Hidden killer for young athletes
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Sudden cardiac arrest, a leading killer of young athletes, typically results from a congenital abnormality, with the heart unable to cope with extreme exertion, or can also be caused by a blow to the chest
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Athletes should be monitored to detect any abnormality such as arrhythmic heart
beat

Superior vena cava
Aorta
Pulmonary valve
Right atrium 
Atrio- ventricular valve
Right ventricle
Pulmonary artery
Pulmonary veins
Left atrium
Left ventricle

NORMAL RHYTHM
1 Atria contract
Blood pumped into ventricles
2 Ventricles contract
Blood pumped into body
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MALFUNCTION: Unlike myocardial infarction, when blockage slows or stops blood flow, sudden cardiac arrest occurs when heart muscles begin to twitch spasmodically – ventricular fibrillation
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COMMOTIO CORDIS: VF can also be caused by impact on sternum during 30 millisecond window in cardiac cycle.
Immediate electrical defibrillation is required
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Source: American Heart Association
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