The leading cause of sudden cardiac death in the United States is:

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Coronary artery disease is the most common cause of sudden cardiac death, accounting for approximately 80% of cases. It is caused by a blockage in one or more of the arteries supplying blood to the heart muscle, leading to a heart attack and potentially lethal cardiac arrhythmias. Hypertension, ischemic heart disease, heart valve disease, congestive heart failure, and cardiac arrhythmias can all contribute to sudden cardiac death, but are less common causes than coronary artery disease.

The Leading Cause of Sudden Cardiac Death in the United