Don't try this at home folks.
If you are having a heart attack (myocardial infarction) then the effort of coughing may actually speed up your demise by placing extra effort on the heart.
Coughing can also stimulate the vagus nerve which will slow your heart down, which in some cases will cause you to pass out. If you already are having a problem with a slow heart rate (bradycardia) caused by a myocardial infarction then you will definetly speed up your demise.
Alternately taking really deep breaths can cause a rise in interthoracic pressure, which can restrict the return of blood to the heart.
If you are having a cardiac arrest then I defy anyone to start coughing, cardiac arrest = heart stopped beating, although there may be some electrical activity still present, you will be unresponsive.
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