Sudden Death in Athletes

What can be done to prevent tragedies

Sudden death in young athletes is not frequent but there are still many high-profile tragedies occurring every year. The most common cause of sudden death (a death within one hour of the onset of symptoms) in normal population is coronary artery disease. In coronary atherosclerosis, a sudden rupture of a plaque can lead to accumulation of platelets and the resulting blood clot may completely occlude the diseased coronary artery leading to a heart attack. This may cause dangerous heart rhythm disturbances including ventricular fibrillation (uncoordinated contraction of the heart with no cardiac output) and death.

In athletes, the most common cardiac congenital anomaly is hypertrophic cardiomyopathy - abnormal thickening of the walls of heart muscle - which is responsible for about 50% of sudden deaths in people under 35. Other possible causes of sudden death in young people are congenital abnormalities of coronary arteries (blood vessels that feed the heart muscle), myocarditis (inflammation of the heart muscle), arrhythmogenic right ventricular cardiomyopathy (ARVC, disease of the muscle of the right ventricle leading to heart failure and arrhythmias), dilated cardiomyopathy (enlarged and weakened heart), aortic stenosis (stiff and rigid aortic valve), and channelopathies (disturbance in the function of ion channels in membranes of heart muscle cells, such as LQTS - long QT syndrome, Brugada syndrome and catecholaminergic polymorphic ventricular tachycardia - CPVT).

Studies have shown that most of the athletes, who experienced sudden death, have never had any cardiac symptoms. Only in 25% of those athletes, some kind of cardiovascular disease is suspected or diagnosed before death. A degree of controversy exists over what level of screening is appropriate before engaging in competitive sports. Routine clinical tests include physical examination, ECG, echocardiogram and ergometry (treadmill test). Early indicators that can suggest the existence of hidden cardiovascular disorders are episodes of unexplained chest pain, prolonged palpitations, blackouts, presence of murmurs on investigation, abnormal ECG and history of sudden death in the family. Athletes with these signs and symptoms require thorough cardiovascular examination and testing.

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