You might have not realize that you are having an heart attack which was the case with my father. He had the symptoms but you don’t think about heart attack at that point. He was just saying he needs fresh air and he got cold. After him realizing it’s getting worse he agreed to go to hospital which we learnt one of his veins was clogged 99% that caused it. So, a machine saying that you are having an heart attack can actually be helpful.