A myocardial infarction, commonly known as a heart attack, is a condition where blood-flow to the heart is blocked, often by a clot. As the heart receives less blood, it is unable to pump, and the heart begins to die. A person having a heart attack should lie down and call their country's emergency services number (e.g. 911 in the U.S.), and then take steps to alleviate the heart attack.
A person alone should remain on the line with the emergency operator; heart attacks don't often kill a person instantly, but get worse over time. Chewing an aspirin pill may help, as the aspirin thins the blood and may help more blood get past the blockage. A person with a history of heart trouble may have nitroglycerin pills on hand; the proper dose (as indicated by a doctor) should be taken while waiting for an ambulance.
If a person suffering a heart attack is with others, they should place him on the floor with his legs slightly elevated. If the person is unconscious or not breathing, cardiopulmonary resuscitation should be started immediately; compress the center of the chest one hundred times per minute until help arrives. Mouth-to-mouth is no longer required for CPR to be effective.
In all cases, the most important step is to notify emergency services. There are few first aid steps an untrained individual can take to ensure recovery from a heart attack.
Most victims of heart attack die within 2-3 hours followed by their heart attack. There is a range of survival chance for them if they were reached to the hospital immediately and the doctors recognised the symptoms of the attack. They may be helped by comforting them and providing them with aspirin to chew. Lie them on their back if they have lost conscious so, and check whether their airways is blocked, possibly by toungue. Make sure they are breathing and avoid inturruptions. Calling for an embulance would be the best idea. Do so.
If someone collapses, the first thing you should do is to call for help. Then you perform something called AB-CAB
AB, is that you bend over and try to feel if the patient is breathing, if he is then you wait, however, if he is not you have to perform the C.A.B part.
C stands for Chest Compression. You do a set of 30 with a rather fast rhythm.
A and B stand for airway open and you do rescue breaths, two, then you do the C part again, the AB, then C, etc.. Until medical care arrives.
However, you should try and let someone who is an emergency responder do all these steps or you should consider getting the test yourself, it is basic and helpful.
Hope I helped!