Incidence of sudden cardiac arrest and death in young athletes and military members: A systematic review and meta-analysis. Incidence of sudden cardiac death in the young: A systematic review. National Heart, Lung, and Blood Institute. Overview of sudden cardiac arrest and sudden cardiac death. Some people are born with changes in the heart and blood vessels that can reduce blood flow and lead to sudden cardiac death. Heart structure problem present at birth (congenital heart defect).The blow to the chest can trigger ventricular fibrillation if it strikes at a specific time in the signaling cycle. Instead, it changes the heart's electrical signaling. This condition doesn't damage the heart muscle. Commotio cordis may occur in athletes who are hit hard in the chest by sports equipment or by another player. A hard hit to the chest that causes sudden cardiac death is called commotio cordis. Other heart rhythm disorders that can cause sudden cardiac death include Brugada syndrome and Wolfe-Parkinson-White syndrome. Long QT syndrome may be present at birth (congenital long QT syndrome) or caused by an underlying medical condition or medication (acquired long QT syndrome). It's linked to unexplained fainting and sudden death, especially in young people. Long QT syndrome is a heart rhythm condition that can cause fast, chaotic heartbeats. The thickening makes it hard for the heart to pump blood and can cause fast heartbeats. The most common cause of sudden cardiac death in young people is this genetic condition that causes the heart muscle to grow too thick.
Thickened heart muscle (hypertrophic cardiomyopathy).
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