight at the chest at, for example, 40 mph or 50 mph [5].
The Timing Window
What makes commotio cordis so rare — and so cruel — is that the blow has to land at an exact instant. The blow can cause ventricular fibrillation and then sudden cardiac arrest if it arrives during the very short time when the lower heart chambers (ventricles) are relaxing after a contraction [3] [5]. The force of the blow makes the ventricles contract when they are supposed to be resting [5].
That is why a punch could theoretically cause commotio cordis: it would have to arrive at a 90-degree angle at 40 mph or more, and at just the right moment in the cardiac cycle [5].
Who Is Most at Risk?
Commotio cordis happens most often to people who play sports — especially those involving a baseball or another hard object, commonly a lacrosse ball, softball, or hockey puck [5].
Risk Factor | Detail |
Sport type | Sports involving a baseball or another hard object (commonly a lacrosse ball, softball, or hockey puck) |
Age | Younger than 20, with an average age of around 15 |
Sex | Male |
What Are the Complications?
Cardiac arrest from commotio cordis can be fatal. According to the National Commotio Cordis Registry, this condition has caused sudden death in more than 220 people since 1996, when the registry began [5].
How Is Commotio Cordis Diagnosed?
A healthcare provider may suspect commotio cordis if someone collapses after being hit on the left side of the chest with a hard, fast-moving baseball or hockey puck [5]. With this suspicion, they can run tests in a hospital after the person receives CPR and defibrillation.
Importantly, commotio cordis is a diagnosis of exclusion — the provider rules out more common causes of cardiac arrest before confirming it as the diagnosis [5]. A diagnosis of exclusion means doctors confirm a condition by proving that other, more common explanations do not fit.
Tests used to evaluate commotio cordis include:
Test | What It Does |
Electrocardiogram (EKG) | Records the heart's electrical rhythm |
Blood tests | Check for heart damage markers |
Echocardiogram | Ultrasound that images how the heart moves and pumps |
Heart MRI or CT scan | Detailed images of the heart's structure |
Heart catheterization | A tube is guided into the heart to check blood vessels and pressure |
How Is Commotio Cordis Treated?
A person with commotio cordis needs immediate medical attention for cardiac arrest. Ask someone to call 911 while you provide CPR. Emergency care should include the use of an automated external defibrillator (AED) — a portable device that delivers an electric shock to restore a normal rhythm [4] [5].
After emergency treatment, the person should have a complete evaluation for undiagnosed heart issues [5] [6]. Healthcare providers will admit the person to the hospital, where they are monitored. Imaging is used to check how well the heart functions [5].
Figure 1: Survival depends on the "chain" of rapid response: 911, CPR, an AED, then hospital monitoring, a full heart evaluation and, when needed, cooling therapy.
Therapeutic Hypothermia
Providers may use therapeutic hypothermia for adult survivors who cannot follow commands. This treatment helps the brain use oxygen more slowly and prevents swelling in the brain [5].
The process works like this: the provider sedates the patient and places a breathing tube before cooling them for at least 24 hours. A cooling machine, ice packs, cold IV fluids, and cooling blankets keep the body temperature steady between 89.6 and 96.8 degrees Fahrenheit (32 to 36 degrees Celsius) [5]. Afterward, the patient is rewarmed over several hours.
Therapeutic hypothermia can cause side effects, including pneumonia, sepsis, abnormal heart rhythms, and coagulopathy — a condition in which the blood is less able to form clots [5].
What's the Outlook for Commotio Cordis?
Survival odds have improved greatly over time as more people recognize the condition, provide CPR, and have AEDs available [1] [5]. Prompt treatment improves the chances of survival, which is about 59% [5] [6]. Those who do not receive CPR right away, or who have a congenital (present since birth) heart issue, are less likely to survive [5] [6].
After Recovery
If healthcare providers evaluate the survivor and do not find any heart issues, no further treatment is needed after recovery. However, if they find an undiagnosed congenital or genetic heart issue, treatment for that condition may be needed [5].
Returning to Sports
A survivor may be able to return to playing sports after a complete evaluation of the heart, which may include an EKG, echocardiogram, heart MRI or CT, and a stress test [5] [6]. A provider may not recommend playing sports again if heart issues are found. There is also a small risk of commotio cordis happening again, so a survivor may need to avoid sports that could damage the chest [5].
How Can I Lower the Risk of Commotio Cordis?
