Heart Attack Self Care (Do You Know If This Works?)

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I read earlier that if you are having a heart attack and are alone with no one to give you critical care, you should force yourself to cough (and breathe deeply) to get oxygen until help arrives or you can get to a hospital. Does anyone know if this actually works? I ask because there's so much questionable advice floating around the Internet these days. Sometimes it's hard to know what's viable and what's nonsense.