I'm seeing a lot of this being posted and re-posted on facebook. The original poster appears to be a chiropractor with homeopathic training (the post is public and can be found by scrolling down on his page). The claim is that you can keep your heart beating for a while by inhaling and then coughing, if you happen to have a heart attack. Here is the original post:
HOW TO SURVIVE A HEART ATTACK WHEN YOU ARE ALONE??
Since many people are alone when they suffer a heart attack, without help,the person whose heart is beating improperly and who begins to feel faint, has only about 10 seconds left before losing consciousness.
However,these victims can help themselves by coughing repeatedly and very vigorously. A deep breath should be taken before each cough, and the cough must be deep and prolonged, as when producing sputum from deep inside the chest.
A breath and a cough must be repeated about every two seconds without let-up until help arrives, or until the heart is felt to be beating normally again.
Deep breaths get oxygen into the lungs and coughing movements squeeze the heart and keep the blood circulating. The squeezing pressure on the heart also helps it regain normal rhythm. In this way, heart attack victims can get to a hospital. Tell as many other people as possible about this. It could save their lives!!
The source itself is certanly unreputable enough for me to not take it seriously, but still, I'm left wondering whether there is actually any truth to the claim that coughing helps the heart to continue beating.