Safe: Yes, you should be concerned. You are 50 yrs of age with "chest heaviness" and a fast heart rate (tachycardia). So, you have 3 choices: call your physician sooner rather than later (today or now), go to the closest emergency room, or, frankly, the 3rd choice doesn't really matter.
Answered 7/28/2014
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A doctor has provided 1 answer
A doctor has provided 1 answer
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