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Most deaths due to cardiac arrest are in older adults, particularly those with coronary artery disease. Cardiac arrest is the leading cause of death in young athletes, but the incidence of it is unclear. Perhaps 1 in every 50,000 sudden cardiac deaths a year occurs in young athletes.
The immediate cause of most sudden cardiac arrests is an abnormal heart rhythm. The heartâs electrical activity becomes chaotic, and it canât pump blood to the rest of the body. Conditions that can trigger sudden cardiac arrest include: Coronary artery disease . This is the most common cause of sudden cardiac arrest in people older than 35. Cardiomyopathy . When you have this condition, your heart muscle becomes enlarged or thick, so it's weakened.