If you suspect someone is having a heart attack, it is important to act quickly and provide first aid. Here are the steps to follow: 1. Call emergency services: Dial the emergency number in your country (such as 1066 Apollo / 108 Government ambulance in Tamil Nadu ) immediately. Inform them that you suspect a heart attack and provide the location. 2. Stay with the person: Do not leave the person alone unless you have to call for help. Reassure them and keep them calm. 3. Help the person sit down: If the person is conscious, help them sit in a comfortable position. Loosen any tight clothing, such as a tie or belt, to ease breathing. 4. Administer aspirin, if available: If the person is not allergic to aspirin and is able to swallow, provide them with a full dose (usually 325 mg). Aspirin can help reduce the damage caused by a heart attack. 5. Perform CPR if necessary: If the person becomes unresponsive and stops breathing, you may need to perform CPR (cardiopulmonary resuscitation). Push hard and fast on the center of the person's chest, aiming for a rate of 100-120 compressions per minute. If you are not trained in CPR, the emergency operator can guide you through the process. 6. Use an automated external defibrillator (AED): If an AED is available, follow the instructions provided with the device. AEDs are designed to deliver an electric shock to restore normal heart rhythm. Remember, these steps are not a substitute for professional medical care. It is crucial to seek medical attention as soon as possible for someone experiencing a heart attack.