happens in young people as well.
https://www.healthychildren.org/Engl...iac-Death.aspx
What causes sudden cardiac arrest in young people?
Not all causes of sudden cardiac arrest in children and young adults is known, but may include:
Hypertrophic cardiomyopathy. Usually inherited and often undiagnosed, this is the most common cardiovascular cause of SCA in young people. Muscle cells in the heart's lower chambers, called ventricles, thicken. This can cause abnormal heart rhythm, especially during exercise. Other types of pediatric cardiomyopathy may also play a role.
Coronary artery abnormalities. Defects in the way the coronary arteries connect to the heart can lead to decreased blood supply to heart muscle during exercise and cause cardiac arrest. Young people with coronary artery abnormalities usually are born with them but may not notice any symptoms until they are older.
Primary arrhythmias. In people with structurally normal hearts, sudden cardiac arrest can sometimes be caused by undiagnosed genetic conditions that affect the heart's electrical impulses. For example, these include:
Long QT syndrome. A heart rhythm condition that can cause fast and chaotic heart rhythm.
Wolff-Parkinson-White syndrome. An extra electrical pathway in the heart creates a detour that can make it pump very fast.
Arrhythmogenic right ventricular dysplasia (ARVD). With this inherited condition, some of the heart's muscle tissue gets replaced with scar tissue.
Myocarditis. Usually triggered by an infection, myocarditis means the walls of the heart are inflamed. Most myocarditis cases in children happen when a virus such as an enterovirus gets into the heart. It can also be caused by bacterial, fungal or parasite infections, and allergic reactions to some medications.
Marfan syndrome. This connective tissue disease can lead to tears in the heart's aortic blood vessel. People born with the condition, who tend to be tall and have long arms, may not realize they have it.
Commotio Cordis is caused by a blow to the chest directly over the heart at certain points in the heartbeat cycle. It can happen in kids with completely normal hearts. Commotio cordis is more common in sports with projective objects such as baseball, ice hockey and lacrosse.