If you are having a heart attack, try to emit a loud and forceful cough. It should be strong and deep. In fact try to repeat it coughing at least for 2 seconds after which you need to exhale, while exhale and extend it to last a considerable length of time. When you cough during a heart attack, you force the blood to flow back into your heart. Blood circulation is resumed for the heart to resume its normalcy. The pressure of coughing restores the balance of your heartbeat and rhythm preventing any further organ damage.
For a clearer picture follow the instructions in the video. This will definitely save your life one day. The best way to avoid instead of survive a heart attack is proper nutrition, exercise, avoid smoking and a healthy lifestyle free from stress.