Health experts are urging the public to know what to do in the event of a heart attack, a life-threatening emergency that requires immediate action. With cardiovascular disease remaining the world’s leading cause of death, understanding how to respond quickly and effectively during a heart attack could mean the difference between life and death. Medical professionals say the most important thing is not to panic. Recognizing the symptoms early and acting fast is critical. A heart attack occurs when blood flow to the heart muscle is severely reduced or blocked, usually due to a buildup of fat, cholesterol, and other substances. Here are five essential steps recommended by cardiologists and emergency responders: 1. Call emergency services immediately. If you or...