Although protective gear hasn't prevented commotio cordis completely, it may provide some protection [5]. Sports teams can use baseballs that are safer for younger athletes [5] [6].
Most importantly, coaches and other staff can get training on how to recognize commotio cordis when it happens and how to do CPR when it does [5] [6]. They can also make sure their sports venues have functional and accessible AEDs [5] [6]. A well-planned and rehearsed emergency action plan (EAP) is vital for prompt treatment.
When Should I Go to the ER?
If you have a heart condition, you may need emergency care again at some point. Someone nearby should call 911 if you experience chest pain, heart palpitations (a racing, fluttering, or pounding heartbeat), shortness of breath, lightheadedness, or passing out [5].
What is the bottom line on commotio cordis?
Commotio cordis is a rare but devastating event: a blow to the chest from a small, hard object like a baseball or hockey puck strikes at the exact instant the heart's lower chambers are relaxing, triggers a chaotic rhythm, and stops the heart. It claims more than 220 lives since 1996 and strikes young male athletes around age 15 most often [1] [5]. The single greatest factor in survival is speed — 911, CPR, and an AED used immediately raise the odds of survival to about 59% [1] [5]. Afterward, a complete heart evaluation determines whether further treatment is needed and whether a return to sports is safe. The best protection for youth sports is preparation: CPR-trained coaches, working AEDs on the sidelines, a rehearsed emergency action plan, protective equipment, and safer balls for younger players.
A Reassuring Note
Commotio cordis is frightening to think about, but it is extremely rare — fewer than 30 cases each year — and the odds of survival are higher than ever today. With prompt medical attention, many people can recover fully and return to the sports they love. CPR training and AED availability at sports venues give families and coaches real peace of mind.
Emergency Alert
If someone collapses after a blow to the chest, do not wait. Call 911 immediately, begin CPR, and use an AED as soon as one is available. Every second counts — the difference between life and death in commotio cordis is how fast the heart can be restarted.
What should you do about commotio cordis?
Protect your young athletes with preparation. CPR training and AED availability at your sports venue could save a life. For more plain-English health guides, visit Rinnit.com.
Frequently Asked Questions
What does commotio cordis mean?
The Latin phrase means "agitation of the heart." It describes a condition in which a blow to the chest triggers an abnormal heart rhythm and sudden cardiac arrest.
What is commotio cordis?
A condition in which ventricular fibrillation and cardiac arrest happen immediately when an object — usually something small and hard like a baseball or hockey puck — strikes the chest directly over the heart at a very critical time during a heartbeat.
How rare is commotio cordis?
Commotio cordis is extremely rare. There are fewer than 30 cases each year.
What causes the heart to stop in commotio cordis?
The blow lands during the very short window when the ventricles (the lower heart chambers) are relaxing after a contraction. The force makes the ventricles contract when they are supposed to be resting, triggering ventricular fibrillation and cardiac arrest.
What is ventricular fibrillation?
An abnormal heart rhythm in which the heart's lower chambers quiver instead of pumping normally.
What are the symptoms of commotio cordis?
Immediate collapse after being hit in the chest, ventricular fibrillation, cardiac arrest, and unconsciousness.
Can a punch cause commotio cordis?
Yes, a punch can cause it — but it would have to arrive at a 90-degree angle at 40 mph or more, and at exactly the right moment in the cardiac cycle.
How fast does the object need to be traveling?
Objects have been documented coming straight at the chest at about 40 to 50 mph, such as a baseball, lacrosse ball, or hockey puck.
Where on the chest does the blow have to land?
On the left side of the chest, directly over the heart, at a 90-degree angle. The heart sits on the left side of the chest.
Who is most at risk of commotio cordis?
People who play sports involving a baseball or another hard object (commonly a lacrosse ball, softball, or hockey puck), who are younger than 20 with an average age of around 15, and who are male.
Is commotio cordis a leading cause of sudden death in young athletes?
Yes. It is one of the leading causes of sudden cardiac death in young athletes; a 2023 review ranked it third.
How many people have died from commotio cordis?
According to the National Commotio Cordis Registry, the condition has caused sudden death in more than 220 people since 1996, when the registry began.
Can you survive commotio cordis?
Yes. Survival is possible if the person receives CPR and defibrillation right away.
What is the survival rate?
Prompt treatment improves survival to about 59%. People who do not receive CPR right away, or who have an undiagnosed congenital heart issue, are less likely to survive.
What should bystanders do first?
Ask someone to call 911 while providing CPR, and use an automated external defibrillator (AED) immediately.
