A heart attack and cardiac arrest are different medical emergencies. A heart attack occurs when blood flow to part of the heart muscle is blocked, while cardiac arrest happens when the heart suddenly stops pumping blood effectively due to an electrical problem. A heart attack may sometimes trigger cardiac arrest, so recognizing warning signs is important. Chest pain, shortness of breath, sweating, or sudden weakness should never be ignored. Cardiac arrest requires immediate emergency response and CPR. Seeking urgent medical attention and choosing a best cardiology hospital in Chennai for heart-related concerns can support timely diagnosis, treatment, and ongoing cardiac care.