Will I die if I get my heart rate up to 300?

Whenever I jog lightly for 30 minutes my heart rate gets up to 180. I can only imagine what it would be like if I ran fast which is something I can do f I conditioned myself to. I used to be able to maintain a somewhat fast pace for awhile but I stopped running. Years after I stopped running I developed some heart... show more Whenever I jog lightly for 30 minutes my heart rate gets up to 180. I can only imagine what it would be like if I ran fast which is something I can do f I conditioned myself to. I used to be able to maintain a somewhat fast pace for awhile but I stopped running. Years after I stopped running I developed some heart condition where I can't exercise moderately without my heart rate getting to 200 and I'm not even tired and I get palpitations sometimes. If I try to run at a fast pace I can imagine it getting to 300 because at slower pace it's 180. Can I die if I run faster and it gets to 300?
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