What is an AED?
An automated external defibrillator is a portable device that analyzes the heart's rhythm and delivers an electric shock to restore a normal beat.
How is commotio cordis diagnosed?
A provider suspects it when someone collapses after being hit on the left side of the chest with a hard, fast-moving object. Because it is a diagnosis of exclusion, more common causes of cardiac arrest are ruled out first.
What is a diagnosis of exclusion?
A condition confirmed only after doctors rule out other, more common explanations. For commotio cordis, providers exclude more common causes of cardiac arrest before confirming the diagnosis.
What tests are run after commotio cordis?
An EKG, blood tests, an echocardiogram, a heart MRI or CT scan, and sometimes heart catheterization.
What is therapeutic hypothermia?
A treatment for adult survivors who cannot follow commands that cools the body for 12 to 24 hours to help the brain use oxygen more slowly and prevent brain swelling.
How is therapeutic hypothermia performed?
The patient is sedated and given a breathing tube. A cooling machine, ice packs, cold IV fluids, and cooling blankets keep the body at 89.6 to 93.2 degrees Fahrenheit (32 to 34 degrees Celsius) for 12 to 24 hours, followed by gradual rewarming.
What are the side effects of therapeutic hypothermia?
Pneumonia, sepsis, abnormal heart rhythms, and coagulopathy (blood that is less able to form clots).
Will I need treatment after recovering from commotio cordis?
If a complete heart evaluation finds no heart issues, no further treatment is needed. If an undiagnosed congenital or genetic heart issue is found, treatment for that condition may be needed.
When can I return to sports after commotio cordis?
After a complete heart evaluation that may include an EKG, echocardiogram, heart MRI or CT, and a stress test.
Will I be allowed to play contact sports again?
A provider may not recommend sports if heart issues are found. There is also a small risk of recurrence, so sports that could damage the chest may need to be avoided.
Can commotio cordis happen again?
There is a small risk of it happening again.
Does protective gear prevent commotio cordis?
Protective gear hasn't prevented it completely, but it may provide some protection.
What other prevention steps help?
Using baseballs that are safer for younger athletes, training coaches and staff to recognize commotio cordis and perform CPR, and keeping functional, accessible AEDs at sports venues.
What is an emergency action plan (EAP)?
A well-planned and rehearsed set of steps for responding to a medical emergency at a sports venue. It is vital for prompt treatment of commotio cordis.
Should survivors see a doctor regularly after recovery?
Yes. Even without a heart condition, seeing a provider every year for a checkup is recommended. If a heart condition exists, emergency care may be needed again at some point.
When should I call 911 after recovering?
Someone nearby should call 911 if you experience chest pain, heart palpitations, shortness of breath, lightheadedness, or passing out.
Why have survival odds improved?
More people recognize the condition, more bystanders provide CPR, and AEDs are more widely available.
What questions should I ask my doctor?
Whether you have any heart issues that require care, whether you can play contact sports again, and how to protect yourself from another chest injury.
Related Reading
References
Maron BJ, et al. Increasing survival rate from commotio cordis. Heart Rhythm. 2013;10(2):219-223. PMID 23107651. https://doi.org/10.1016/j.hrthm.2012.10.034
Peng T, et al. Commotio Cordis in 2023. Sports Med. 2023;53(8):1527-1536. PMID 37382827. https://doi.org/10.1007/s40279-023-01873-6
Link MS. Pathophysiology, prevention, and treatment of commotio cordis. Curr Cardiol Rep. 2014;16(6):495. PMID 24760424. https://doi.org/10.1007/s11886-014-0495-2
Melo L, et al. Commotio Cordis: A Comprehensive Review. Cardiol Rev. 2025;33(3):256-259. PMID 37729588. https://doi.org/10.1097/CRD.0000000000000611
Cleveland Clinic. Commotio Cordis: Causes, Symptoms & Treatment. Cleveland Clinic. Last updated January 5, 2023. https://my.clevelandclinic.org/health/diseases/24572-commotio-cordis
Tainter CR, et al. Commotio Cordis. In: StatPearls. Treasure Island (FL): StatPearls Publishing; February 5, 2023. PMID 30252270. https://www.ncbi.nlm.nih.gov/books/NBK526014/
Medical Disclaimer
This article is for general informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition or a sports emergency. Never disregard professional medical advice or delay seeking it because of something you have read here. In a cardiac emergency, call 911 immediately and begin CPR.
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