What is the most common cause of cardiac arrest in adults?

The most prevalent cause of cardiac arrest in adults is coronary artery disease (CAD). CAD is a condition that occurs due to the narrowing or blocking of the coronary arteries, which supply oxygen-rich blood to the heart. When these arteries become narrowed or blocked, the heart muscle is deprived of oxygen and nutrients, leading to myocardial ischemia and eventually cardiac arrest. CAD is often caused by atherosclerosis, a condition characterized by the buildup of plaque in the arteries.